Question 1
A unit conversion expresses an original measurement in new units.
True
False
Skip.
Question 2
A quantity that allows the conversion between units is called a conversion factor.
True
False
Skip.
Question 3
Mole ratios from balanced chemical equations can be used as conversion factors.
True
False
Skip.
Question 4
The reciprocal of a conversion factor is also a conversion factor.
True
False
Skip.
Question 5
The conversion factor between the number of objects and moles of objects is
3.01 x 10
23
objects/mole.
6.02 x 10
23
objects/mole.
12.04 x 10
23
objects/mole.
None of the above.
Skip.
Question 6
For the following reaction: 2H
2
+ O
2
→ 2H
2
O
If one mole of O
2
is used, how many moles of H
2
are used?
1
2
3
None of the above.
Skip.
Question 7
How many grams does 3.2 moles of helium, He, correspond to? He has 4 grams per mole.
0.8 grams
1.25 grams
12.8 grams
None of the above
Skip.
Question 8
The mole-grams conversion factor for sodium, Na, is about 23 g/mole. How many moles of sodium are there if you have 32 g of sodium?
736 moles.
0.72 moles.
1.39 moles.
None of the above.
Skip.
Question 9
For the following reaction: 2H
2
+ O
2
→ 2H
2
O
If one mole of O
2
is used, how many grams of hydrogen gas, H
2
, are used? The mole-gram conversion factor for hydrogen gas is 2 g/mole.
2 grams
3 grams
4 grams
None of the above.
Skip.
Question 10
The density of aluminum, Al, is 2.70 g/mL. What will the volume (in mL) be for 1.5 g of Al?
4.05 mL
1.8 mL
0.56 mL
None of the above.
Skip.
Question 11
How many grams are in 6.3 moles of copper, Cu? Cu has 63.5 g/mole.
400 g
10.1 g
0.1 g
None of the above.
Skip.
Question 12
How many moles are in 10.6 g of iron, Fe? Fe has 55.8 g/mole.
591.5 moles
5.26 moles
0.19 moles
None of the above.
Skip.
Question 13
In a reaction, two moles of hydrogen gas, H
2
, react with one mole of oxygen gas, O
2
. How many moles of oxygen gas are used when three moles of hydrogen gas react with the oxygen in this reaction?
1.5 moles
3 moles
6 moles
None of the above.
Skip.
Question 14
The mole-gram conversion factor for hydrogen gas is 2 g/mole. For the reaction where two moles of hydrogen gas react with one mole of oxygen gas, which means that the hydrogen-oxygen mole reaction ratio is 2:1, how many moles of oxygen gas will be used when four grams of hydrogen gas are consumed?
1 mole
1.5 moles
2 moles
None of the above.
Skip.
Question 15
The mole-gram conversion factor for hydrogen gas is 2 g/mole and for oxygen gas it is 32 g/mole. For the reaction in the last two problems, where the hydrogen-oxygen mole reaction ratio is 2:1, how many grams of oxygen will be used when 3.5 grams of hydrogen are consumed?
7 grams
14 grams
28 grams
None of the above.
Skip.
Question 16
A unit conversion expresses an original measurement in new units such that the magnitude of the original measurement is reflected in the new units.
True
False
Skip.
Question 17
Unit conversions can be within one type of measurement or between different types of measurement.
True
False
Skip.
Question 18
A person weighs 110 lb, what is their approximate weight in kg? Recall that a kilogram is about 2.2 pounds.
242 kg
112.2 kg
50.0 kg
32.8 kg
Skip.
Question 19
Someone's finger is 3 inches long. How many centimeters is that? Recall that 1 in = 2.54 cm.
1.12 cm
7.62 cm
0.85 cm
9.24 cm
Skip.