Which property of physical changes explains why matter is conserved in a physical change?

Where are chlorofluorocarbons found? 

 A. Coolants 

 B. The atmosphere 

 C. Solvents 

 D. All of the above

When substances go through chemical changes, which of the following will always happen?

Which process is a chemical change? Is it burning a match, boiling water, melting ice, or breaking glass?

When baking soda and vinegar react, the surface bubbles. What does this most likely indicate?

If there are 8 g of a substance before a physical change, how much will there be afterwards?

What must be done to be certain that a chemical change has taken place?