unit 1

Question 1

what are reactants?

Answer 1

atoms in reacting substances (added together)

Question 2

what are products?

Answer 2

new substances formed when reactants= rearranged

Question 3

what are chemical equations?

Answer 3

describe chemical reactions

Question 4

what is a chemical change?

Answer 4

substances=converted into 1+ new substances + have different properties/formulas

Question 5

what is a combination reaction?

Answer 5

2+ elements/compounds bond -> form 1 product

Question 6

what is a decomposition reaction?

Answer 6

reactant splits into 2+ simpler products

Question 7

what is a single-replacement reaction?

Answer 7

reacting element switches w/ an element in the other reacting compound

Question 8

what is a double-replacement reaction?

Answer 8

positive ions in the reacting compounds switch places

Question 9

what is a combustion reaction?

Answer 9

carbon-containing compound (usually a fuel) burns in O2 gas to —> CO2 + H2O + energy

Question 10

what is an oxidation-reduction reaction?

Answer 10

(AKA redox) e- transferred from one substance to another

Question 11

what is oxidation?

Answer 11

electrons are lost

Question 12

metals ____?

Answer 12

oxidize (lose e-)

Question 13

what is reduction?

Answer 13

electrons are gained

Question 14

nonmetals ___?

Answer 14

reduce (gain e-)

Question 15

what is Avogadro’s number?

Answer 15

6.02x10^23

Question 16

what is a mole?

Answer 16

of atoms + particles + ions

Question 17

what is molar mass?

Answer 17

quantity of grams that equals the atomic mass of that element
1 mol of an element = g of element

Question 18

what is the law of conservation of mass?

Answer 18

no change in the total mass of the substance’s reacting in a chemical reaction

Question 19

what is the limiting reactant?

Answer 19

reactant that is completely used up

Question 20

what is the excess reactant?

Answer 20

reactant is NOT completely used up and is left over