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WorksheetsChapter 5 Exam Review
Total questions: 29
Worksheet time: 29mins
Which of the following equations are balanced? (You need not balance the equations. Just determine whether they are balanced as written.)
I. Mg + 2 H2O → Mg(OH)2 + H2
II. 4 LiH + AlCl3 → 2 LiAlH4 + 2 LiCl
III. 2 KOH + CO2 → K2CO3 + H2O
IV. 2 Sn + 2 H2SO4 → 2 SnSO4 + SO2 + 2 H2O
II and IV
I and II
II and III
I and III
Consider the equation for the reaction of phosphine with oxygen gas to form tetraphosphorus decoxide and water:
PH3 + O2 → P4O10 + H2O (not balanced)
When the equation is balanced, how many molecules of water are produced for each molecule of P4O10 formed?
4
12
1
6
Refer to the following equation for the reaction of magnesium hydroxide [Mg(OH)2] with phosphoric acid (H3PO4).
Mg(OH)2 + H3PO4 →H2O + Mg3(PO4)2 (not balanced)
When the equation is balanced, how many H3PO4 molecules must react to produce one Mg3(PO4)2 formula unit? (Just as a molecule is the smallest unit of a molecular compound, a formula unit is the smallest unit of an ionic compound.)
3
1
6
2
Refer to the following equation for the reaction of magnesium hydroxide [Mg(OH)2] with phosphoric acid (H3PO4).
Mg(OH)2 + H3PO4 →H2O + Mg3(PO4)2 (not balanced)
When the equation is balanced, how many H2O molecules will be produced for each H3PO4 molecule that reacts?
3
6
2
1
Refer to the following equation for the reaction of magnesium hydroxide [Mg(OH)2] with phosphoric acid (H3PO4).
Mg(OH)2 + H3PO4 →H2O + Mg3(PO4)2 (not balanced)
When the equation is balanced, how many Mg(OH)2 formula units are needed to react with six H3PO4 molecules?
6
1.5
9
1
In the reaction 2 H2(g) + O2(g) → 2 H2O(g), with all substances at the same temperature and pressure, the ratio of volumes, for H2, O2, and H2O, respectively, is
1:0:1
2:1:2
1:1:1
2:0:2
How many CO2 molecules are produced in the following reaction if 75 O2 molecules react?
2 C8H18(l) + 25 O2(g) → 16 CO2(g) + 18 H2O(l)
48 molecules
32 molecules
100 molecules
50 molecules
In the reaction N2(g) + 3 H2(g) → 2 NH3(g), with all substances at the same temperature and pressure, what volume of ammonia is produced when 4.50 L of nitrogen reacts with excess hydrogen?
4.50 L
6.75 L
3.00 L
9.00 L
How many oxygen-16 atoms are there in exactly 16 g of oxygen-16?
1
16
256
6.02 × 1023
The mass of 1 mol of carbon-12 atoms is
12.011 amu
12 g
12.011 g
12 amu
Which of the following has the smallest molecular mass?
HCl
CH4
PH3
H2O
How many moles of sulfur atoms are in 1 mol Cr(SO4)3?
3 mol
6.02 × 1023 mol
1 mol
15 mol
How many moles of hydrogen atoms are present in 2.00 mol of water H2O?
2.00 mol
4.00 mol
6.00 mol
8.00 mol
Sodium chloride, by mass, is
23.0% Na+ and 35.5% Cl−
about 60% Na+ and 40% Cl−
50% Na+ and 50% Cl−
about 40% Na+ and 60% Cl−
The mass of 4.65 mol H2SO4 is
466 g
314 g
564 g
456 g
For which of the following would a 10.0 g sample contain the most moles?
Co
P
F
Se
How many moles of CO2 are there in 1 lb. (453.6 g) CO2?
0.0969 mol
9.20 mol
14.2 mol
10.3 mol
How many moles of benzene (C6H6) are there in a 7.80 g sample of benzene?
610 mol
1.00 mol
0.100 mol
7.81 mol
Refer to the equation 2 H2 + O2 → 2 H2O.
At the molar level, the equation means that
2 mol H2 reacts with 1 mol O2 to form 2 mol H2O
2 mol O2 reacts with 1 mol H2 to form 2 mol H2O
4 mol H reacts with 2 mol O to form 4 mol H2O
2 mol H reacts with 1 mol O to form 2 mol H2O
Refer to the equation 2 H2 + O2 → 2 H2O.
How many moles of water can be formed from 0.500 mol H2?
1.00 mol
2.00 mol
4.00 mol
0.500 mol
Refer to the equation 2 H2 + O2 → 2 H2O.
How many moles of oxygen (O2) are required to form 0.222 mol H2O?
1.00 mol
0.222 mol
0.111 mol
0.444 mol
In a solution of 85.0 g water and 5.0 g sucrose (C12H22O11), the
solute is sucrose and the solution is the solvent
solute is water and sucrose is the solvent
solute is sucrose and the solvent is water
water and sucrose are both solutes
What is the molarity of a sodium hydroxide solution having 0.500 mol NaOH in 62.5 mL of solution?
0.00200 M
2.00 M
0.200 M
8.00 M
How many moles of sugar are required to make 2.00 L of 0.600 M sugar solution?
1.20 mol
6.67 mol
24.0 mol
2.40 mol
What mass of NaCl in grams is needed to prepare 2.500 L of a 0.800 M NaCl solution?
4.00 g
117 g
2.00 g
58.5 g
What volume of 6.00 M HCl solution contains 1.80 mol HCl?
300 mL
900 mL
250 mL
9.00 L
What is the percent by volume of ethanol in a solution made by adding 50.0 mL of pure ethanol to enough water to make 250 mL of solution?
20.0%
25.0%
80.0%
16.7%
A solution contains 15.0 g sucrose and 60.0 g of water. What is the percent by mass of sucrose in the solution?
15.0%
80.0%
20.0%
25.0%
To make 100.0 mL of 4.00 M NaCl solution, you would take 23.4 g NaCl and
add 100.0 mL of water
add 76.6 mL of water
add 76.6 g of water
add water until the solution volume reached 100.0 mL
