chemistry
Across
- 4. is a reaction in which one element is substituted for another element in a compound.
- 5. in a chemical reaction mass is neither created nor destroyed.
- 6. 6.022 x 10^23
- 7. is a reaction in which a substance reacts with oxygen gas, releasing energy in the form of light and heat.
Down
- 1. reactions that occur when two different atoms or molecules interact to form a different molecule or compound.
- 2. is a reaction in which the positive and negative ions of two ionic compounds exchange places to form two new compounds.
- 3. is a reaction in which a compound breaks down into two or more simpler substances.