Rates of Reaction

In the reaction between magnesium ribbon and hydrochloric acid,which aspect of the reaction can be used to measure its rate?Select one answer.

• The production of a colourless gas

• The darkening of the magnesium ribbon

• The production of a white precipitate

• The reduction in the volume of liquid

In an experiment to measure the rate of reaction of calciumcarbonate and hydrochloric acid, the reactants were put in a conical flaskon a digital balance and the mass lost every minute was noted.The results were plotted on the graph. How long did it take to produce 1.8 g of carbon dioxide?

• 2.5 minutes

• 1.5 minutes

• 4 minutes

• 3 minutes

There are four products of the reaction between sodium thiosulfate and hydrochloric acid.Match each of them to their state on completion of the reaction.

• In solution

• Water

• Gas

• Sulfur dioxide

• Solid

• Sulfur

• Liquid

• Sodium chloride

In a reaction between magnesium ribbon and hydrochloric acid, agas was collected in a gas syringe and the volume noted over time.The results were plotted on the graph:Match the following

• 20 seconds

• 22 cm³

• 30 seconds

• 18.5 cm³

• 40 seconds

• 15.2 cm³

• 10 seconds

• 20.2 cm³

Which of the following are ways of measuring the rate of a reaction?

• Time taken for a reaction to go to completion

• Time taken for a reaction to go to completion

• Volume of gas produced over time

• Volume of gas produced over time

In the reaction between sodium thiosulfate and hydrochloric acid,which two of the following turn the solution cloudy?

• Sodium chloride

• Water

• Sulfur

• Sulfur dioxide

What is the limiting reactant?

• The reactant that interacts with a catalyst to increase the rate of reaction

• The reactant that is still present when the reaction stops

• The reactant whose bonds are most difficult to break

• The reactant that is used up when the reaction stops

Iron oxide and aluminium react to produce aluminium oxide andiron:

Fe₂O₃ + 2Al → Al₂O₃ + 2Fe

The relative atomic masses of the constituents are

Fe:56,

O:16,

Al:27

If 10.8 g of aluminium is heated with an excess of iron oxide, how manygrams of aluminium oxide will be produced?

Mathematical Equivalence

ON

A student puts 1.2 g of magnesium ribbon into a flask of 100 cm³ of1.00 mol dm-3 hydrochloric acid.1.12 dm³ of hydrogen gas is produced and, at the end of the reaction, the flask contains only magnesium chloride dissolved in water; there is no magnesium or hydrochloric acid left. Using this data, match the following quantities of reactant to the volumeof hydrogen produced.Match the following

• 1.68 dm³

• 1.8 g Mg;

  200 cm³ HCl

• 2.24 dm³

• 1.2 g Mg;

  25 cm³ HCl

• 0.28 dm³

• 0.6 g Mg;

  50 cm³ HCl

• 0.56 dm³

• 2.4 g Mg;

  200 cm³ HCl

The relative atomic masses of carbon, oxygen and hydrogen areC:12, O:16, H:1.Match the molecule to its relative molecular mass.

• 60

• C₃H₆

• 58

• C₂H₅OH

• 46

• C₄H10

• 42

• CH₃COOH