1. If two substances are mixed and a new substance is formed, what type of change is it? _______________________________________________________________________________________________

 

2. Placing the spoon in hot water was a physical change since the melted metal was still…

a. gallium

b. iron

c. steel

d. aluminum

 

3. When a substance changes states (melts, evaporates, etc.) it is often what type of change? _______________________________________________________________________________________________

 

4. Fill in the blank using physical change or chemical change. When something burns, it is a __________________________________________________

 

5. True or false: since gas is detected during the candy + soda demo, it is an example of a chemical change. _______________________________________________________________________________________________

 

6. What is the evidence that the gas made in the mentos + soda demo was carbon dioxide? _______________________________________________________________________________________________

 

7. Which of these is the most reliable way to see if a new gas has formed?

a. Fill up a balloon

b. Flame test

c. Measure temperature

d. Look at it

 

8. How does hydrogen react in a flame test? __________________________________________________________

 

9. Milk spoiling is an example of which type of change? ________________________________________________

 

10. What type of change is mixing air into egg whites to make frosting?___________________________________