The Phase Change Lab: Freezing and Melting of Water
|
|
|
- Kelley Banks
- 6 years ago
- Views:
Transcription
1 The Phase Change Lab: Freezing and Melting of Water Experiment 3 Freezing temperature is the temperature at which a substance turns from a liquid to a solid. Melting temperature is the temperature at which a substance turns from a solid to a liquid. Freezing temperature and melting temperature are characteristic properties. In this experiment, you will determine and compare the freezing and melting temperatures of water. OBJECTIVES In this experiment, you will use a computer to measure temperature analyze graphs of your data to determine the freezing and melting temperatures of water determine the relationship between the freezing and melting temperatures of water analyze a graph of temperature versus time for a substance undergoing a change of temperature and a change of phase. apply the concepts studied in a new situation MATERIALS computer Go!Link adapter Logger Pro software Vernier Temperature Probe ring stand utility clamp one test tube 400-mL beaker water 10-mL graduated cylinder ice salt spoon Figure 1 Physical Science with Computers 3-1
2 Experiment 3 PROCEDURE Part I Freezing 1. Turn on your computer. Select Physics to login. 2. Connect the temperature probe to a Go!Link adapter. Connect the Go!Link/tempererature probe set-up to the computer s USB port. 3. Open LoggerPro by selecting the LoggerPro icon from the dock (it has a red diamond background with a caliper in front of it). 4. Go to the File menu and select open. Prepare the computer for data collection by opening the file named 03 Freeze Melt Water.cmbl (it is located in the folder Physical Science with Computers). When the file opens, the vertical axis will have temperature scaled from 20 to 30 C. The horizontal axis will have time scaled from 0 to 15 minutes. 5. Put about 100 ml of snow (or crushed ice) into a 400-mL beaker. 6. To the snow, add 5 spoons of salt to the beaker and stir with a spoon. All of the salt should dissolve; you may need to add more salt. 7. Put 5 ml of water into a test tube and use a utility clamp to fasten the test tube to a ring stand. The test tube should be clamped above the snow bath. Place the Temperature Probe into the water inside the test tube. 8. When everything is ready, click the Collect button to begin data collection. Then lower the test tube into the snow bath. 9. Throughout the entire 15 minutes, make and record observations. A data table is provided. 10. Slightly, but continuously, move the probe during the first 10 minutes of Part I. Be careful to keep the probe in, and not above, the ice as it forms. When 10 minutes have gone by, stop moving the probe and allow it to freeze into the ice. Add more snow & salt to the snow bath as the original snow melts. 11. When 15 minutes have passed, data collection will stop. Keep the test tube submerged in the snow bath until Step On the displayed graph, analyze the flat part of the curve to determine the freezing temperature of water: Move the mouse pointer to the beginning of the graph s flat part (plateau). Press the mouse button and hold it down as you drag across the flat part to select it (only select the flat part). Click on the Statistics button,. The mean temperature value for the selected data is listed in the statistics box on the graph. Record this value as the freezing temperature in your data table. To remove the statistics box, click on the upper-right corner of the box. Part II Melting 13. Prepare the computer for data collection. From the Experiment menu, choose Store Latest Run. This stores the data so it can be used later. 14. Click the Collect button to begin data collection. Then raise the test tube and fasten it in a 3-2 Physical Science with Computers
3 Freezing and Melting of Water position above the snow bath. Do not move the Temperature Probe during Part II. 15. Throughout the entire 15 minutes, make and record observations. A data table is provided. 16. Obtain 250 ml of warm water in a clean beaker. When 12 minutes have passed, lower the test tube and its contents into this warm-water bath. 17. When 15 minutes have passed, data collection will stop. 18. On the newer displayed graph, analyze the flat part of the curve to determine the melting temperature of water: Move the mouse pointer to the beginning of the graph s flat part. Press the mouse button and hold it down as you drag across the flat part to select it. Click the Statistics button,. The mean temperature value for the selected data is listed in the statistics box on the graph. Record this value as the melting temperature in your data table. To remove the statistics box, click on the upper-right corner of the box. 19. Print a graph of temperature vs. time showing both data runs: Label both curves by choosing Text Annotation from the Insert menu, and typing Freezing Curve (or Melting Curve ) in the edit box. Then drag each box to a position on or near its respective curve. double-click on the title of the graph. Add the initials of each member of your lab group to the title of the graph. Go to the File menu and select Print Graph. Print copies of the graph for each member of your group. 20. Clean-up your lab station and return all equipment. Dispose of the salty ice water as directed by your teacher. Physical Science with Computers 3-3
4 Experiment 3 DATA Freezing temperature of water sample C Melting temperature of water sample C OBSERVATIONS TIME TEMPERATURE PHASES OF MATTER OBSERVATIONS PART #1 0 MIN 2 MIN 4 MIN 6 MIN 8 MIN 10 MIN 12 MIN 14 MIN 15 MIN PART #2 0 MIN 2 MIN 4 MIN 6 MIN 8 MIN 10 MIN 12 MIN 14 MIN 15 MIN PROCESSING THE DATA: ANSWER ALL QUESTIONS USING 3-4 Physical Science with Computers
5 COMPLETE SENTENCES. 1. What happened to the water temperature before the water started freezing? Freezing and Melting of Water 2. What happened to the water temperature during freezing? 3. What happened to the water temperature after all of the water was frozen? 4. What happened to the water temperature before the water started melting? 5. What happened to the water temperature during melting? 6. What happened to the water temperature after all of the ice was melted? 7. According to your data and graph, what is the freezing temperature of water? Physical Science with Computers 3-5
6 Experiment 3 8. According to your data and graph, what is the melting temperature of water? 9. How does the freezing temperature of water compare to its melting temperature? 10. How many phases of matter are present at the freezing temperature of water? What are they? 11. How many phases of matter are present at the melting temperature of water? What are they? ERROR 1. Calculate the percent error between your value for the freezing temperature of water and the accepted value for the freezing temperature of water. SHOW YOUR WORK. % error =[(theoretical-experimental)/theoretical] x Calculate the percent error between your value for the melting temperature of water and the accepted value for the melting temperature of water. SHOW YOUR WORK. % error =[(theoretical-experimental)/theoretical] x List (using complete sentences) at least three sources of error that may have affected your freezing temperature or your melting temperature. 3-6 Physical Science with Computers
7 Freezing and Melting of Water APPLICATION 1. Phenyl salicylate has a freezing temperature of 41.5 C. On the graph below, sketch and label a freezing curve for phenyl salicylate. Be sure to indicate the freezing temperature on the graph. 2. Using another color, draw a melting curve for phenyl salicylate on the same graph. Indicate the melting temperature on the curve. Temperature versus Time Graphs for Phenyl Salicylate Temperature ( C) Time (minutes) CONCLUSION: ON A SEPARATE SHEET OF PAPER, NEATLY HANDWRITE OR TYPE A THOROUGH CONCLUSION TO THIS LAB. Restate the objectives in your own words. Summarize the procedure in three to four sentences. Describe your graphs in detail. What happens to the temperature of water before, during, and after a phase change? Restate your freezing temperature data and your melting temperature data. Make an analysis of what your data means. How does your data relate to the objectives? Compare your data with the accepted values of 0 C. How good is your data? Identify at least three sources of error and how each would affect your results. State a one-sentence conclusion. Physical Science with Computers 3-7
8 Experiment 3 Name: Block: Date: / / The Phase Change Lab & Conclusion (2) On a separate sheet of paper, neatly handwrite or type a thorough conclusion to this lab. (2) Restate the objectives in your own words. (2) Summarize the procedure in three to four sentences. (4) Describe your graphs in detail. What happens to the temperature of water before, during, and after a phase change? (2) Restate your freezing temperature data and your melting temperature data. (3) Make an analysis of what your data means. How does your data relate to the objectives? Compare your data with the accepted values of 0 C. How good is your data? (3) Identify at least three sources of error and how each would affect your results. (2) State a one sentence conclusion. (4) Lab is complete with data and observations. (11) Lab processing questions are answered completely using sentences. (3) Error questions are complete and work is shown. (2) Application section of the lab is complete. TOTAL: / Physical Science with Computers
Lab: Phase Change. Introduction. Predict. Computer setup- Equipment setup- Name: Period: Date:
/16 Points Lab: Phase Change Introduction Every substance has a characteristic freezing point and melting point. As you might expect, the substance changes phase at each of these temperatures. A pure substance
Experiment 14 It s Snow Big Deal
Experiment 14 It s Snow Big Deal OUTCOMES After completing this experiment, the student should be able to: use computer-based data acquisition techniques to measure temperatures. draw appropriate conclusions
LABORATORY INVESTIGATION
LABORATORY INVESTIGATION Diffusion Through a Dialysis Membrane Transport of substances into and out of the cell is necessary in order to sustain life. Substances transported into the cell are used for
Endothermic and Exothermic Reactions
Endothermic and Exothermic Reactions Experiment 1 Many chemical reactions give off energy. Chemical reactions that release energy are called exothermic reactions. Some chemical reactions absorb energy
Titration of Acids and Bases
Exercise 3 Page 1 Illinois Central College CHEMISTRY 132 Titration of Acids and Bases Name: Equipment 1-25 ml burette 1-pH electrode 1-50 and 1-150 ml beaker 1-stir plate and stir bar 1-Vernier Interface
Empirical Gas Laws (Parts 1 and 2) Pressure-volume and pressure-temperature relationships in gases
Empirical Gas Laws (Parts 1 and 2) Pressure-volume and pressure-temperature relationships in gases Some of the earliest experiments in chemistry and physics involved the study of gases. The invention of
Lab 3: Determination of molar mass by freezing point depression
Chemistry 162 The following write-up may be inaccurate for the particular chemicals or equipment we are using. Be prepared to modify your materials/procedure sections when performing the exercise. Please
Acid Rain. Evaluation copy
Acid Rain Computer 22 In this experiment, you will observe the formation of four acids that occur in acid rain: carbonic acid, H 2 CO 3 nitrous acid, HNO 2 nitric acid, HNO 3 sulfurous acid, H 2 SO 3 Carbonic
Lab Activity H4 It s Snow Big Deal
Lab Activity H4 It s Snow Big Deal OUTCOMES After completing this lab activity, the student should be able to use computer-based data acquisition techniques to measure temperatures. draw appropriate conclusions
Lab 5 Enthalpy of Solution Formation
Chemistry 3202 Lab 5 Enthalpy of Solution Formation Page 1 of 9 Lab 5 Enthalpy of Solution Formation Introduction This lab activity will introduce you to the measurement of energy change associated with
MEASUREMENT: PART II
1 MEASUREMENT: PART II Copyright: Department of Chemistry, University of Idaho, Moscow, ID 83844-2343, 2013. INTRODUCTION Read and/or review Section 1.7 and Figure 7.5 in your textbook. The first part
DIFFUSION THROUGH MEMBRANES STANDARDS B C.4 INTRODUCTION
DIFFUSION THROUGH MEMBRANES STANDARDS 3.2.12.B.1 3.2.12.C.4 INTRODUCTION Westminster College Many aspects of the life of a cell depend on the fact that atoms and molecules have kinetic energy and are constantly
Determining the K sp of Calcium Hydroxide
Determining the K sp of Calcium Hydroxide (Titration Method) Computer 23 Calcium hydroxide is an ionic solid that is sparingly soluble in water. A saturated, aqueous, solution of Ca(OH) 2 is represented
Diffusion through Membranes. Evaluation copy. dialysis tubing, 2.5 cm 12 cm
Diffusion through Membranes Computer 3 Diffusion is a process that allows ions or molecules to move from where they are more concentrated to where they are less concentrated. This process accounts for
Determining the Concentration of a Solution: Beer s Law
Determining the Concentration of a Solution: Beer s Law Vernier Spectrometer 1 The primary objective of this experiment is to determine the concentration of an unknown copper (II) sulfate solution. You
Acid Rain. Computer OBJECTIVES
Acid Rain Computer 18 Acid rain is a topic of much concern in today s world. As carbon dioxide gas, CO 2, dissolves in water droplets of unpolluted air, the following reaction occurs: CO 2 + H 2 O H 2
Acid-Base Titration. Computer OBJECTIVES
Acid-Base Titration Computer 7 A titration is a process used to determine the volume of a solution that is needed to react with a given amount of another substance. In this experiment, your goal is to
Determining the Concentration of a Solution: Beer s Law. Evaluation copy. Figure 1
Determining the Concentration of a Solution: Beer s Law Computer 17 The primary objective of this experiment is to determine the concentration of an unknown copper (II) sulfate solution. You will use a
The Synthesis and Analysis of Aspirin
The Synthesis and Analysis of Aspirin Computer 22 Aspirin, the ubiquitous pain reliever, goes by the chemical name acetylsalicylic acid. One of the compounds used in the synthesis of aspirin is salicylic
THE IDENTIFICATION OF A SOLID ORGANIC ACID
THE IDENTIFICATIN F A SLID RGANIC ACID The volumetric procedure called a titration is a powerful tool in analytical chemistry. Not only does the process give the concentration of an unknown solution, but
Simple Harmonic Motion
Introduction Simple Harmonic Motion The simple harmonic oscillator (a mass oscillating on a spring) is the most important system in physics. There are several reasons behind this remarkable claim: Any
Acid-Base Titration. Evaluation copy
Acid-Base Titration Computer 7 A titration is a process used to determine the volume of a solution that is needed to react with a given amount of another substance. In this experiment, your goal is to
Evaluation copy. Acids and Bases. computer OBJECTIVES MATERIALS
Acids and Bases Computer 2 Organisms are often very sensitive to the effect of s and s in their environment. They need to maintain a stable internal ph in order to survive even in the event of environmental
Lab 5: Calculating an equilibrium constant
Chemistry 162 The following write-up is inaccurate for the particular chemicals we are using. Please have all sections up through and including the data tables ready before class on Wednesday, February
Lab 1 Uniform Motion - Graphing and Analyzing Motion
Lab 1 Uniform Motion - Graphing and Analyzing Motion Objectives: < To observe the distance-time relation for motion at constant velocity. < To make a straight line fit to the distance-time data. < To interpret
Simple Harmonic Motion
Physics Topics Simple Harmonic Motion If necessary, review the following topics and relevant textbook sections from Serway / Jewett Physics for Scientists and Engineers, 9th Ed. Hooke s Law (Serway, Sec.
Photosynthesis and Respiration
Computer 31C Plants make sugar, storing the energy of the sun into chemical energy, by the process of photosynthesis. When they require energy, they can tap the stored energy in sugar by a process called
Falling Objects. Experiment OBJECTIVES MATERIALS
Falling Objects Experiment 40 Galileo tried to prove that all falling objects accelerate downward at the same rate. Falling objects do accelerate downward at the same rate in a vacuum. Air resistance,
Standardizing a Solution of Sodium Hydroxide. Evaluation copy
Standardizing a Solution of Sodium Hydroxide Computer 6 It is often necessary to test a solution of unknown concentration with a solution of a known, precise concentration. The process of determining the
Evaluation copy. The Molar Mass of a Volatile Liquid. computer OBJECTIVES MATERIALS
The Molar Mass of a Volatile Liquid Computer 3 One of the properties that helps characterize a substance is its molar mass. If the substance in question is a volatile liquid, a common method to determine
Photosynthesis and Respiration. Evaluation copy
Photosynthesis and Respiration Computer 12C Plants make sugar, storing the energy of the sun into chemical energy, by the process of photosynthesis. When they require energy, they can tap the stored energy
Seasons and Angle of Insolation
Computer Seasons and Angle of Insolation 29 (Adapted from Exp 29 Seasons and Angle of Insolation from the Earth Science with Vernier lab manual.) Have you ever wondered why temperatures are cooler in the
Chemistry 3202 Lab 6 Hess s Law 1
Chemistry 3202 Lab 6 Hess s Law 1 Lab 6 Hess's Law Introduction Chemical and physical changes are always accompanied by a change in energy. Energy changes may be observed by detecting heat flow between
Acid-Base Titration. Sample
Acid-Base Titration Computer 7 A titration is a process used to determine the volume of a solution that is needed to react with a given amount of another substance. In this experiment, your goal is to
pka AND MOLAR MASS OF A WEAK ACID
Experiment 10 pka AND MOLAR MASS OF A WEAK ACID Adapted by the Chemistry Faculty of Eastern Michigan University from EQUL 305,written by Richard C. Bell, Lebanon Valley College, published by Chemical Education
Density of Aqueous Sodium Chloride Solutions
Experiment 3 Density of Aqueous Sodium Chloride Solutions Prepared by Ross S. Nord and Stephen E. Schullery, Eastern Michigan University PURPOSE Determine the concentration of an unknown sodium chloride
Determination of the Equivalent Weight and the K a or K b for a Weak Acid or Base
INTRODUCTION Determination of the Equivalent Weight and the K a or K b for a Weak Acid or Base Chemists frequently make use of the equivalent weight (eq. wt.) as the basis for volumetric calculations.
Density of Aqueous Sodium Chloride Solutions
Experiment 3 Density of Aqueous Sodium Chloride Solutions Prepared by Ross S. Nord and Stephen E. Schullery, Eastern Michigan University PURPOSE Determine the concentration of an unknown sodium chloride
Chemical Equilibrium: Finding a Constant, Kc
Chemical Equilibrium: Finding a Constant, Kc Experiment 20 The purpose of this lab is to experimentally determine the equilibrium constant, K c, for the following chemical reaction: Fe 3+ (aq) + SCN (aq)
Heat of Combustion: Magnesium. This equation can be obtained by combining equations (1), (2), and (3): (1) MgO(s) + 2 HCl(aq) MgCl 2 (aq) + H 2 O(l)
Heat of Combustion: Magnesium Computer 19 In Experiment 18, you learned about the additivity of reaction heats as you confirmed Hess s Law. In this experiment, you will use this principle as you determine
The Decomposition of Hydrogen Peroxide. Evaluation copy
The Decomposition of Hydrogen Peroxide Computer 12 The decomposition of hydrogen peroxide in aqueous solution proceeds very slowly. A bottle of 3% hydrogen peroxide sitting on a grocery store shelf is
Acids and Bases. Figure 1
DataQuest 9 Organisms are often very sensitive to the effect of s and s in their environment. They need to maintain a stable internal ph in order to survive even in the event of environmental changes.
Experiment C-15 Distillation - part 1
1 Experiment C-15 Distillation - part 1 Objectives To learn about the three classical phases of matter, phase changes, and heating and cooling curves. To investigate the technique of distillation and to
Rate Law Determination of the Crystal Violet Reaction. Evaluation copy
Rate Law Determination of the Crystal Violet Reaction Computer 30 In this experiment, you will observe the reaction between crystal violet and sodium hydroxide. One objective is to study the relationship
HESS S LAW: ADDITIVITY OF HEATS OF REACTION
HESS S LAW: ADDITIVITY OF HEATS OF REACTION LAB THC 1.COMP From Chemistry with Computers, Vernier Software & Technology, 2000 INTRODUCTION In this experiment, you will use a Styrofoam-cup calorimeter to
for a Weak Acid 1-ring stand stir plate and stir bar ph Probe ml burette 1-50 ml and ml beaker Drop counter ph 7.00 buffer 0.
Exercise 4 Page 1 Illinois Central College CHEMISTRY 132 Name: Determination of for a Weak Acid Equipment Objectives 1-ring stand stir plate and stir bar ph Probe 1-25.00 ml burette 1-50 ml and 1-250 ml
Experiment 2: THE DENSITY OF A SOLID UNKNOWN AND CALIBRATION WITH DATASTUDIO SOFTWARE
Experiment 2: THE DENSITY OF A SOLID UNKNOWN AND CALIBRATION WITH DATASTUDIO SOFTWARE Concepts: Density Equipment Calibration Approximate time required: 90 minutes for density 90 minutes for two thermometers
Name: Block: Date: Student Notes. OBJECTIVE Students will investigate the relationship between temperature and the change of the state of matter.
Name: Block: Date: LCPS Core Experience Heat Transfer Student Notes OBJECTIVE Students will investigate the relationship between temperature and the change of the state of matter. LINK 1. Particles in
Determining the Enthalpy of a Chemical Reaction
Determining the Enthalpy of a Chemical Reaction Computer 13 All chemical reactions involve an exchange of heat energy; therefore, it is tempting to plan to follow a reaction by measuring the enthalpy change
THE CONSERVATION OF ENERGY - PENDULUM -
THE CONSERVATION OF ENERGY - PENDULUM - Introduction The purpose of this experiment is to measure the potential energy and the kinetic energy of a mechanical system and to quantitatively compare the two
Using Conductivity to Find an Equivalence Point
Experiment 25 PRE LAB DISCUSSION In this experiment, you will monitor conductivity during the reaction between sulfuric acid, and barium hydroxide in order to determine the equivalence point. From this
Acid-Base Titration Curves Using a ph Meter
Acid-Base Titration Curves Using a ph Meter Introduction: In this experiment you will use a ph sensor to collect volume and ph data as you titrate two acids with sodium hydroxide. You will obtain titration
Conductivity of Ocean Water
Title: Conductivity of Ocean Water (Water Chemistry) Grade Levels: 6-8 Introduction: We all know that ocean water tastes salty because it contains many dissolved salts of different elements. These salts
Determination of an Equilibrium Constant
Last updated 1/29/2014 - GES Learning Objectives Students will be able to: Determine the numerical value of an equilibrium constant from measured concentrations of all reaction species. Use an absorption
1-50 ml beaker stirring rod 1-10 ml beaker 0.10 M NaOH (1 ml) calibrated plastic dropper (1 ml) 50 ml dispensing burette (for Crystal Violet)
Exercise 2 Page 1 Illinois Central College CHEMISTRY 132 Name: Kinetics, Part II. Equipment Objectives. 1-50 ml beaker stirring rod 1-10 ml beaker 0.10 M NaOH (1 ml) calibrated plastic dropper (1 ml) 1.5x10-5
Graphing Your Motion. Name Period Group
Graphing Your Motion Name Period Group Graphs made using a computer-interfaced motion detector can be used to study motion. A motion detector measures the distance to the nearest object in front of it
Conductometric Titration & Gravimetric Determination of a Precipitate
Conductometric Titration & Gravimetric Determination of a Precipitate Experiment 9 In this experiment, you will monitor conductivity during the reaction between sulfuric acid, H2SO4, and barium hydroxide,
TITRATION CURVES INTRODUCTION. Read and/or review Sections 4.10 and 16.7 in your textbook.
1 TITRATION CURVES Copyright: Department of Chemistry, University of Idaho, Moscow, ID 83844-2343. 2013. INTRODUCTION Read and/or review Sections 4.10 and 16.7 in your textbook. In an acid - base titration,
Name Date Period. 1. If drops of ACID are added to a ph buffer, then the ph of the buffer will [increase / decrease / stay the same].
![Name Date Period. 1. If drops of ACID are added to a ph buffer, then the ph of the buffer will [increase / decrease / stay the same].](/thumbs/89/98268119.jpg "Name Date Period. 1. If drops of ACID are added to a ph buffer, then the ph of the buffer will [increase / decrease / stay the same].")
Name Date Period ACIDS AND BASES Organisms are often very sensitive to the effect of s and s in their environment. They need to maintain a stable internal ph in order to survive even in the event of environmental
Chemistry with Mr. Faucher. Acid-Base Titration
Chemistry with Mr. Faucher Name Date Acid-Base Titration 24 A titration is a process used to determine the volume of a solution needed to react with a given amount of another substance. In this experiment,
MODULE Catalysis, Chemical Reactions, and Nanoparticles-An Instructional Module
MODULE Catalysis, Chemical Reactions, and Nanoparticles-An Instructional Module MODULE TOPIC: Catalysis, Chemical Reactions, and Nanoparticles RATIONALE: This module is developed to incorporate my summer
Evaluation copy. Ground Temperature Measurements. computer OBJECTIVES MATERIALS PRE-LAB QUESTIONS
Ground Temperature Measurements Computer P3 Throughout the daylight hours the sun heats up the air and the soil. Project 1 in this manual investigates the changes in air temperature during this process.
Chemical Equilibrium: Finding a Constant, Kc
Chemical Equilibrium: Finding a Constant, Kc Computer 20 The purpose of this lab is to experimentally determine the equilibrium constant, K c, for the following chemical reaction: Fe 3+ (aq) + SCN (aq)
Evaporation and Intermolecular Attractions
Name Partners: Evaporation and Intermolecular Attractions Experiment 1 In this experiment, Temperature Probes are placed in various liquids. Evaporation occurs when the probe is removed from the liquid
Cart on a Ramp. Evaluation Copy. Figure 1. Vernier Dynamics Track. Motion Detector Bracket
Cart on a Ramp Computer 3 This experiment uses an incline and a low-friction cart. If you give the cart a gentle push up the incline, the cart will roll upward, slow and stop, and then roll back down,
Transpiration. Evaluation copy
Transpiration Computer 9 Water is transported in plants, from the roots to the leaves, following a decreasing water potential gradient. Transpiration, or loss of water from the leaves, helps to create
Experiment 2: The Beer-Lambert Law for Thiocyanatoiron (III)
Chem 1B Dr. White 11 Experiment 2: The Beer-Lambert Law for Thiocyanatoiron (III) Objectives To use spectroscopy to relate the absorbance of a colored solution to its concentration. To prepare a Beer s
C q T q C T. Heat is absorbed by the system H > 0 endothermic Heat is released by the system H < 0 exothermic
PLEASE REORD ALL DATA DIRETLY INTO YOUR LAB NOTEBOOKS Introduction Heating a substance is one of the simplest processes carried out in the chemical laboratory, and is usually accompanied by a rise in the
Aspirin Lab By Maya Parks Partner: Ben Seufert 6/5/15, 6/8/15
Aspirin Lab By Maya Parks Partner: Ben Seufert 6/5/15, 6/8/15 Abstract: This lab was performed to synthesize acetyl salicylic acid or aspirin from a carboxylic acid and an alcohol. We had learned in class
Experiment #4. Molar Mass by Freezing Point Depression
Experiment #4. Molar Mass by Freezing Point Depression Introduction When a nonvolatile solute is dissolved in a solvent, the freezing point of the solution is lowered. This process is called Freezing Point
Investigation #2 TEMPERATURE VS. HEAT. Part I
Name: Investigation #2 Partner(s): TEMPERATURE VS. HEAT These investigations are designed to help you distinguish between two commonly confused concepts in introductory physics. These two concepts, temperature
Thermodynamics and the Solubility of Sodium Tetraborate Decahydrate
Thermodynamics and the Solubility of Sodium Tetraborate Decahydrate In this experiment you, as a class, will determine the solubility of sodium tetraborate decahydrate (Na 2 B 4 O 7 10 H 2 O or Na 2 [B
Kinetics of Crystal Violet Bleaching
Kinetics of Crystal Violet Bleaching Authors: V. C. Dew and J. M. McCormick* From Update March 12, 2013 with revisions Nov. 29, 2016 Introduction Chemists are always interested in whether a chemical reaction
Chemical Equilibrium: Finding a Constant, Kc
Lab12 Chemical Equilibrium: Finding a Constant, Kc The purpose of this lab is to experimentally determine the equilibrium constant, K c, for the following chemical reaction: Fe 3+ (aq) + SCN (aq) FeSCN
Experiment 17 It s A Gas and More!
Energy Energy Experiment 17 It s A Gas and More! OUTCOMES After completing this lab activity, the student should be able to: explain a simple method for distinguishing carbon dioxide gas from oxygen gas.
EXPERIMENT 4 ONE DIMENSIONAL MOTION
EXPERIMENT 4 ONE DIMENSIONAL MOTION INTRODUCTION This experiment explores the meaning of displacement; velocity, acceleration and the relationship that exist between them. An understanding of these concepts
Saltwater Conductivity: Trends of the Periodic Table
Saltwater Conductivity: Trends of the Periodic Table by Kirk and Jennifer Pepper Louisiana Curriculum Framework Content Strand: Physical Science, Science as Inquiry Grade Level 9-12 Objectives: The students
Experiment C-10 Titration of a Strong Acid and a Strong Base
1 Experiment C-10 Titration of a Strong Acid and a Strong Base Objectives To study the titration process. To follow changes in the ph during the titration process while adding a strong base to a strong
Microscale Acid-Base Titration
icroscale Acid-Base Titration Experiment 31 A titration is a process used to determine the volume of a solution needed to react with a given amount of another substance. In this experiment, you will titrate
Spectrophotometric Determination of pka of Phenol Red
Spectrophotometric Determination of pka of Phenol Red This experiment uses instrumentation to accomplish quantitative analysis. You will get far more experience in this during CH427 if you are a Chemistry
CHM201 General Chemistry and Laboratory I Laboratory 7 Thermochemistry and Hess s Law May 2, 2018
Purpose: CHM201 General Chemistry and Laboratory I Laboratory 7 Thermochemistry and Hess s Law May 2, 2018 In this laboratory, you will measure heat changes arising from chemical reactions. You will use
Microscale Acid-Base Titration
Microscale Acid-Base Titration Experiment 36 A titration is a process used to determine the volume of a solution needed to react with a given amount of another substance. In this experiment, you will titrate
Evaluation copy. Transpiration. Computer OBJECTIVES
Transpiration Computer 13 Water is transported in plants, from the roots to the leaves, following a decreasing water potential gradient. Transpiration, or loss of water from the leaves, helps to create
Acid-Base Titration Curves Using a ph Meter
Acid-Base Titration Curves Using a ph Meter Introduction: In this experiment you will use a ph sensor to collect volume and ph data as you titrate two acids with sodium hydroxide. You will obtain titration
RATE LAW DETERMINATION OF CRYSTAL VIOLET HYDROXYLATION
Rate Law Determination of Crystal Violet Hydroxylation Revised 5/22/12 RATE LAW DETERMINATION OF CRYSTAL VIOLET HYDROXYLATION Adapted from "Chemistry with Computers" Vernier Software, Portland OR, 1997
Determining the Concentration of a Solution: Beer s Law
Determining the Concentration of a Solution: Beer s Law LabQuest 11 The primary objective of this experiment is to determine the concentration of an unknown nickel (II) sulfate solution. You will be using
Measuring Enthalpy Changes and Gas Laws
Measuring Enthalpy Changes and Gas Laws PURPOSE A B To observe changes in enthalpy in chemical processes. To determine the relationship between the pressure and volume of a gas. GOALS To identify exothermic
Titration 3: NH 3 Titrated with HCl
Titration 3: NH 3 Titrated with HCl Titration 1: Base is NH 3, Brom Blue in the indicator 1. Obtain about 60 ml of the standardized ( 0.1 M) HCl solution. CAUTION: Avoid spilling it on your skin or clothing.
Lesson Plan: Stearic Acid
Lesson Plan: Stearic Acid Created by: In this lesson, students investigate how stearic acid undergoes a 2014 AACT Middle School phase change from solid to liquid and back from liquid to solid. Content
Static and Kinetic Friction
Experiment Static and Kinetic Friction Prelab Questions 1. Examine the Force vs. time graph and the Position vs. time graph below. The horizontal time scales are the same. In Region I, explain how an object
H 2 CO 3 (aq) HNO 2 (aq) + HNO 3 (aq)
ACID RAIN LAB ENV 1.PALM From Science with Handhelds, Vernier Software & Technology, 2002. INTRODUCTION In this experiment, you will observe the formation of four acids that occur in acid rain: carbonic
Acids and Bases. Figure 1. Logger Pro or graph paper
Acids and Bases LabQuest 3 Organisms are often very sensitive to the effect of s and s in their environment. They need to maintain a stable internal ph in order to survive even in the event of environmental
iworx Sample Lab Experiment GB-2: Membrane Permeability
Experiment GB-2: Membrane Permeability Exercise 1: Movement of Small Positive Ions Across a Membrane Aim: To determine if small, positively charged, hydrogen ions can move across a membrane from a region
Lab 12 Pressure-Temperature Relationship in Gases
Lab 12 Pressure-Temperature Relationship in Gases INTRODUCTION /PURPOSE/PLE LAB QUESTION Gases are made up of molecules that are in constant motion and exert pressure when they collide with the walls of
Motion on a linear air track
Motion on a linear air track Introduction During the early part of the 17 th century, Galileo experimentally examined the concept of acceleration. One of his goals was to learn more about freely falling
Ashes to Ashes: Using evaporation rate to identify an unknown liquid
Case File 11 Ashes to Ashes: Using evaporation rate to identify an unknown liquid Measure and compare the cooling rates of unknown liquids, and identify the probable arsonist. PROBABLE ARSON Investigator:
General Physics I Lab. M1 The Atwood Machine
Purpose General Physics I Lab In this experiment, you will learn the basic operation of computer interfacing and use it in an experimental study of Newton s second law. Equipment and components Science
Center of Mass. Evaluation copy
Center of Mass Experiment 19 INTRODUCTION In the most of the previous experiments you have examined the motion of a single object as it underwent a variety of motions. You learned that an object subject
Experiment 2: The Beer-Lambert Law for Thiocyanatoiron (III)
Chem 1B Saddleback College Dr. White 1 Experiment 2: The Beer-Lambert Law for Thiocyanatoiron (III) Objectives To use spectroscopy to relate the absorbance of a colored solution to its concentration. To
Thermal Energy and Temperature Lab. Experiment Question: How can the difference between thermal energy and temperature be experimentally observed?
Thermal Energy and Temperature Lab Name 7 th Grade PSI Grade / 20 Experiment Question: How can the difference between thermal energy and temperature be experimentally observed? Hypothesis Starters: 1.