Science Lab Write Up

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B8 Inquiry Activity: Investigating Physical and Chemical Changes Matt Thomas SNC-1DI Mr. Shaw Due Date: Friday, Oct 5th Cut-off Date: Tuesday, Oct 9th Purpose: What are some characteristics of chemical and physical changes? Background: A chemical change is difficult to reverse and a physical change is not and you can’t always see a chemical change. The 5 characteristics of a chemical change are, a new colour appears, heat or light is given off, bubbles or a gas is formed, solid forms in a liquid or the change is difficult to reverse. Hypothesis: Test 1- The chemicals might release gases and bubble. Test 2- The sugar might change into a liquid or change colour. Test 3- The chemicals might produce a gas and bubble. Test 4- Once the chemicals combine they might solidify or become very viscous. Materials: Refer to page 158 in Pearson Investigating Science 9 Changes made are aluminum muffin tins to evaporation trays and 5mL measuring spoons to 10mL beakers. Safety: Sodium carbonate is corrosive, toxic and infectious. Hydrochloric acid is corrosive. Copper (II) Sulphate is toxic and infectious. Procedure: Refer to page 158 in Pearson Investigating Science 9. A change made was instead of 5 mL it was 3mL. (Test 3) Hypothesis: Refer to page 2 of lab. Test | Before Change | During Change | After Change | Sugar and Heat | The sugar is white and in a crystal form. (balls) | The sugar will start to liquefy and turn yellow. | The sugar will start to become hard again at room temperature. | Sodium Carbonate and Hydrochloric acid | The sodium carbonate is a white powder and is not in crystal form. The hydrochloric acid is a clear non-viscous liquid. | The mixture will start to bubble vigorously and release a gas. | Most of the mixture will evaporate leaving only a small amount in the test tube. | Copper (II) Sulphate and Sodium Carbonate | The copper (II)

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