Changing the concentration of the reactants

State what happens to the rate of a reaction if the concentration of a reactant is increased, assuming all other conditions remain the same.

A student dilutes 10.0 cm³ of 2.00 mol/dm³ sodium thiosulfate solution by adding water to make a total volume of 50.0 cm³.

In an experiment, 0.27 g of oxygen gas is produced in 45 seconds during the reaction of hydrogen peroxide with manganese(IV) oxide. Calculate the average rate of oxygen production during this time. Give your answer in g/s.

A graph plots the rate of a chemical reaction against the concentration of a reactant. The graph is a straight line that passes through the origin. Explain what this tells you about the relationship between the rate of the reaction and the concentration of the reactant.

The table gives the results from an experiment measuring the rate of a reaction at two different concentrations of sulfuric acid.

A student mixes 16.0 cm³ of 1.50 mol/dm³ hydrochloric acid with water to make 40.0 cm³ of solution. State the concentration of hydrochloric acid after dilution, leaving your answer as a formula or calculation.

In an experiment, 0.40 g of carbon dioxide is produced in the first 50 seconds during a reaction between calcium carbonate and hydrochloric acid.

A student plots a graph showing the initial rate of reaction versus concentration of a reactant. At 0.80 mol/dm³, the rate is 0.011 g/s. Predict the rate if the concentration is increased to 1.60 mol/dm³, assuming the rate is directly proportional to concentration.