GCSE Chemistry – Reacting masses

Last updated: 13/04/2020
GCSE Science CIE – Combined science extended Stoichiometry GCSE Chemistry – Reacting masses

Learning Objectives

-I can calculate the mass of a reactant or a product given the equation
-I can balance an equation given information about the number of moles involved
-I can describe when a reactant would be used in excess

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  1. What is the state symbol for a solid?

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  2. What is the state symbol for a liquid?

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  3. What is the state symbol for a gas?

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  4. What is the state symbol for an aqueous substance?

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  5. What is the definition of a limiting reactant?

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  6. In order to find the limiting reactant of a reaction, what should be found?

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  7. How can the limiting reactant of a reaction be picked?

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  8. What can be found when the masses of a reaction has been provided?

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  9. What type of numbers should generally be used when writing a balanced equation?

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  10. Write the balanced equation for the reaction between calcium and hydrochloric acid.

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  11. For the reaction between calcium and hydrochloric acid, 4.5 grams of calcium is used. Work out the number of moles of calcium.

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  12. For the reaction between calcium and hydrochloric acid, 3.25 grams of hydrochloric acid is used. Work out the number of moles of hydrochloric acid.

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  13. Given that for the reaction between calcium and hydrochloric acid, 4.5 grams of calcium is used and 3.25 grams of hydrochloric acid is used, which reactant is the limiting reagent?

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  14. Given that for the reaction between calcium and hydrochloric acid, 4.5 grams of calcium is used and 3.25 grams of hydrochloric acid is used, which reactant is in excess?

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