GCSE|Edexcel| Chemistry P1F (Nov 2020)

When solid sodium chloride is mixed with water, sodium chloride solution forms. What name is given to the process of mixing a solid with water to form a solution?

• crystallising

• diluting

• dissolving

• melting

Sodium reacts with hydrochloric acid to form sodium chloride and hydrogen.

Write the word equation for this reaction.

The hazard symbol shown in Figure 1 is used on containers of sodium.

• corrosive

• flammable

• oxidising

• toxic

Hydrogen has one electron in its electron shell. Figure 2 shows the incomplete dot and cross diagram of a hydrogen molecule.

Complete Figure 2 to show the electrons in the covalent bond between the two atoms of hydrogen.

The pH of a sodium chloride solution was measured.

State what could be used to measure the pH of a solution.

Sodium chloride solution is neutral.

Give the pH of this solution.

Chlorine has an atomic number of 17.

What is the electronic configuration of this atom?

• 10.7

• 17

• 2.8.7

• 7.8.2

Explain, using Figure 3, why chlorine belongs to group 7 of the periodic table.

Explain, using the information in Figure 4, why atoms of chlorine have no overall charge.

Atoms of chlorine-37 have a mass number of 37. Calculate the number of neutrons in atoms of chlorine-37.