Chemistry

4. law that states the more space, the less gas collisions
5. pH is usually less than 7, compared to bases
8. first column on the periodic table has elements that are apart of the ____
10. gives an idea of how much matter is in a space
11. transfer of electrons
12. phase change that occurs when a substance goes from a gas to solid
13. which reactions occurs when delta h is positive
14. a form of isotope that breaks down to become more stable by giving off radiation
16. how close a number is to the number desired
17. not good conductors of heat
18. system used to convert units by moving the decimal point (KHDUDCM)
19. proposed that light is made up of photons
20. mouthwash is a ____ Mixture

1. the letter q is used when put into formulas
2. device that is used to determine if the reaction is endothermic or exothermic
3. the last thing to look for when calculating mathematically
6. the ratio of the error to the actual value multiplied by 100
7. how strongly atoms attract to bond electrons to themselves
9. negatively charged ion
15. force explaining why at room temperature water is liquid