Topic 2 Practice Paper: Atoms, elements and compounds — question paper

Section A: Multiple-choice questions[10 marks]

Choose one answer for each question. Each question is worth 1 mark.

1. 1

   Which of the following is a mixture?

   1. ACarbon dioxide
   2. BBrass
   3. CWater
   4. DMethane
   ( )
2. 2

   An electron has a relative charge of

   1. A−1
   2. B0
   3. C+1
   4. D+2
   ( )
3. 3

   Which particle is found in the nucleus and has no charge?

   1. AElectron
   2. BProton
   3. CNeutron
   4. DIon
   ( )
4. 4

   The electronic configuration of an atom is 2,8,7. In which group is the element?

   1. AGroup I
   2. BGroup VII
   3. CGroup VIII
   4. DPeriod 7
   ( )
5. 5

   An atom has 17 protons and 18 neutrons. Which atom is an isotope of it?

   1. AAn atom with 18 protons and 18 neutrons
   2. BAn atom with 17 protons and 18 electrons
   3. CAn atom with 18 protons and 17 neutrons
   4. DAn atom with 17 protons and 19 neutrons
   ( )
6. 6

   A solid ionic compound does not conduct electricity, but it does when molten. Why?

   1. AThe ions are free to move when molten
   2. BElectrons are delocalised when molten
   3. CThe ions become smaller when molten
   4. DCovalent bonds break when molten
   ( )
7. 7

   Which molecule contains a double covalent bond?

   1. AHydrogen, H₂
   2. BWater, H₂O
   3. COxygen, O₂
   4. DMethane, CH₄
   ( )
8. 8

   Why does methane have a low boiling point?

   1. AThe covalent bonds inside the molecule are weak
   2. BThe forces between the molecules are weak
   3. CThe molecule is a gas at room temperature
   4. DThe molecule contains only single bonds
   ( )
9. 9

   Which statement about graphite is correct?

   1. AEach carbon atom is bonded to four others
   2. BIt is a poor conductor of electricity
   3. CIt is one of the hardest known substances
   4. DIt has a layered structure with delocalised electrons
   ( )
10. 10

    Which property of a metal is explained by its layers of positive ions being able to slide over one another?

    1. AIt can be bent and drawn into wires
    2. BIt is a good conductor of electricity
    3. CIt has a high melting point
    4. DIt has a high density
    ( )

Section B: Structured questions[20 marks]

Answer all questions in the spaces provided.

1. 11

   The table shows the numbers of protons, neutrons and electrons in three particles, P, Q and R.

   Data for three particles

   Particle	Protons	Neutrons	Electrons
   P	6	6	6
   Q	6	8	6
   R	11	12	10

   1. (a)

      Write the electronic configuration of particle P.

      [1]
   2. (b)

      Particles P and Q are isotopes. Explain what the table shows that proves this.

      [2]
   3. (c)

      State the charge on particle R.

      [1]
2. 12

   Sodium and chlorine react together to form sodium chloride.

   1. (a)

      Describe how a sodium atom and a chlorine atom each form an ion.

      [2]
   2. (b)

      Explain why sodium chloride has a very high melting point. (Supplement)

      [2]
   3. (c)

      State why solid sodium chloride does not conduct electricity. (Supplement)

      [1]
3. 13

   Hydrogen chloride is a simple molecular gas that dissolves in water to form an acidic solution.

   1. (a)

      Describe how a covalent bond forms between a hydrogen atom and a chlorine atom.

      [2]
   2. (b)

      Explain why hydrogen chloride has a low boiling point. (Supplement)

      [2]
   3. (c)

      State whether solid hydrogen chloride conducts electricity, and give a reason.

      [1]
4. 14

   Diamond, graphite and copper are three solids with very different properties.

   1. (a)

      Diamond and graphite are both giant covalent solids. Give one similarity and one difference between their structures.

      [2]
   2. (b)

      Explain why graphite can be used as an electrode.

      [2]
   3. (c)

      Copper can be beaten into shape without breaking. Explain this in terms of metallic bonding. (Supplement)

      [2]