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

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?

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

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

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