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SQA Higher Chemistry Formulae and equations

Formulae and equations

This page covers the following topics:

1. Limiting reactants

The limiting reactant is the first reactant to be used up in a chemical reaction. When the limiting reactant is used up, the reaction stops and no more of the product can be formed. Therefore, the mass of the product is dependent on the mass of the limiting reactant. The left-over reactant is referred to as the reactant in excess.

Limiting reactants

1

14.5 g of ammonia are reacted with 7.2 g of oxygen to produce nitric oxide and water. Which reactant is in excess?

14.5 g of ammonia are reacted with 7.2 g of oxygen to produce nitric oxide and water. Which reactant is in excess?

2

2.5 g of zinc are reacted with 9.8 g of hydrogen chloride. Which is the limiting reactant?

2.5 g of zinc are reacted with 9.8 g of hydrogen chloride. Which is the limiting reactant?

3

Which is the limiting reactant in the reaction of 9.6 g of nitrogen with 6 g of hydrogen?

Which is the limiting reactant in the reaction of 9.6 g of nitrogen with 6 g of hydrogen?

4

5.7 g of sodium are reacted with 6.1 g of sulfur. Which is the limiting reactant and which reactant is in excess?

5.7 g of sodium are reacted with 6.1 g of sulfur. Which is the limiting reactant and which reactant is in excess?

5

38 g of zinc sulfide are reacted with 16 g of oxygen, producing zinc oxide and sulfur dioxide. Calculate the limiting reactant and the reactant in excess.

38 g of zinc sulfide are reacted with 16 g of oxygen, producing zinc oxide and sulfur dioxide. Calculate the limiting reactant and the reactant in excess.

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