| In your jotter write the DATE in the margin. Now add a TITLE for your homework. Your title should be the name of the Homework: Chemical Changes Homework Week 3 |
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| Question 1. |
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| Examine the diagrams below. | |
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| a) | In your jotter, write down a list of those pictures which show a chemical reaction occurring. |
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Question 2. |
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| In each of the diagrams below a chemical reaction is occurring.
Examine the diagrams, and for each reaction and explain how you know a chemical reaction has taken place. |
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| b) | |
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| c) | |
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| d) | |
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| e) | |
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| Question 3. | |
| Which of these is a chemical reaction? | |
| A | A lake freezes solid. |
| B | Gravel, sand, and water are mixed |
| C | A copper bar is rolled into a flat sheet |
| D | Vinegar bubbles when baking soda is added. |
| Question 4. | |
| Which process is a physical change? | |
| A | Rusting iron |
| B | Burning coal |
| C | Melting ice |
| D | Tarnishing silver |
| Question 5. | |
| A mixture of iron filings and sulfur can easily be separated by — | |
| A | using a magnet |
| B | heating the mixture |
| C | dropping the mixture into acid |
| D | placing the mixture in water |
| Question 6. | |
| If you break a piece of glass, the shape of the glass changes, but the properties in the fragments remain the same. Which of the following has occurred? | |
| A | A physical change |
| B | A temperature change |
| C | A chemical change |
| D | A state change |
