Ch 11

Question 1

chemical equation

Answer 1

a written EXPRESSION of REACTANTS and PRODUCTS

Question 2

chemical reaction

Answer 2

the PHYSICAL mixing of chemicals in which a CHANGE is evident

Question 3

you ____ equations and ____ reactions

Answer 3

do; write

Question 4

subscript

Answer 4

smaller number part of equation

Question 5

coefficient

Answer 5

balances equations

Question 6

ALL chemical equations involve___

Answer 6

changing substances

Question 7

word equations v. chemical equations

Answer 7

word have words, chemical have compounds and elements

Question 8

skeleton equations only show

Answer 8

reactants and products

Question 9

‘yield’ sign with triangle means

Answer 9

heat was applied

Question 10

‘yield’ sign with Pt means

Answer 10

catalyst was applied

Question 11

catalyst

Answer 11

speeds up reaction but not used during it (neither reactant nor product)

Question 12

balanced equations

Answer 12

of atoms on each side is equal, mass is conserved

Question 13

the activity series lists _____ in _____ reactivity

Answer 13

metals; decreasing

Question 14

halogens can be considered their own _____

Answer 14

activity series; because they decrease in reactivity as you go down

Question 15

double replacement reactions show a chemical change with _____

Answer 15

an exchange of cations

Question 16

one of the following is usually true for double replacement reactions:

Answer 16

• one of the products is soluble, and the other forms a precipitate
• one of the products is a gas
• one of the products is a molecular compound (like water)

Question 17

double replacement reactions are generally in

Answer 17

aqueous solutions

Question 18

in COMBUSTION reactions, if not enough oxygen is present____ can be products

Answer 18

soot and CO gas (carbon monoxide)

Question 19

hydrocarbons are important because

Answer 19

they are high energy fuels when burned

Question 20

what does a net ionic equation show about double replacement that a molecular doesn’t?

Answer 20

the importance of water in separating ions

Question 21

synthesis

Answer 21

A+B–> AB
also:
metal oxide+ H2O –> metal hydroxide
non metal oxide+ H2O—> acid

Question 22

decomposition

Answer 22

AB–> A + B
usually REQUIRES energy
also:
metal carbonate–> metal oxide + carbon dioxide
metal chlorate—> metal chloride + oxygen

Question 23

single replacement

Answer 23

A+BC–> AC+B
A and B are metals
A must be higher than B on activity series

• be aware that all halogens follow these same rules

Question 24

double replacement

Answer 24

AB+CD–> AD + CB
(inner and outer)
if all are reactants are aqueous, NVR

Question 25

combustion

Answer 25

hydrocarbon + O2--> CO2+H2O

Question 26

balancing checklist

Answer 26

1. HOClBrFIn 2. balanced charges in compounds 3. balanced atoms on each side

Question 27

net ionic equations describe

Answer 27

only the species that change in the reaction (reactants that change states of matter) ONLY DOUBLE REPLACEMENT REACTIONS

Question 28

why do net ionic equations only describe double replacement?

Answer 28

in all other reactions EVERYTHING changes, so it's the same as the molecular