Lesson 2

Question 1

It is the study of matter and the
changes it undergoes.

Answer 1

Chemistry

Question 2

is anything
that occupies space and has mass.

Answer 2

Matter

Question 3

4 classifications of matter

Answer 3

substances,
mixtures, elements, and compounds.

Question 4

classification of matter that Has definite composition and distinct properties

Answer 4

substance

Question 5

Combination of two or more substances. It can be created and
then separated by physical means into its pure component
without changing the identities of the components.

Answer 5

mixture

Question 6

the composition is uniform throughout the
mixture

Answer 6

homogeneous

Question 7

the composition is not uniform

throughout the mixture

Answer 7

heterogeneous

Question 8

Cannot be separated into simpler substances by chemical
means

Answer 8

Elements

Question 9

Composed of atoms of two or more elements chemically united
into their pure composition. They can be separated only by
chemical means into their pure components.

Answer 9

compounds

Question 10

molecules are held close
together in an orderly fashion with little freedom of
motion.

Answer 10

solid

Question 11

close together but are
not held so rigidly in position and can move past one
another.

Answer 11

liquid

Question 12

the molecules are separated by
distances that are large compared with the size of the
molecules.

Answer 12

gas

Question 13

Can be measured and observed without changing
the composition or identity of a substance

Answer 13

Physical Property

Question 13

does not depend on the
amount of substance present

Answer 13

Intrinsic/Intensive

Question 14

color, odor, taste, density, boiling point,
melting point

Answer 14

Intrinsic/Intensive

Question 15

depends on the amount
of substance present

mass, volume, length

Answer 15

extrinsic/extensive

Question 16

Observed during a reaction in which the chemical
composition or identity of the substance is
changed.

Answer 16

chemical property

Question 17

energy released during
combustion

Answer 17

Heat of Combustion

Question 18

ΔHc

Answer 18

Heat of Combustion

Question 19

whether a compound will
react with water or air

Answer 19

chemical stability

Question 20

whether a compound will burn
when exposed to flame

Answer 20

flammability

Question 21

It is a process in which a
substance (or substances) is changed into one or
more new substances.

Answer 21

Chemical Reaction

Question 22

To represent chemical reaction, _______ is used.

Answer 22

chemical
equation

Question 23

uses chemical symbols to
show what happens during a chemical reaction. It is a shorthand method of
representing chemical reaction using chemical
symbols and formulas to indicate the reactants and
the products.

Answer 23

chemical
equation

Question 24

are the starting materials in a chemical
reaction

Answer 24

Reactants

Question 25

is the substance formed as a
result of a chemical reaction.

Answer 25

Products

Question 26

the reactants are conventionally written on the ______
and the products on the __________of the arrow.

Answer 26

-left
-right

Question 27

is a reaction where two
or more elements or compounds (reactants) combine to
form a single compound (product)

Answer 27

Combination/synthesis reaction

Question 28

Type of reaction:
4AI(s) + 3O2(g)=2AI2O3(s)

Answer 28

synthesis

Question 29

type of chem reaction where a compound breaks down into two or more simpler
substances

Answer 29

decomposition reaction

Question 30

2KCIO3(s)=2KCI(I) +302(g)

Answer 30

decomposition

Question 31

more active metal can displace a less active metal,
while a less active one can’t displace the more active.

Answer 31

displacement reaction

Question 32

2AI(s) + 6HCI(aq)= 2AICI3(aq) + 3H2(g)

Answer 32

displacement

Question 33

the positive ions exchange
partners with the negative ions to form two new compounds.

Answer 33

double displacement or metathesis

Question 34

CaCO3(s) + 2HCl(aq) =CaCl2(aq) + CO2(g) + H2O(l)

Answer 34

double displacement reaction

Question 35

an acid and base quantitatively react together to form a salt
and water as products

Answer 35

neutralization reaction

Question 36

reaction of elements and compounds with oxygen

Answer 36

combustion reaction

Question 37

is a term used to describe
quantitative relationships in chemistry.

Answer 37

stoichiometry

Question 38

It is the
quantitative study of reactants and products in a
chemical reaction.

Answer 38

stoichiometry

Question 39

this approach means that the stoichiometric coefficients in a
chemical equation can be interpreted as the number
of moles of each substance.

Answer 39

mole method