GCSE Chemistry 4

Question 1

Which factor does NOT increase the rate of a chemical reaction?

Accepted Answer

Decreasing concentration of reactants

Answer

Decreasing the concentration of reactants reduces the frequency of collisions, thereby slowing the reaction rate.

Question 2

What is the name of the process by which plants convert carbon dioxide and water into glucose using sunlight?

Accepted Answer

Photosynthesis

Answer

Photosynthesis is the process in which plants use light energy to convert CO2 and water into glucose and oxygen.

Question 3

In a reversible reaction at equilibrium, what does Le Chatelier's principle predict if pressure is increased?

Accepted Answer

The reaction shifts to the side with fewer moles of gas

Answer

Le Chatelier's principle states that increasing pressure shifts equilibrium toward the side with fewer moles of gas to reduce pressure.

Question 4

Which of the following is the correct electron configuration for a sodium atom (atomic number 11)?

Accepted Answer

2, 8, 1

Answer

Sodium has 11 electrons arranged as 2 in the first shell, 8 in the second, and 1 in the third shell.

Question 5

What product forms at the anode during the electrolysis of copper sulfate solution using copper electrodes?

Accepted Answer

The copper anode dissolves into solution

Answer

With copper electrodes, the copper anode dissolves (oxidises) as copper atoms lose electrons and enter the solution.

GCSE - General Certificate of Secondary Education Practice Test