Chemistry

1. One sign of a chemical reaction is when _____________ and light is produced, which is often seen in the form of fire.
5. In order for a chemical reaction to occur, molecules need to _______________________ with the correct orientation and enough energy to make a new substance.
10. If the temperature was recorded over the course of time, this goes on the x-axis when making the line graph.
11. The name for NaCl.
12. The group of the Periodic Table of completely unreactive elements because they have full outer shells.
15. When magnesium combined with hydrochloric acid bubbles of ____________________ gas were produced which is a sign of a chemical reaction.
16. According to the Bohr model of an atom, the second shell of an atom can hold up to _________ electrons.
17. Positively charged sub-atomic particles in the nucleus of an atom.
18. Phenolphthalein is an acid-base indicator used this last week. It turns _____________ in the presence of a base.
19. If someone increases the amount of heat energy in a substance, they are increasing the ___________________. For example, 1 degree Celsius compared to 10 degrees Celsius.

2. According to the Bohr model of an atom, the innermost shell of an atom can hold up to _________ electrons.
3. A large, chain-shaped molecule that is made of repeating units, usually used for structural integrity, like sodium alginate.
4. Uncharged sub-atomic particles in the nucleus of an atom.
6. The most reactive metal tested last week because it has one electron in its outer shell it really needs to be rid of.
7. If someone increases the amount of substance in a set volume, they are increasing the ________________ of that substance. For example, 1M HCl compared to 2M HCl
8. The least reactive metal tested last week because it is so big, the atom does not care if it loses its outer electron or not.
9. When sodium thiosulfate mixed with hydrochloric acid, a permanent _________________ change was observed, which is a sign of a chemical reaction.
13. The reactivity of an element is determined by the number of ___________________ in the atoms outer shell.
14. The name for NaOH.