Unit 4

Question 1

the substances you start with

Answer 1

reactants

Question 2

the substances you end up with (new substances
are formed)

Answer 2

products

Question 3

atoms cannot be created or destroyed

Answer 3

Law of Conservation of Mass

Question 4

Law of Conservation of Mass

Answer 4

atoms cannot be created or destroyed

Question 5

All the atoms we start with we must end up with

Answer 5

Law of Conservation of Mass

Question 6

A balanced equation has the same number of each element
on both sides of the equation. Atoms are rearranged to
form new substances.

Answer 6

Law of Conservation of Mass

Question 7

rusting iron + burning wood

Answer 7

chemical reaction

Question 8

color, shape, state of matter, shape, mass

Answer 8

Physical Properties

Question 9

bonds of the reactants are broken, and bonds of the product are formed

Answer 9

during a chemical reaction

Question 10

what type of reaction is
xa+b -> xb+a

Answer 10

single replacement

Question 11

burning wood, frying and egg, rusting metal, digesting food

Answer 11

Chemical Changes

Question 12

-Unexpected color change
 New odor
 Gas bubbles
 Light production
-An increase or decrease in temperature
(exothermic/endothermic)
 Precipitate (formation of a solid)

Answer 12

signs of a chemical change

Question 13

the construction of complex chemical compounds from
simpler ones (A + X -> AX)

Answer 13

synthesis

Question 14

atoms are rearranged during what type of reaction?

Answer 14

during a chemical reaction

Question 15

chemical equations must be balanced in order to comply with what scientific law

Answer 15

the of conservation of mass

Question 16

processes in which chemical species break up into
simpler parts (AX -> A + X)

Answer 16

decomposition

Question 17

which of the following types of reactions takes 2 substance and combines them to create 1 new substance

Answer 17

synthesis

Question 18

which is not an indication that a chemical change has taken place

Answer 18

an objects is split into two equal halves

Question 19

A+B -> AB is what???????

Answer 19

synthesis

Question 20

reactants on the…
products on the….

Answer 20

r-left
p-right

Question 21

a chemical reaction in which one element
replaces another in a compound (AX + B -> BX + A)

Answer 21

single replacement

Question 22

two ionic compounds that are exchanging anions
or cations (AX + BY -> AY + BX)

Answer 22

double replacement

Question 23

an equation is balanced by…

Answer 23

changing or adding coefficients

Question 24

what cannot be changed when balancing equations

Answer 24

subscripts