Chemistry Stoichiometry Percent Yield

Chemistry Stoichiometry Percent Yield

10th Grade

15 Qs

quiz-placeholder

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Chemistry Stoichiometry Percent Yield

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Assessment

Quiz

Science

10th Grade

Hard

NGSS
HS-PS1-7

Standards-aligned

Created by

Lisa Thompson

FREE Resource

15 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Cl2 + 2 KBr → Br2 + 2 KCl
How many grams of potassium chloride can be produced from 356 g of chlorine and 356 g of potassium bromide?

749 g

223 g

479 g

814 g

Answer explanation

Media Image

When given 2 values, you must first determine the limiting reactant. Then you must do the conversion/stoichiometry using the starting amount of the limiting reactant.

Tags

NGSS.HS-PS1-7

2.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

B2H6 + 3O2 -->2 HBO2 + 2 H2O
 What mass of O2 will be needed to burn 36.1 g of B2H6?

13.8 g O2

3.86 mol of O2

125 g O2

Answer explanation

Media Image

3.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

CO (g) + O2(g) → 2 CO2 (g)
In the formation of CO2 from CO and oxygen, how many Liters of CO2 are produced by the reaction of 8 mols of O2 with an excess of carbon monoxide?

0.178 L

358.4 Liters

704 grams

0.36 grams

Answer explanation

Media Image

The actual answer is 358.4, but due to sig. figs. it must be rounded up to 400 L.

4.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Using the following balanced equation: Fe2O3(s) + 3H2(g) → 2Fe(s) + 3H2O(l) How many moles of iron can be made from 6.0 moles H2 assuming there is excess Fe2O3?

4.0 moles Fe

6.0 moles Fe

9.0 moles Fe

2.0 moles Fe

5.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Before performing a lab, a scientist calculates that a reaction should produce 12.3 grams of product in an experiment. When the reaction is performed, the product has a mass of 10.1 grams. What is the percent yield?

82.1 %

17.9 %

122 %

1.22 %

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Media Image

What would be the correct numbers of products and leftovers? (In the order shown for the chemicals in the image)

4, 6, 6, 1

2, 3, 7, 4

2, 3, 1, 3

4, 6, 2, 5

Tags

NGSS.HS-PS1-7

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

When calculating the percent yield, what is the measured amount of a product obtained from a chemical reaction?

mole ratio

theoretical yield

percentage yield

actual yield

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