Chapters 1-3

Question 1

mega

Answer 1

10^6

Question 2

kilo

Answer 2

10^3

Question 3

deci

Answer 3

10^-1

Question 4

centi

Answer 4

10^-2

Question 5

milli

Answer 5

10^-3

Question 6

micro

Answer 6

10^-6

Question 7

nano

Answer 7

10^-9

Question 8

periods run ____?

Answer 8

side to side

Question 9

groups run ____?

Answer 9

up and down

Question 10

Name the seven diatomic molecules in order from smallest to biggest

Answer 10

-hydrogen
-nitrogen
-oxygen
-fluorine
-chlorine
-bromine
-iodine

Question 11

Describe a homogeneous solution

Answer 11

uniform composition; ie: tea

Question 12

Describe a heterogeneous solution

Answer 12

not uniform; ie: salt water and copper wire

Question 13

What is a solvent

Answer 13

water

Question 14

What is a solute

Answer 14

sugar

Question 15

Pure substances are either ______ or ______.

Answer 15

elements or compounds

Question 16

Mixtures are either

Answer 16

heterogeneous or homogeneous

Question 17

Alkali metals are

Answer 17

reactive

Question 18

Noble gases are

Answer 18

nonreactive

Question 19

phase change of freezing is

Answer 19

liquid to solid

Question 20

phase change of melting

Answer 20

solid to liquid

Question 21

phase change of evaporation is

Answer 21

liquid to gas

Question 22

phase change of condensation is

Answer 22

gas to liquid

Question 23

phase change of sublimation is(ie: dry ice)

Answer 23

solid to gas

Question 24

What are the four observations that may indicate a chemical change?

Answer 24

1. formation of a solid(precipitate) when two materials are mixed
2. color change
3. evolution of gas(bubbles)
4. temperature change

Question 25

What does exothermic mean?

Answer 25

hot

Question 26

What does endothermic mean?

Answer 26

cold

Question 27

When bonds are broken...

Answer 27

energy is absorbed by the surroundings

Question 28

When bonds are formed...

Answer 28

energy is released to the surroundings

Question 29

What is a hypothesis?

Answer 29

initial explanation for some observed fact based on observation and evidence; to be tested

Question 30

What are theories?

Answer 30

broader in scope; explain/predict different observations linked by same phenomena

Question 31

What are scientific laws?

Answer 31

scientific observations that are always true; laws are statements of a phenomenon without explanation

Question 32

What is the Law of Conservation of Mass?

Answer 32

mass is neither created nor destroyed; a reaction is just a rearrangement of reactants to products; no new atoms formed

Question 33

What is combustion?

Answer 33

burning; reaction needs O2

Question 34

What is accuracy?

Answer 34

closeness of measurement to the true value

Question 35

What is precision?

Answer 35

closeness of set values to each other

Question 36

How many sigfigs? 13700

Answer 36

5

Question 37

How many sigfigs? 1.370 X 104

Answer 37

4

Question 38

How many sigfigs? 1.37 X 104

Answer 38

3

Question 39

How many sigfigs? 1.3700000

Answer 39

8

Question 40

13,700. has 5 sig figs bc of

Answer 40

decimal point

Question 41

13,700 has 3 sig figs bc of

Answer 41

no decimal point

Question 42

How many sig figs? 1.09

Answer 42

3

Question 43

How many sig figs? 0.1

Answer 43

1

Question 44

How many sig figs? 0.3040

Answer 44

4

Question 45

How many sig figs?

Question 46

Density equals

Answer 46

M/V

Question 47

Mass equals

Answer 47

DV

Question 48

Volume equals

Answer 48

M/D