Stoichiometry ShowdownVersion en ligne Test your knowledge of stoichiometry calculations in this fun quiz game! par Junidah Lamaming 1 What is stoichiometry primarily concerned with? a The quantitative relationships in chemical reactions. b The physical state of matter. c The color changes in reactions. d The speed of chemical reactions. 2 In a balanced chemical equation, what do the coefficients represent? a The mass of each substance. b The volume of each substance. c The temperature of the reaction. d The number of moles of each substance. 3 What is the first step in performing stoichiometry calculations? a Write a balanced chemical equation. b Measure the temperature. c Identify the products only. d Count the atoms. 4 How do you convert grams to moles in stoichiometry? a Add the molar mass. b Subtract the molar mass. c Multiply by the molar mass. d Divide by the molar mass. 5 What is the mole ratio used for in stoichiometry? a To determine reaction rates. b To measure temperature changes. c To relate the amounts of reactants and products. d To calculate energy changes. 6 If you have 2 moles of A reacting with 3 moles of B, what is the mole ratio of A to B? a 1:2 b 2:3 c 3:2 d 1:1 7 What is the purpose of a limiting reactant in stoichiometry? a To measure temperature. b To balance the equation. c To determine the maximum amount of product formed. d To increase the reaction rate. 8 What does the term 'excess reactant' refer to? a The reactant that remains after the reaction. b The reactant that is completely consumed. c The catalyst used in the reaction. d The product formed in excess. 9 How can you find the theoretical yield in a reaction? a Using stoichiometric calculations from the balanced equation. b By counting the molecules. c By estimating based on temperature. d By measuring the actual yield. 10 What is the significance of the molar mass in stoichiometry? a It shows the color of the compounds. b It indicates the speed of a reaction. c It measures the pressure in a reaction. d It allows conversion between grams and moles.
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