Properties of matter
Which term does not describe a conversion between states of matter? Also explain why:
a.) condensation
b.) melting
c.)evaporation
d.)freezing
e.)mixing
e.) mixing
because when you mix substances, you are simply combining them without changing their individual states of matter.
write in scientific notation
61500 cm
6.15 x 104 cm
how many SIG FIGs?
55
2
calculate and use proper sig figs
123.456 + 7.8 + 0.0091
131.3
8.88 km to nm
8.88 x 1012 nm
Which elements belong in same group?
1.) C, N, O
2.) Al, Ge, sb
3.) F, Cl, Br
4.) B, Si, As
5. Fe, Cu, Ni
3.) F, Cl, Br
groups are vertical lines (18) on periodic table
write in scientific notation
0.0355 m
3.55 x 10-2 m
how many sig figs?
50
1
calculate and round to proper sig figs:
0.00456 + 0.0789 − 0.00032=
0.0831
If 25.0 g of olive oil has 850 cal of heat added to it at a room temperature of 24.0 °C, what will be the final temperature of the olive oil?
The specific heat of olive oil is 2.19 cal/g °C.
Submit your answer in standard notation in °C and with proper significant figures.
Use the formula:
Which element is represented by chemical symbol K?
kaolin
sodium
potassium
silver
phosphorus
potassium
Write in standard notation
9.595 x 105
959500
how many sig figs?
0.620
3
calculate and round to proper sig figs
0.0567 × 12.34=
0.700
What is the volume in cm³ of a gold nugget that weighs 15 kg? The density of gold is 19.0 g/cm³. Report your answer with the proper significant figures in standard notation.
Given
Mass = 15 kg = 1.5 × 10⁴ g
Density = 19.0 g/cm³
Volume = mass ÷ density
1.5 × 10⁴ g ÷ 19.0 g/cm³
= 7.9 × 10² cm³
Air, which contains nitrogen, oxygen, and other gases, is an example of:
A) Mixture
B) Compound
C) Element
D) Solution
A) Mixture
Write in standard notation
7.98 x 10-6
0.00000798
how many sig figs?
2056
4
calculate and round to proper sig figs
14570 kg ÷ 5.81 L
2510 kg/L
The dosage of quinine when a 125 Ib adult takes a 2.5 mg tablet is mg drug per kg of body weight. (2.20 pounds = 1.00 kg). Report your answer in standard notation with proper significant figures.
125 lb × (1 kg / 2.20 lb) = 56.8 kg
2.5 mg ÷ 56.8 kg = 0.044 mg/kg (2 sig figs)
Answer: 0.044 mg/kg
Oil floating on water is an example of:
A) Homogeneous mixture
B) Heterogeneous mixture
C) Compound
D) Pure substance
B) Heterogeneous mixture
Calculate and then convert to standard notation
(5.3 x 109)(3.1 x 10-3) / (5.0214 x 105)
3.27×101= 32.7
how many sig figs?
0.00560
3
calculate and round to proper sig figs
(12.345 + 0.6789) ÷ 3.21=
4.06
An extra-strength aspirin contains 0.500 g of aspirin. How many grains is this?
(1 grain = 64.8 mg)
Given
0.500 g aspirin
1 grain = 64.8 mg
Convert g → mg
0.500 g × 1000 mg/g = 500 mg
Convert mg → grains
500 mg ÷ 64.8 mg/grain = 7.72 grains
0.500 g has 3 sig figs, so:
Answer: 7.72 grains