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Year 11 Exam  >  Year 11 Tests  >  Chemistry for GCSE/IGCSE  >  Test: Stoichiometry - Year 11 MCQ

Test: Stoichiometry - Year 11 MCQ


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10 Questions MCQ Test Chemistry for GCSE/IGCSE - Test: Stoichiometry

Test: Stoichiometry for Year 11 2024 is part of Chemistry for GCSE/IGCSE preparation. The Test: Stoichiometry questions and answers have been prepared according to the Year 11 exam syllabus.The Test: Stoichiometry MCQs are made for Year 11 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Stoichiometry below.
Solutions of Test: Stoichiometry questions in English are available as part of our Chemistry for GCSE/IGCSE for Year 11 & Test: Stoichiometry solutions in Hindi for Chemistry for GCSE/IGCSE course. Download more important topics, notes, lectures and mock test series for Year 11 Exam by signing up for free. Attempt Test: Stoichiometry | 10 questions in 20 minutes | Mock test for Year 11 preparation | Free important questions MCQ to study Chemistry for GCSE/IGCSE for Year 11 Exam | Download free PDF with solutions
Test: Stoichiometry - Question 1
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Sometimes athletes take drugs to enhance their performance. One such drug is ephedrine which has the formula C10H15NO. What is the molecular mass of ephedrine?

Detailed Solution for Test: Stoichiometry - Question 1

Total carbon = 10 x 12 = 120. Total hydrogen = 15 x 1 = 15. Total nitrogen = 14 x 1 = 14. Total oxygen = 16 x 1 = 16. Add together = 165 amu

Test: Stoichiometry - Question 2
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Amphetamine, another drug, has the formula C9H13N. The molecular mass is 135 amu. Calculate the percentage by mass of hydrogen in amphetamine.

Detailed Solution for Test: Stoichiometry - Question 2

Remember, be methodical. There are 13 hydrogen atoms in the molecule so they contribute 13 x 1 =13 amu to the total. To work this out as a percentage:13 /135 = 0.096 x 100 = 9.6%

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Test: Stoichiometry - Question 3
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A substance used as a cosmetic by the Ancient Egyptians has been analysed. It was found to contain 76% lead, 13% chlorine, 2.2% carbon and 8.8% oxygen. Calculate the empirical formula of this compound.

Detailed Solution for Test: Stoichiometry - Question 3

Divide the % by RAM for each individual element. Divide those answers by the smallest which will give you your final ratios

Test: Stoichiometry - Question 4
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How is the mole ratio determined in stoichiometry?
Detailed Solution for Test: Stoichiometry - Question 4

The mole ratio is determined by dividing the coefficients of reactants and products in a balanced chemical equation.

Test: Stoichiometry - Question 5
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Calculate the % by mass of fluorine in sodium fluoride.
Detailed Solution for Test: Stoichiometry - Question 5
19/42 x 100 = 45%. You can check this by calculating the percentage by mass of sodium - this gives 55%. 55 + 45 = 100%
Test: Stoichiometry - Question 6
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A tube of toothpaste contains 1.5 g of sodium fluoride. Calculate the mass of sodium in this tube of toothpaste.
Detailed Solution for Test: Stoichiometry - Question 6
Again you MUST remember your units. The quick way to this answer is to use the answer to the previous question. 55% of NaF is sodium. 55% of anything is 0.55 so 1.5 x 0.55 gives you the correct answer
Test: Stoichiometry - Question 7
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Calcium hypochlorite tablets are added to swimming pools to kill microorganisms. The formula of calcium hypochlorite is CaCl2O2. Calculate the relative formula mass of calcium hypochlorite.
Detailed Solution for Test: Stoichiometry - Question 7

40 + 2 x 35.5 + 2 x 16 = 143 amu

Test: Stoichiometry - Question 8
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What is the definition of stoichiometry in chemistry? 
Detailed Solution for Test: Stoichiometry - Question 8

Stoichiometry is the calculation of quantities of substances involved in chemical reactions based on balanced equations.

Test: Stoichiometry - Question 9
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In a chemical reaction, which term represents the starting substances that undergo change?
Detailed Solution for Test: Stoichiometry - Question 9

Reactants are the substances present at the start of a chemical reaction that undergo change to form products.

Test: Stoichiometry - Question 10
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What does a balanced chemical equation ensure? 
Detailed Solution for Test: Stoichiometry - Question 10

A balanced chemical equation ensures the conservation of atoms of each element in the reactants and products.

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Important Questions for Stoichiometry

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Stoichiometry MCQs with Answers

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