Unit Test 1

Question 1

Intensive property

Answer 1

A property that doesn’t change with the amount
Ex. Density, Color

Size of the sample doesnt matter

Question 2

Extensive Property

Answer 2

A property that change with the amount
Ex mass

Size of the sample does matter

Question 3

Molecules of a solid

Answer 3

Slightly moving (vibrate), are connected and stuck together
Has volume and shape

State of matter with defenite volume and shape

Question 4

Molecules of a liquid

Answer 4

Slow moving and spread apart

Has volume but no shape

Question 5

Molecules of gas

Answer 5

Move rapidly fast and chaotic
Has no volume or shape
Faster than gas is aqueous

Question 6

Elements

Answer 6

Defenition- Atoms
(# does not matter) gold is always gold
Can not be seperated

Question 7

Compound

Answer 7

Defenition - 2 or more ELEMENTS bonded together

Can be broken down by adding or subtracting water chemically but NOT psychically

Question 8

Heterogeneous Mixture

Answer 8

The factors of the mixture are different and not equally distributed
Ex granite, oak cabinets

Question 9

Homogeneous Mixture

Answer 9

The factors of a mixture are uniformly distributed

Ex gasoline, kool aid, saltwater

Question 10

Physical change

Answer 10

Substance changes form but does not change formula
Ex ice> water > liquid
(Can be undone)

Question 11

Chemical Change

Answer 11

Substance changes from chemical A to chemical B

Question 12

Indicators of chemical change

Answer 12

Gas is coming off
Heat and light
Color change
Precipitate is formed- 2 homogeneous mixtures combine

Question 13

Quantitative Measurments

Answer 13

Exact measurements of quantity or numbers

Ex mass, volume, temperatures

Question 14

Qualitative measurements

Answer 14

Based off of the senses
Look- estimates
Smell
Touch
Taste
Sound

Question 15

Scientific Notation

Answer 15

Used to express really big or small numbers
2.6 x 10 E 4
E is the # of decimal places to the right if a positive and left if negative to return to original form
Ex. 26000

Question 16

Temperature

Answer 16

Molecule Speed

Measured with kelvin (k) or degrees celcius (Co)

Question 17

Accuracy

Answer 17

Depends on measuring device

Ex 2.2, 2.39 2.38

Question 18

Precision

Answer 18

Multiple measurements close and consistent

You can be precise and accurate or precise but not accurate but never just precise

Question 19

Significant Figure Rules

Answer 19

(Only as good as least accurate device)

1. All non zeros count
2. All captive zeros count (406)
3. All leading zeros don’t count (.000003)
4. Trailing zeros only count with a decimal

Question 20

Significant Figure Calculations

Answer 20

Multiplication/ Division- round to the lowest # of significant figures

Addition/ Subtraction- round to least accurate place value

Question 21

Density

Answer 21

Formula = mass/ volume

Units g/cm^3

Question 22

Absolute Zero

Answer 22

Coldest possible (0K) or -273o C
Molecular movement stops

Question 23

Temperature Formula

Answer 23

oC + 273 = K

Question 24

Dimensional Analysis

Answer 24

1. Write all #s as fractions
2. Write everything w/ unit
3. Cancel out units
4. Top #s multiplied
5. Bottom #s divided each time

Question 25

Defenition of Matter

Answer 25

Anything that has mass or volume

Ex. Rock, water, dry ice

Question 26

Properties

Answer 26

Something thats important

Ex flammable or combustable

Question 27

Physical Properties

Answer 27

Can be tested without changing chemical makeup or property

Question 28

Chemical properties

Answer 28

In order to be tested, chemical properties must change