In an experiment, a 2 g lump of zinc and 2 g of powdered zinc are added separately to equal volumes of dilute sulfuric acid.The solid line on the graph shows the volume of gas given off when the 2 g lump is used.

Which dotted line is obtained when the zinc is powdered?

In an experiment, a 2 g of powdered zinc are added separately to two samples of equal volumes of dilute sulfuric acid and hydrochloric acid of the same concentration. The solid line on the graph shows the volume of gas given off when sulfuric acid is used. Excess zinc powder is used.

Which dotted line is obtained when the hydrochloric acid is used?

In an experiment, powdered calcium carbonate are added separately to two samples of equal volumes of dilute sulfuric acid of 1.0 mol/dm³ and 2.0 mol/dm³. The solid line on the graph shows the volume of gas given off when 1.0 mol/dm³ sulfuric acid is used. Acid is in excess.

Which dotted line is obtained when the 2.0 mol/dm³ sulfuric acid is used?

An experiment was conducted for the reaction below between excess calcium carbonate and 100.0 cm³ of hydrochloric acid.

CaCO₃(s) + 2HCl (aq) → 2CaCl₂(aq) + H₂O(l) + CO₂(g)

Which factor(s) would cause a greater decrease in mass?

Examine the graph for an experiment involving the collection of a carbon dioxide over time. Trials I and II were for the same reaction, but under different conditions.

Calculate the average rate of reaction, in cm³ s⁻¹, for Trial I for the first 5 seconds of the reaction. Give the answer to one significant figure and units are not required in the answer. 

Identify which of the following units would not be appropriate for expressing the rate of a reaction.

A student wants to measure the effect of surface area on the reaction of calcium carbonate with dilute hydrochloric acid. The student performs the experiment several times, using the same mass of iron but changing its surface area. How does the surface area affect the total amount of CO2 gas produced?

The graph below shows how the concentration of a reactant in four different reactions changes over time. Which reaction is the slowest?

The graph below shows how the concentrations of reactants and products change during a chemical reaction. Which of the chemical species is likely to be the reactant?

In an experiment, a student added a sample of a solid into a solution, resulting in a chemical reaction. The student repeated the experiment 5 times but changed the surface area of the solid. The graph showing how the concentration of one of the products changes over time for each experiment is shown. In which experiment was the surface area of the solid the greatest?

Which graph shows the effect of increasing temperature on the rate of reaction of calcium carbonate with dilute hydrochloric acid?