Chemistry P2 0620 practice

A gaseous substance is slowly cooled and the temperature recorded every second. At which point is the substance a solid?

• A

• B

• C

• D

Which statement describes the bonding in sodium chloride?

• A shared pair of electrons between two atoms leading to a noble gas configuration.

• A strong force of attraction between oppositely charged ions.

• A strong force of attraction between two molecules.

• A weak force of attraction between oppositely charged ions.

Which row about elements, mixtures and compounds is correct?

• A

• B

• C

• D

Which statement explains why isotopes of the same element have the same chemical properties?

• They have the same number of outer shell electrons.

• They have the same number of neutrons.

• They have different numbers of protons.

• They have different mass numbers.

Nitrogen forms a nitride ion with the formula N^3-. Which particle does not have the same electronic configuration as the nitride ion?

• Al³⁺

• Cl^-

• Na⁺

• O^2-

Which statement about metals is not correct?

• They conduct electricity because delocalised electrons can move throughout the metal.

• They consist of layers of atoms that can slide over each other.

• They have a giant lattice of oppositely charged ions in a ‘sea’ of delocalised electrons

• They have a giant lattice of positive ions in a ‘sea’ of delocalised electrons.

Which information is needed to calculate the relative atomic mass of an element?

• The total number of protons and neutrons in the most abundant isotope.

• The nucleon numbers and the total number of isotopes.

• The mass number and abundance of each of its isotopes.

• The atomic number and abundance of each of its isotopes.

Which formula is an empirical formula?

• C2H4O

• C4H8O2

• C3H7COOH

• CH3CH2CH2COOH

Heating iron sulfide, FeS₂, in air produces sulfur dioxide.

4FeS₂ + 11O₂ → 2Fe₂O₃ + 8SO₂

What is the maximum mass of sulfur dioxide produced from 120 kg of iron sulfide?

• 64kg

• 128kg

• 240kg

• 512kg

The equation for the reaction is shown.

2NaOH + H₂SO₄ → Na₂SO₄ + 2H₂O

The reaction requires 50.0 cm³ of dilute sulfuric acid to reach the end-point. The concentration of NaOH is 2.0 mol/dm³.

What is the concentration of the dilute sulfuric acid in mol/dm³?

• 0.50 mol/dm³

• 1.00 mol/dm³

• 2.00 mol/dm³

• 4.0 mol/dm³