Unit 8 Stoichiometry Review
Quiz
•
Chemistry
•
9th Grade
•
Practice Problem
•
Hard
Viri Garcia
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17 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
According to the following balanced chemical equation, which molar ratio is consistent with the chemical equation based on the stoichiometric coefficients?
3 KOH + FeCl3 → Fe(OH)3 + 3 KCl
1 mol KOH : 1 mol Fe(OH)3
1 mol KOH : 1 mol KCl
3 mol FeCl3 : 1 mol KCl
1 mol FeCl3 : 3 mol Fe(OH)3
Answer explanation
If the coefficients are EQUAL (for exmample 1:1, 2:2, 3:3) then they are also 1:1
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
When silver nitrate (AgNO3) reacts with hydrochloric acid (HCl), silver chloride (AgCl) precipitates out of solution. What is the stoichiometric coefficient of HCl in the balanced chemical equation?
AgNO3 + HCl → AgCl + HNO3
1
2
3
4
3.
MULTIPLE CHOICE QUESTION
2 mins • 5 pts
A mixture of CO(g) and O2(g) is placed in a rigid, sealed container as shown in the particle diagram above. The CO(g) reacts with the O2(g) according to the following reaction. 2CO(g) + O2(g) → 2CO2(g). Which of the following diagrams correctly illustrates the reaction mixture after the reaction goes to completion?
Diagram A
Diagram B
Diagram C
Diagram D
4.
MULTIPLE CHOICE QUESTION
5 mins • 10 pts
Balance the chemical equation below using coefficients. The stoichiometric coefficient for oxygen gas is...
___ NH3(l) + ___ O2(g) → ___ NO2(g) + ___ H2O(l)
HINT: (Start by trying to balance hydrogen first. You may need to double some coefficients...)
1
4
6
7
5.
MULTIPLE CHOICE QUESTION
5 mins • 5 pts
What mass of dissolved HCl is needed to completely react with 1 mole of solid Mg?
Mg(s) + 2 HCl(aq) → MgCl2(aq) + H2(g)
(Hint: Use the stoichiometry map. What units do they give us, what are they asking us for, and what path do we take?)
72.92 g
18.3 g
24.3 g
48.6 g
6.
MULTIPLE CHOICE QUESTION
1 min • 10 pts
When 10.0 grams of magnesium react with excess hydrochloric acid, investigators expected to collect 39.2 g of magnesium chloride. Instead, the investigators only collected 30.0 grams of magnesium chloride. What is the percent yield of this experiment?
25.5%
33.0%
76.5%
131%
7.
OPEN ENDED QUESTION
3 mins • 10 pts
If the reaction produces 0.400 L of 1.5 M MgCl2, which setup shown will correctly calculate how many grams of HCl reacted with excess solid magnesium? (Type A, B, C, or D)
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