Chapter 1

Question 1

what is chemistry?

Answer 1

study of matter and the changes it undergoes

Question 2

what is matter?

Answer 2

anything that has mass and takes up space (volume)

Question 3

physical properties…

Answer 3

• identity of substance doesn’t change
• often just a state of change
• can be reversible

Question 4

chemical properties…

Answer 4

• color change
• smell
• gas production
• temp change
• precipitation (solid formation)

Question 5

two parts of matter

Answer 5

mass and volume

Question 6

SI unit of length

Answer 6

meter

Question 7

SI unit of mass

Answer 7

grams

Question 8

SI unit of volume

Answer 8

liters or centimeters

Question 9

SI unit of temp

Answer 9

kelvin and celsius

Question 10

SI unit of time

Answer 10

seconds

Question 11

what does kilo mean?

Answer 11

1000

Question 12

what does deci mean?

Answer 12

1/10

Question 13

what does centi mean?

Answer 13

1/100

Question 14

what does milli mean?

Answer 14

1/1000

Question 15

what is the difference between exact and inexact numbers?

Answer 15

exact numbers (12 in in a ft) can count and inexact numbers (length of this pen) is something you can measure.

Question 16

difference between accuracy and precision?

Answer 16

accuracy is how close a measurement is to actual value and precision is the exactness of a measurement (basically consistency)

Question 17

what are the 4 rule of sig figures?

Answer 17

1- all non 0 digits are significant
2- zero between non-zero digits are significant
3- trailing 0s are sig if it has a decimal
4- zeros left of 1st nonzero digit are insig

Question 18

what are the 2 rules of calculating sig figs?

Answer 18

1- when (x) or (/) have answers w least sig fig
.81 x 3.44 = 2.784 –> 2.8
2- when (+) or (-) have answers w least sig fig to the right of decimal
.8273 - .25 = .5773 –> .58

Question 19

density formula

Answer 19

density = mass/volume

Question 20

scientific notation rules

Answer 20

1- move decimal to left for positive exp

2- move decimal to right of neg exp