GCSE Chemistry 2

Question 1

Which type of bonding involves the sharing of electrons between two non-metal atoms?

Accepted Answer

Covalent bonding

Answer

Covalent bonding occurs when two non-metal atoms share pairs of electrons to achieve stable electron configurations.

Question 2

What is the chemical formula for sulfuric acid?

Accepted Answer

H2SO4

Answer

Sulfuric acid has the formula H2SO4, containing two hydrogen atoms, one sulfur atom, and four oxygen atoms.

Question 3

During electrolysis of brine (sodium chloride solution), what is produced at the cathode?

Accepted Answer

Hydrogen gas

Answer

At the cathode (negative electrode), hydrogen ions from water are discharged, producing hydrogen gas.

Question 4

Which of the following is an example of an exothermic reaction?

Accepted Answer

Combustion of methane

Answer

Combustion of methane releases energy to the surroundings, making it an exothermic reaction.

Question 5

What does the term 'mole' represent in chemistry?

Accepted Answer

6.02 × 10²³ particles

Answer

One mole contains 6.02 × 10²³ particles (Avogadro's number), allowing chemists to count atoms and molecules by mass.

GCSE - General Certificate of Secondary Education Practice Test