4.1 WHAT ARE CHEMICAL REACTIONS?

Question 1

What is chemical reaction?

Answer 1

Change that makes new substances

Question 2

About chemical reactions:

Answer 2

1. Atoms are rearranged and join together differently
2. Most chemical reactions are not easily reversible
3. All chemical reactions transfer energy to or from the surroundings.

Question 3

Metal + Acid -> ???

Answer 3

Salt + Hydrogen