Today is: Friday, October 21st
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1 Today is: Friday, October 21st 10/21/2016 #followyourdreamsfriday 1. What are some of your biggest goals in life? 2. Which of the following is an example of a chemical change? Why? Justify your answer. a. A bronze statue turns green in the air. b. A piece of chalk is crushed into a powder. c. A piece of metal is hammered until it is flat. d. Rock melts into magma. Science News: Ultimate Dog Tease You have been working so hard all week! So today s video is just for fun. No questions to answer. :) Agenda: Upset Stomach Lab Last Class: Copper (II) Sulfate Lab Next Class: Alien Juicebar Virtual Lab Learning Target: I can identify matter based on physical and chemical changes.
2 Answer to Warm Up Question #2: Which of the following is an example of a chemical change? a. A bronze statue turns green in the air. b. A piece of chalk is crushed into a powder. c. A piece of metal is hammered until it is flat. d. Rock melts into magma. Why?!
3 Answer to Warm Up Question #2: Which of the following is an example of a chemical change? a. A bronze statue turns green in the air. b. A piece of chalk is crushed into a powder. c. A piece of metal is hammered until it is flat. d. Rock melts into magma. Why?!
4 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 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: 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. I can define the following terms: 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.
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8 ions. ions. An acid is a substance that donates hydrogen A base is a substance that accepts hydrogen neutral. A substance that is neither acidic nor basic is The ph scale measures how acidic or basic a substance is. Stands for power of Hydrogen.
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11 Academic Lab Please get out a book and begin reading!
12 Separating Mixtures Lab
13 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 Mixture of Iron Filings, Salt, Pepper, Sand in a cup
14 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.
15 Academic Lab Physical vs. Chemical Change Lab hnpf60ym_prbmw-dl5ouera8121lweal 6OAs6Q/edit?usp=sharing
16 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.
17 SAFETY: Academic Lab Physical vs. Chemical Change Lab 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.
18 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
19 PROCEDURE: Academic Lab Physical vs. Chemical Change Lab 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 CaCl 2 and Na2CO3 solutions In a test tube, combine several drops each of the calcium chloride and sodium carbonate solutions.
20 Academic Lab Physical vs. Chemical Change Lab DATA: Activity Title Chemical or Physical Change Evidence Lighting a Match Lighting a match is a change because...
21 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?
22 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.
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