Stoichiometry Showdown

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Test your knowledge of stoichiometry with these challenging questions!

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Alexis Stuebe

United States

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Stoichiometry Showdown


Froggy Jumps Stoichiometry ShowdownOnline version Test your knowledge of stoichiometry with these challenging questions! by Alexis Stuebe 1 What is stoichiometry primarily concerned with? a The types of chemical bonds. b The quantitative relationships in chemical reactions. c The physical properties of substances. 2 In a balanced equation, what do the coefficients represent? a The number of moles of each substance. b The mass of each substance. c The volume of each gas. 3 What is the mole ratio in the reaction 2H₂ + O₂ → 2H₂O? a 2:1:2 b 1:2:1 c 1:1:2 4 How do you convert grams to moles? a Add the molar mass. b Multiply by the molar mass. c Divide the mass by the molar mass. 5 What is the molar mass of water (H₂O)? a 18 g/mol b 16 g/mol c 20 g/mol 6 What is the first step in stoichiometric calculations? a Write a balanced chemical equation. b Calculate the pressure. c Measure the temperature. 7 What does the law of conservation of mass state? a Mass can be created in reactions. b Mass is neither created nor destroyed in a chemical reaction. c Mass is only conserved in physical changes. 8 In stoichiometry, what does 'limiting reactant' refer to? a The reactant that runs out first and limits the product formation. b The reactant that is in excess. c The product that forms the least. 9 What is the purpose of a stoichiometric calculation? a To measure the pressure of gases. b To find the temperature of the reaction. c To determine the amounts of reactants and products involved. 10 What unit is commonly used to express the amount of substance? a Gram b Mole c Liter 11 How many moles of water are produced when 2 moles of hydorgen gas react with 1 mole of oxygen? a 1 mole b 2 moles c 3 moles 12 A reaction has a theoretical yield of 20 grams of product. If only 15 grams of the product are produced, what is the percent yield? a 75% b 60% c 25% 13 Theoretical yield refers to: a The amount of product you actually obtain from the reaction. b The maximum amount of product that can be formed from given reactants. c The maximum amount of excess reactant remaining after the reaction. 14 H2SO4 + 2NaOH --> Na2SO4 + 2H2O What mass of H2SO4 would be required to react with 0.75 mol of NaOH? a 54.0 grams b 73.6 grams c 36.8 grams 15 Sn + 2HF --> SnF2 + H2 How many moles of HF will be needed to react with 48 grams of Tin, Sn? a 0.81 moles b 2.0 moles c 1.05 moles

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Stoichiometry Showdown

Froggy Jumps

About this activity

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Stoichiometry ShowdownOnline version

by Alexis Stuebe

What is stoichiometry primarily concerned with?

In a balanced equation, what do the coefficients represent?

What is the mole ratio in the reaction 2H₂ + O₂ → 2H₂O?

How do you convert grams to moles?

What is the molar mass of water (H₂O)?

What is the first step in stoichiometric calculations?

What does the law of conservation of mass state?

In stoichiometry, what does 'limiting reactant' refer to?

What is the purpose of a stoichiometric calculation?

What unit is commonly used to express the amount of substance?

How many moles of water are produced when 2 moles of hydorgen gas react with 1 mole of oxygen?

A reaction has a theoretical yield of 20 grams of product. If only 15 grams of the product are produced, what is the percent yield?

Theoretical yield refers to:

H2SO4 + 2NaOH --> Na2SO4 + 2H2O What mass of H2SO4 would be required to react with 0.75 mol of NaOH?

Sn + 2HF --> SnF2 + H2 How many moles of HF will be needed to react with 48 grams of Tin, Sn?