Objective 1: Describe that matter is neither created nor destroyed even though it may undergo change.
- Compare the total weight of an object to the weight of its individual parts after being disassembled. Matter
- Compare the weight of a specified quantity of matter before and after it undergoes melting or freezing.
- Investigate the results of the combined weights of a liquid and a solid after the solid has been dissolved and then recovered from the liquid (e.g., salt dissolved in water then water evaporated).
- Investigate chemical reactions in which the total weight of the materials before and after reaction is the same (e.g., cream and vinegar before and after mixing, borax and glue mixed to make a new substance).
- Colonial Reactions: Bread oven Wool Purchasing Tools and Ingredients Making Adobe Bricks Making Butter Making Candles Making a full loaf of Bread half loaf Making Soap Making Wool Yarn and Cloth
Objective 2: Evaluate evidence that indicates a physical change has occurred.
- Identify the physical properties of matter (e.g., hard, soft, solid, liquid, gas).
- Compare changes in substances that indicate a physical change has occurred. Dry Ice pt. 1 pt. 2
- Describe the appearance of a substance before and after a physical change.
Objective 3: Investigate evidence for changes in matter that occur during a chemical reaction.
- Identify observable evidence of a chemical reaction (e.g., color change, heat or light given off, heat absorbed, gas given off).Examples of chemical reactions
- Explain why the measured weight of a remaining product is less than its reactants when a gas is produced.
- Cite examples of chemical reactions in daily life. Making Goop
- Compare a physical change to a chemical change. Physical Chemical Change
- Hypothesize how changing one of the materials in a chemical reaction will change the results.