CP 1 Particles of Matter

Question 1

Give some examples of pure substances vs mixtures

Answer 1

Water vs Soup
NaCl Air
Coffee

Question 2

How can you separate mixtures

Answer 2

Distillation
Filtration
Centrifusion

Question 3

what are the phases of change

Answer 3

Solid
Liquid
Gas
Plasma

Question 4

what are the differences between physical and chemical properties

Answer 4

Physical
Property of substance that can be observed wo changing into other substance

Chemical
Can be observed by reacting it with another substance

Question 5

what is the formula for density

Answer 5

D= M/V

Question 6

What are the typical density units

Answer 6

• g/mol
• g/cm^3
• Kg/m^3

Question 7

what are the sig fig rules for + and -

Answer 7

○ Num of sig figs depends on number of decimal places in least accurate measurement

Question 8

what are the sig fig rules for x and /

Answer 8

○ Num of sig figs in the result = # in the least precise measurement used in the calculation

Question 9

TF Nonzero integers r always sig figs

Answer 9

T
356 = 3 sig figs

Question 10

TF Leading zeros are significant

Answer 10

F
- 0.000392 = 3 sig figs
- 0.0012 = 2 sig figs

Question 11

TF Trailing zeros r not significant (unless after decimal)

Answer 11

T
- 3700 = 2 sig figs
- 140.00 = 5 sig figs

Question 12

TF Captive zeros r not significant

Answer 12

F
- 16.07 = 4 sig figs
20.007 = 5 sig figs

Question 13

TF Exact numbers have infinite sig figs

Answer 13

T
- 1m=100cm
6

Question 14

What is the difference between Precision and Accuracy

Answer 14

Accuracy
- How close it is to the true value

Precision
- Agreement among repeated measurements