Unit 5 Chemistry

2. Stuff made of two or more different elements mixed together.
3. Element Elements that naturally pair up, like hydrogen and oxygen, making molecules with two atoms.
5. Replacement Positive and negative parts of two compounds switch, creating two new compounds.
8. (or Combination) When two or more things come together to make something new.
9. When electrons jump from one atom to another, making one positively charged and the other negatively charged.
10. Tiny things with electric charges because they gained or lost some electrons.
12. Things that mix in a reaction and change into something else.
13. When something breaks down into simpler parts.

1. A rapid reaction with oxygen, often producing heat, light, and new substances.
4. A number before a chemical formula showing how many molecules or units are involved in a reaction.
6. A small number written below and to the right of a chemical symbol to show how many atoms of that element are in a compound.
7. When atoms share electrons to stick together.
8. Replacement One thing swaps places with another in a compound, making a new compound and a different single element.
11. The new things made during a reaction.