Chapter 1

Question 1

Pure Substances are divided into ___________ and ____________.

Answer 1

elements and compunds

Question 2

Pure Substaces have a ______________ compostion and all specimens have the same _______________ and ____________.

Answer 2

constant composition; make-up; physical properties

Question 3

All substances are either ____________ or ____________.

Answer 3

Elements or compounds

Question 4

Elements - composed of only one type of ______________.

Answer 4

material

Question 5

All elements are composed of _________.

Answer 5

atoms

Question 6

Compounds - consists of two or more _________ that are always __________ _________ in the same proportion.

Answer 6

elements; chemically combined

Question 7

Properties - characteristics that define

Answer 7

an entire group

Question 8

extensive properties

Answer 8

depend on the amount of matter present

Question 9

intensive properties

Answer 9

doesn;t depend on the amount of matter present

Question 10

Physical properties

Answer 10

characterisics observed or measured without chaning the idenity of a substance

Question 11

physical changes

Answer 11

occur when matter undergoes a phyical change of state but its compostiion remains constantm

Question 12

melting point

Answer 12

temp at which a soild changes state fto a liquid

Question 13

freezing point

Answer 13

temp at which a solid changes liquid turns into a solid

Question 14

boiling point

Answer 14

liquid reach a temp where bubbles form within the liquid

Question 15

Physical appearance of a substance can also change with a _____________ _______________.

Answer 15

physical change
ex. salt dissovled in water

Question 16

Chemical Properties - describes the

Answer 16

describes ability of a substance
-to interact with other substances
-to change into a new substance

Question 17

Chemical changes- take place when

Answer 17

the orginal substance is converted to a new substance with different physical and chemical properties

Question 18

Signs that a Chemical change has happened

Answer 18

Change in color, temperature, texture, bubbles appear, production of a odor or new substance or a change in sound or light

Question 19

Mixtures - 2 or more __________ substances, ___________ _______ but not _________ ________.

Answer 19

Different; physically mixed; chemicall combined

Question 20

Homogeneous Mixture or Solution

Answer 20

composition is uniform throughout

Question 21

Heterogeneous Mixture ot Solution

Answer 21

components do not hace a uniform composition throughout

Question 22

Characistics of Metals

Answer 22

-shiny & metallic luster
-good electrical and heat conductor
-most are soid at room temperature
-malleability
-ductile- drawn into a fine wire

Question 23

Characteristics of Nonmetals

Answer 23

-many are soild at room temp (5 are solid)
-poor conductors of of heat and electricity

Question 24

Characteristics of Metalloids

Answer 24

-All are solid at room temp
-less mabeable than metals but not as brittle like nonmetals
- semiconductors of electricity