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 |
Question 1. |
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Examine the diagrams below. | |
a) | In your jotter, write down a list of those pictures which show a chemical reaction occurring. |
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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a) | |
b) | |
c) | |
d) | |
e) | |
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 |