Today is: Monday, October 17th Get out your homework! 10/17/2016 #motivationmonday (This is Week 11 Warm Ups!) 1. It s a new quarter, which means a fresh start! What can you do to stay motivated this quarter? 2. How is sublimation different than vaporization, condensation, and melting? a. Vaporization, condensation, and melting all include a solid phase. b. Sublimation takes place at much higher temperatures than the other three. c. Sublimation generates its own heat energy. d. Sublimation does not include a liquid phase. Science News: Why is waking up so hard? https://safeshare.tv/x/ss5800037c03778 3. During which stage of sleep is it most difficult to wake up and why? Why shouldn t you hit the snooze button? 3 complete sentences! Learning Target: I can identify evidence of a chemical change. Agenda: Signs of a Chemical Reaction Last Class: Physical vs. Chemical Changes Next Class: Signs of a Chemical Reaction
Answer to Warm Up Question #2: How is sublimation different than vaporization, condensation, and melting? a. b. c. d. Vaporization, condensation, and melting all include a solid phase. Sublimation takes place at much higher temperatures than the other three. Sublimation generates its own heat energy. Sublimation does not include a liquid phase. Why?!
Answer to Warm Up Question #2: How is sublimation different than vaporization, condensation, and melting? a. b. c. d. Vaporization, condensation, and melting all include a solid phase. Sublimation takes place at much higher temperatures than the other three. Sublimation generates its own heat energy. Sublimation does not include a liquid phase. Why?!
Trade & Grade Homework https://drive.google.com/file/d/0bxe8-okx7xxt QXRPU1p5NDFLdjQ/view?usp=sharing https://drive.google.com/file/d/0bxe8-okx7xxt UUNoSUIzVGFjVVU/view?usp=sharing If you were absent, turn in both of these assignments when you return to school!
I am able to identify: matter based on physical/chemical properties, the evidence of a physical/chemical change and how the transfer of energy affects the physical/chemical properties of matter. 4 3 2 In addition to mastering level 3, I make in-depth inferences and applications that go beyond what was taught in class. I am able to classify: I can define the following terms: Physical properties (states, density, boiling point, melting point, solubility) Chemical properties (reactivity, ph, acid/base/neutral, oxidation) Physical Changes (i.e., phase change) Chemical Changes (i.e., color change, endothermic, exothermic, generation of a gas, precipitate) I am able to explain: how the transfer of energy can affect the physical/chemical properties of matter. 1 Physical property State (solid, liquid, gas) Density Boiling point Melting point Solubility Physical Change Phase change Chemical property Reactivity ph, acid, base, neutral oxidation (corrosion) Chemical reaction Color change Generation of gas Precipitate Endothermic reaction Exothermic reaction With help, I can perform at level 2.
Activity #24 Signs of a Chemical Reaction
Materials for Today 10mL of Vinegar (Acetic Acid) Baking Soda (Sodium Bicarbonate) in a cup Lab Scoop Test Tubes Test Tube Rack Test Tube Brush
Lab Sheet for Notes and Observations https://docs.google.com/document/d/1sekxsdk4007vyngfcdfijtp2mvzkyunh86xsheyfpxu/ edit?usp=sharing
Chemical Reactions Produce new substances by changing the way in which atoms are arranged. REACTANTS= substances used in a chemical reaction PRODUCTS= substances formed by chemical reaction
6 Signs of a Chemical Reaction 1. 2. 3. 4. 5. 6. Odor Change Formation of a Gas Endothermic Reaction Exothermic Reaction Formation of a Precipitate Color Change
6 Signs of a Chemical Reaction! 1. ODOR CHANGE Produces new smells as the reaction occurs Examples: Rotting, bad breath, body odor
Sign #2: Formation of a Gas Reactants: Baking Soda (Sodium Bicarbonate) and Vinegar (Acetic Acid) 5 ml of Vinegar in test tube 1 lab scoop of baking soda
6 Signs of a Chemical Reaction! FORMATION OF A GAS Bubbles often appear Fizzes A product gas is leaving the reaction mixture Examples: vinegar + baking soda = carbon dioxide
Sign #3: Endothermic Reaction Reactants: Citric Acid and Baking Soda (Sodium Bicarbonate) 10 ml Citric acid in test tube Take temperature Combine w/ 1 lab scoop of baking soda Swirl and observe temperature!
6 Signs of a Chemical Reaction! ENDOTHERMIC REACTION (temperature/energy change) Chemical bonds break Energy (heat) is absorbed from surroundings Substance seems cooler Examples: baking, cold packs, photosynthesis
Sign #4: Exothermic Reaction Reactants: Hydrogen Peroxide and Yeast 10 ml Hydrogen Peroxide in test tube Take temperature Combine w/ 1 lab scoop of yeast Swirl and observe temperature!
6 Signs of a Chemical Reaction! EXOTHERMIC REACTION (temperature/energy change) Chemical bonds are made Energy (heat) is released to surroundings Substance seems warmer Examples: fireworks, explosions, hand warmers
Sign #5: Color Change Reactants: Cabbage Juice and Vinegar; Cabbage Juice and Baking Soda Add 10 ml of cabbage juice to 2 test tubes Add 3 drops of vinegar to one test tube Add one lab scoop of baking soda to another
6 Signs of a Chemical Reaction! COLOR CHANGE Substances change color Color change is a product of two or more reactants Examples: Rust, leaves changing color, mold
Sign #6: Formation of a Precipitate Reactants: Ammonia and dissolved Epsom Salt
6 Signs of a Chemical Reaction! A PRECIPITATE IS FORMED A solid that forms when two liquids combine The solid particles are the product Examples: Kidney stones, pearls, cheese
Academic Lab Please get out a book and begin reading!
Separating Mixtures Lab
Separating Mixtures Lab Objective: Separate a mixture of salt, iron filings, pepper, and sand by each substance s physical properties. Procedure: You and your group will need to come up with a procedure to separate each part of the mixture (yes, it s possible!!) Think about what physical properties you could use to separate each substance! Materials: Funnel Coffee Filter Graduated Cylinder Spoon Beaker Magnet Paper plate Iron Filings Salt Pepper Sand
Exit ticket 1. What physical changes did you observe when you separated the mixture with your group? 2. How successful were you (on a scale of 1-10) in separating and recovering each of the four components? Justify your success based on your observations.
https://docs.google.com/document/d/1ntdgb hnpf60ym_prbmw-dl5ouera8121lweal 6OAs6Q/edit?usp=sharing Academic Lab Physical vs. Chemical Change Lab
Academic Lab Physical vs. Chemical Change Lab OBJECTIVE: To differentiate between chemical & physical changes. BACKGROUND: When a physical change occurs, only the form of the substance changes. Chemical changes, however, result in the formation of new substances with different properties. Some general signs of a chemical change include a change of color or odor, the formation of a precipitate (solid), the formation of a gas, and a change in heat or light. In this lab, you will perform different activities and, based on your observations, determine whether a chemical or physical change has taken place.
Academic Lab Physical vs. Chemical Change Lab SAFETY: Before lighting the match, tie back long hair and secure loose clothing. After extinguishing the match, thoroughly douse it with water before placing it in the designated waste beaker. Do not ingest any chemicals. Absolutely no goofing off.
Academic Lab Physical vs. Chemical Change Lab MATERIALS: Match Chalk Vinegar Water Sucrose Calcium Chloride Solution Sodium Carbonate Solution Mortar and Pestle Test Tubes Candle Foil Square Tongs
Academic Lab Physical vs. Chemical Change Lab PROCEDURE: Perform each of the following activities and carefully observe what happens. After each activity, complete your data table. Lighting a match Light a single match (refer to safety precautions listed above). Lighting a candle: Light a single candle. Observe the candle for 45 seconds. Heating Sucrose: Take a pinch of sugar and place it on the foil. Using the tongs, hold the foil over the candle for approximately 1 minute. Crushing chalk Use a mortar and pestle to crush a piece of chalk. Mixing crushed chalk with vinegar In a test tube, mix a small amount of the crushed chalk from Activity #2 with vinegar. Mixing crushed chalk with water In a test tube, mix a small amount of the crushed chalk from Activity #2 with water. Dissolving sucrose in water In a test tube, dissolve a small amount of sucrose in water. Mixing CaCl2 and Na2CO3 solutions In a test tube, combine several drops each of the calcium chloride and sodium carbonate solutions.
Academic Lab Physical vs. Chemical Change Lab DATA: Activity Title Lighting a Match Chemical or Physical Change Evidence Lighting a match is a change because...
Academic Lab Physical vs. Chemical Change Lab ANALYSIS: Directions: Look at each of the following situations and identify as CHEMICAL or PHYSICAL, then explain why. 1. A bridge is rusting WHY? 2. Ice cube melting WHY? 3. Mix baking soda and Vinegar WHY? 4. Cooking a hamburger WHY? 5. Solid Air Freshener WHY? 6. A pane of glass is shattered WHY?
Academic Lab Physical vs. Chemical Change Lab CONCLUSION: Explain what a chemical & physical change is and give examples of each. Your audience is third graders. Use complete sentences.