Question 1

number in front of element or compound used to balance equation by multiplying

Accepted Answer

coefficient

Question 2

The small number that is below and behind the element that tells the number of atoms

Accepted Answer

subscript

Question 3

speeds up a chemical reaction by lowering the activation energy

Accepted Answer

catalyst

Question 4

gets made in a chemical reaction

Accepted Answer

product

Question 5

starting material in a chemical reaction

Accepted Answer

reactant

Question 6

having one atom in the molecule

Accepted Answer

monatomic

Question 7

having 4 atoms in the molecule

Accepted Answer

tetratomic

Question 8

having 2 atoms in the molecule

Accepted Answer

diatomic

Question 9

states that mass is neither created or destroyed in chemical reaction [ # of atoms must be same before & after]

Accepted Answer

law of conservation of mass

Question 10

Decomposition

Accepted Answer

AB --> A + B (type of reaction)

Question 11

Combustion

Accepted Answer

CxHy + O2 --> CO2 + H2O (type of reaction)

Question 12

Synthesis

Accepted Answer

A + B --> AB (type of reaction)

Question 13

Double Replacement

Accepted Answer

AB + CD --> AD + CB (type of reaction)

Question 14

Single Replacement

Accepted Answer

AB + C --> CB + A (type of reaction)

Question 15

tetratomic elements

Accepted Answer

P and As are this type of element

Question 16

diatomic elements

Accepted Answer

N, O, H, F, Cl, Br, I are this type of element

Question 17

name of a chemical equation that is not balanced

Accepted Answer

skeleton

Question 18

having 8 atoms

Accepted Answer

octatomic

Question 19

2 lists that determine if a single replacement reaction happens

Accepted Answer

halogens and activity series of metals

Question 20

A chemical reaction that ABSORBS heat energy

Accepted Answer

endothermic reaction

Question 21

A chemical reaction that RELEASES heat energy

Accepted Answer

exothermic reaction

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