Basics

Question 1

Chemistry

Answer 1

Science of matter and the changes it undergoes

Question 2

Matter

Answer 2

Anything that takes up space and has mass

Question 3

3 states of matter

Answer 3

Liquid
Solid
Gas

Question 4

Compounds

Answer 4

Made of more than one kind of element

Question 5

All matter is composed of

Answer 5

Atoms

Question 6

Pure substance

Answer 6

Have fixed or specific compositions and can’t be broke down by physical processes

Question 7

Elements

Answer 7

Composed of only one type of atom

Question 8

Elements cannot

Answer 8

Be broken down into simpler substance

Question 9

Molecule

Answer 9

Two of the same element or a combo of different elements joined by a COVALENT bond

Question 10

H2O —> H2 + O2

Answer 10

Chemical

Question 11

H2O(l) —-> H2O(g)

Answer 11

Physical

Question 12

Mixture

Answer 12

Consists of two or more substances that are physically mixed, but not chemically combined

Question 13

Physical Methods

Answer 13

Boiling
Freezing
Distilling 
Straining
Magnetism

Question 14

Crude Oil

Answer 14

Mixture of hydrocarbons

Question 15

Crude oils are separated by

Answer 15

Boiling points

Question 16

Chemical Reaction

Answer 16

Always forms a new substance

Ex: burning wood changes the wood into ash, CO2, H2O, and heat

Question 17

Solid

Answer 17

Rigid, has fixed shape and volume

Question 18

Liquid

Answer 18

Has definite volume but takes shape of the container it’s in
Flows easily
Not compressible

Question 19

Gas

Answer 19

Has not fixed volume, takes the shape and volume of container
Flows easily
Compressible

Question 20

_________ ——-> _________

Answer 20

Reactants —–> products

Question 21

Law of Conservation of Mass

Answer 21

In every physical or chemical reaction, no mass is lost or gained

Question 22

Precise

Answer 22

Measurements that are close together

Question 23

Accurate

Answer 23

Measurements that are close to true value

Question 24

Rules for significant figures

Answer 24

1. All nonzero digits are significant
2. All zeros between nonzeros are significant
3. Zeros to the right of a nonzero with a decimal are significant
4. All digits in the coefficient of scientific notation are significant
5. All zeros to the left of the first nonzero are NOT significant
6. Zeros to the right of a nonzero WITHOUT A DECIMAL are NOT significant

Question 25

Exact Numbers

Answer 25

Have an infinite number of significant figures because there is no estimated digit

Question 26

Measured Numbers

Answer 26

2. 5 x 3= 8
3. 895 x 0.35= 1.4

THIS IS THE KEYWORD

answer can only have as many figures as the LEAST significant number in the problem

Question 27

Tera

Answer 27

10^12

Question 28

Giga

Answer 28

10^9

Question 29

Mega

Answer 29

10^6

Question 30

Kilo

Answer 30

10^3

Question 31

Deci

Answer 31

10^-1

Question 32

Centi

Answer 32

10^-2

Question 33

Milli

Answer 33

10^-3

Question 34

Micro

Answer 34

10^-6

Question 35

Nano

Answer 35

10^-9

Question 36

Pico

Answer 36

10^-12

Question 37

Density

Answer 37

Mass/ volume