chem final unit 1

Question 1

sig figs rules

Answer 1

• Trailing zeros (zeros after nonzero digits) are significant if there is a decimal point 50.0 has 3
• Trailing zeros without a decimal point are NOT significant. 500 has 1
• Leading zeros (zeros before nonzero digits) are NOT significant. even with decimal point 0.0025 has 2

Question 2

1001 - how many sig figs

Answer 2

4

Question 3

1000 - how many sig figs

Answer 3

1

Question 4

0.001 - how many sig figs

Answer 4

1

Question 5

100.0 - how many sig figs

Answer 5

4

Question 6

0.100 - how many sig figs

Answer 6

3

Question 7

pure substance

Answer 7

a substance that contains 1 type particle (atom or molecule)

Question 8

percent error equation

Answer 8

measured - actaul /actual x100

Question 9

precision error equation

Answer 9

range/2 /average x 100 range is highest value - lowest value

Question 10

KHDBDCM

Answer 10

k=1000 h=100 d=10 b= base units d= 0.1 c= 0.01 m= 0.001

Question 11

what is matter

Answer 11

its anything that takes up space, its composed of particles Mass (g) is the measure of matter voluem is the liquid form (mL)

Question 12

relationship with mdv

Answer 12

m/d|v

Question 13

physical properties

Answer 13

density MP BP and soublity

Question 14

chemical properties

Answer 14

how something reacts to another thing

Question 15

mixture

Answer 15

a substance that contains more than one type of particle (atom or molecule)

Question 16

atom

Answer 16

one element

Question 17

molecule

Answer 17

2 or more of the same atoms bonded

Question 18

compound

Answer 18

2 or more different atoms bonded s

Question 19

si unit for lenght

Answer 19

meter (m)

Question 20

si unit for time

Answer 20

second s

Question 21

si unit for mass

Answer 21

kilogram kg

Question 22

si unit for volume

Answer 22

cubic meters (m³)

Question 23

si unit for temp

Answer 23

kelvin K K=°C+273

Question 24

adding with sig figs

Answer 24

use the number with the least decimal places to guide your answer

Question 25

muliplying with sig figs

Answer 25

use the number with the lowest sig figs to guide your anser