Unit 2- Matter

Question 1

Properties of solids (7)

Answer 1

-higher density
Defined shape and volume
Low KE
Can’t be compressed
Undergoes melting
Vibrational motion
Mutual attraction

Question 2

Properties of liquids (6)

Answer 2

Undergoes freezing
Undergoes vaporization
Can’t be compressed
Can flow
Defined volume
Mutual attraction

Question 3

Properties of gas (5)

Answer 3

High KE
Can be compressed
Random motion
Low density
Matter takes both its shape and volume of its container

Question 4

Do higher or lower dense objects float higher if no mixing

Answer 4

Less dense

Question 5

Density changes with what

Answer 5

Changes with temperature
Higher temp= ^volume, lower density

Question 6

What does density show about particles

Answer 6

Shows how compact particles are in a substance

Question 7

Density is the ratio between…

Answer 7

Mass and volume

Question 8

Density depends on ___ not ___, aka intrinsic

Answer 8

Depends on substance not size

Question 9

M=
D=
V=

Answer 9

M=(D)(V)
D=M/V
V=M/D

Question 10

When 2 atoms are touching what is holding them together

Answer 10

A chemical bond

Question 11

Elements

Answer 11

1 type of atom/chemical
Cannot be broken down
Keeps chemical identity
Pure
The simpliest form of matter that has a unique set of properties

Question 12

Compounds

Answer 12

2 or more types of chemically bonded atoms/elements
Chemically broken down
Pure

Question 13

Mixtures

Answer 13

Combination of two or more
Not chemically combined
Separated by physical means
Not pure
& symbol in code

Question 14

Homogeneous mixture —solution

Answer 14

Cannot see different parts
Uniform throughout
Solution: things dissolved in liquid, light can pass/shine through

Question 15

Heterogenous— suspension and colloid

Answer 15

Can see different parts
Is not uniform throughout
Suspension: suspended particles in a liquid that will eventually settle out (Sand and water)
Colloid: suspended particles that don’t settle due to small size (milk)

Question 16

Centrifuge

Answer 16

Separate by density

Question 17

Chromatography

Answer 17

Separating components of an ink or dye

Question 18

Distillation

Answer 18

Separation of two or more liquids based on boiling points

Question 19

Electrolysis

Answer 19

CHEMICAL SEPARATION H atoms from the oxygen atom in a water molecule

Question 20

Decantation

Answer 20

Pouring off a liquid from a mixture containing both a liquid and solid

Question 21

Cystallization

Answer 21

Boiling point, liquid not recovered, only solid remains

Question 22

T/F: a mixture is not a chemical combining of substances

Answer 22

True

Question 23

In a compound, the atoms are chemically combined so that the elements that make up the compound…

Answer 23

Loose their identities and do take on new set of properties

Question 24

What is the smallest identifiable unit of a compound that is made up of atoms which are chemically bonded

Answer 24

Elements

Question 25

A mixture is always made up of ___

Answer 25

A combination of compounds

Question 26

T/F in a mixture substances do not retain their identities

Answer 26

False

Question 27

What is the smallest identifiable unit of an element

Answer 27

An atom

Question 28

Mass

Answer 28

Amount of matter that an object contains

Question 29

Physical properties

Answer 29

Characteristics of substance, not how it behaves
Observed w/out changing
No need to chemically alter

Question 30

Chemical property

Answer 30

Describe chemical composition will change given a specific set of conditions
Observed by changing
Need to chemically alter to determine the properties

Question 31

Chemical change

Answer 31

Involves a change in the identity/chemical makeup of that substance
All chemical changes are accompanied by physical change

Question 32

Physical change

Answer 32

No change in identity
All changes of state of matter