WorksheetsEDM Chem B Unit 1 Review
Total questions: 20
Worksheet time: 23mins
What is the solution to this problem expressed to the correct number of sig figs? 12.0 / 7.11
1.688
1.69
1.7
1.70
What is the solution to the problem expressed to the correct number of significant figures?
15.11 + (142 × 16.5) = ?
2,358.1
2,358
2,360
2,400
One Significant Figure
1,000
Two Significant Figures
0.0093
Three Significant Figures
1.30
Four Significant Figures
1.008
Given:
SiO2 + 4HF → SiF4 + 2H2O
Reorder the following to correctly find how many grams of HF are needed for 182 mol of SiO2 to react completely.
182 mol SiO2
4 mol HF
2 mol SiO2
20.0 g HF
1 mol HF
242 g HF
The density of glycerin is 1.26 g/cm3. Which of the following conversion factors would you use to convert this to pounds/ft3?
1.26 g/cm3 x (a) x (b) = (c)
14 milligrams of CaCO3 can dissolve in 1 liter of water.
What is the proper setup to determine much water would be required to fully dissolve 11 grams of CaCO3?
(1000 mg = 1 g)
11 g CaCO3 x (a) = 790 L
What is the molar mass of Al2O3?
135.0
97.2
102.0
219.1
Jessica has 12.7 moles of a compound for an experiment. How many particles of the compound does she have? hint: 1 mole = 6.022 x 1023
7.65 × 1023
7.65 × 1024
2.1 x 10-23
2.1 x 10-23
Which of the following is the empirical formula?
C2H4
C3H6
C4H8
CH2
A compound has an empirical formula of C2H5. What is true about this empirical formula?
It models the structure of the compound.
It shows the ratio of elements in the compound.
It gives the mass of each atom in the compound.
It indicates the number of atoms in the compound.
It describes only this one compound.
2LiBr + Ba → BaBr2 + 2Li
In this chemical reaction, 325 grams of barium (Ba) react completely. How many moles of lithium (Li) are produced?
325 g Ba x (a) x (b) (c)
A mixture consists of glucose and water. What is the percent composition of glucose in the mixture if it contains 234 g of glucose (C6H12O6) and the total mass of the mixture is 276 grams?
26%
35%
77%
85%
A compound is used as a gasoline additive. It has a molecular weight of 60.10 atomic mass units and an empirical formula of C3H8O. The molecular formula is:
C6H4O
C3H8O
C6H10O2
C6H16O2
Why do real gases not behave exactly like ideal gases? (Select all that apply)
Real gases are always hotter than ideal gases.
Real gas particles do have significant volume.
Real gas particles have perfectly elastic collisions.
Real gas particles are smaller than ideal gas particles.
Real gas particles have more complex interactions than ideal gas particles.
A lung has a V of 2.9L. If its V decreases to 1.2L with 0.049 mol of air after exhaling, how many moles of air does it have when full?
0.025 mol
0.041 mol
0.083 mol
0.12 mol
In which location would the air most likely be at standard temperature and pressure (273 K, 1 atm)?
inside a car tire
above a bowl of ice water
outdoors on a summer day
above a pot of boiling water
at the top of a tall mountain
Boyles Law PV=k
Pressing on an inflated balloon decreases its size
Charles Law V/T = k
A balloon shrinks when taken outside in winter
Avogadros Law V/n = k
A balloon expands when air is blown into it
A balloon is filled with 0.250 moles of air at 308 K. If the volume of the balloon is 6.23 liters, what is the absolute pressure of the air in the balloon in kPa?
1.0 kPa
1.03 kPa
10.3 kPa
103 kPa
You collect a sample of gases from an indoor pool area. The sample contains air and water vapor. The total pressure is 100.18 kilopascals, and the partial pressure of the water vapor is 3.36 kilopascals. What is the partial pressure of the air in the sample?
29.8 kPa
51.77 kPa
96.82 kPa
103.54 kPa
The compressed gas in a sealed container has a gauge pressure of 1.8 atm. If the air around the container is at standard pressure (1.0 atm), what is the absolute pressure inside the container?
1.0 atm
101.3 kPa
2.8 atm
103.1 kPa
