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Practice Test
Name: _____________________________ Date: _______________________ Period: ________
For each problem below that requires calculations:
- Draw your MVP Spider. 2. Label your given and unknown. 3. Circle your starting and end “dots” on the spider and trace the path needed. 4. Circle your final answer.
Reminders: Each dot is a step in the solution. Each dot is also the units to put in the top boxes in your setup. Your diagonal units must match to cancel. If you need grams, use the periodic table. Also, recall that 1 mol of a gas = 22.4 L.
- Aluminum Oxide is formed when aluminum combines with oxygen in the air. How many grams of Al 2 O 3 are formed when 23.6g of Al reacts completely with oxygen?
4 Al + 3 O 2 2 Al 2 O 3
A. 44.6 grams
B. 35.6 grams
C. 87.6 grams
D. 21.6 grams
- Boron carbonate decomposes into boron oxide and carbon dioxide. How many moles of CO 2 are produced when 5.0 mol of boron carbonate decomposes completely?
1 B 2 (CO 3 ) 3 1 B 2 O 3 + 3 CO 2
A. 15 mol
B. 1.67 mol
C. 5 mol
D. 8 mol
- How many liters of fluorine gas can be produced when 0.67 L of HF reacts with excess O 2 at STP (standard temperature and pressure; normal conditions)?
4 HF + 1 O 2 2 F 2 + 2 H 2 O
A. 0.67 L
B. 2.68 L
C. 0.335 L
D. 1.34 L
Practice Test
- How many liters of O 2 at STP will react with 8.7 grams of C 2 H 4 to form CO 2 and H 2 O?
1 C 2 H 4 + 3 O 2 2 CO 2 + 2 H 2 O
A. 20.88L
B. 2.32 L
C. 22.4 L
D. 6.54 L
- Using the equation in question number 4, what is the mole ratio of carbon dioxide to oxygen?
A. 1:
B. 3:
C. 2:
D. 2:
- A student is trying to figure out how many moles of potassium chloride are made from 4.0 grams of chlorine gas. Which step in the student’s work below is incorrect?
2 K + Cl 2 2 KCl
𝟏 ×
𝟕𝟎. 𝟗𝟏𝟓 𝐠 𝐂𝐥𝟐^ ×
A. Step 1 B. Step 2 C. Step 3 D. There is no mistake
- How many moles of H 2 O are produced from 3 moles of oxygen? 2 H 2 + O 2 2 H 2 O
A. 3 moles B. 1.5 moles C. 12 moles D. 6 moles
Step 1 Step 2 Step 3
Practice Test
- Using the equation in number 11, what is the mole ratio of carbon monoxide reacting to the amount of carbon dioxide being produced? A. 3: B: 2: C. 3: D. 3:
- A student wants to know how many grams of water are made from 5.00 g oxygen gas. Which step should be substituted for the question marks?
2 H 2 + O 2 2 H 2 O
𝟓. 𝟎 𝐠 𝐎𝟐 𝟏
×
×
×
A. (^) 1.0 mole O18 g H^2 O 2
B. 2.0 mole H1.0 mole O^22 O
C. (^) 2.0 mole H18 g H^2 O 2 O
D. (^) 2.0 mole H2.0 mole O^2 2 O
- Stoichiometry is possible due to _________.
A. Newton’s three laws of motion
B. Law of Conservation of Mass
C. Law of Molarity
D. Law of Scientific Principles
- What is the limiting reactant if 20.0 moles of O 2 react with 30.0 moles of H 2 according to the following reaction?
2 H 2 + O 2 2 H 2 O
A. H 2
B. O 2
C. Both A and B.
D.H 2 O
Practice Test
Short Answer:
Aluminum bromide can be prepared by the reaction of aluminum metal with bromine gas shown by the equation:
2 Al + 3 Br 2 2 AlBr 3
Now suppose that 5.6 mol of aluminum reacts with 4.4 mol of bromine.
- Calculate the mass of aluminum bromide that can be produced from 5.6 mol of Al.
- Calculate the mass of aluminum bromide that can be produced from 4.4 mol of bromine.
- Based off of your final answers for 1 and 2 above:
The limiting reactant is _________________________.
The excess reactant is __________________________.
The actual amount of product produced is __________________________.
