Exam-style Questions: Atomic Structure

 

  1. Use the words below to name the four changes of state:

    melting; evaporation, freezing; condensing.

    (i) liquid to solid

    (ii) liquid to gas

    (iii) gas to liquid

    (iv) solid to liquid

    (Marks available: 2)

    Answer

     

    Answer outline and marking scheme for question: 1

    (i) freezing

    (ii) evaporating

    (iii) condensing

    (iv) melting

    (4 correct = 2 marks)

    (2 correct = 1 mark)

    (Total = 2 marks)

  2. Working on a piece of paper, complete the diagram below by drawing the arrangement of particles found in a liquid. One has already been placed in the box for you.

    Exam-style Questions

    (Marks available: 1)

    Answer

     

    Answer outline and marking scheme for question: 2

    Exam-style Questions

    (Total = 1 mark)

  3. The following experiment was set up:

    Exam-style Questions

    Hydrogen chloride gas is released from the concentrated hydrochloric acid.

    Ammonia gas is released from the concentrated ammonium hydroxide.

    After 10 minutes, white 'smoke' (ammonium chloride) was seen at X in the diagram.

    a) What scientific idea does this experiment demonstrate?

    (1 mark)

    b) Which of the two particles, ammonia of hydrogen chloride is the heaviest?

    Explain your answer.

    (2 marks)

    c) What would you see if the experiment was repeated at a higher temperature?

    (2 marks)

    (Marks available: 5)

    Answer

     

    Answer outline and marking scheme for question: 3

    a) Diffusion

    (1 mark)

    b) Hydrogen chloride is the heavier particle,

    (1 mark)

    because it has not moved as far down the tube as the ammonia has.

    (1 mark)

    c) The ammonium chloride would be formed in the same place,

    (1 mark)

    but it would happen faster at a higher temperature.

    (1 mark)

    (Total = 5 marks)

  4. Atoms are made up of three types of particle - protons, neutrons and electrons.

    Complete the table showing the number of particles in the following atoms:

    Element: Atomic No: Mass No: Protons: Neutrons: Electrons:
    K 19 39      
    Ar 18 40      

    (Marks available: 3)

    Answer

     

    Answer outline and marking scheme for question: 4

    Element: Protons: Neutrons: Electrons:
    K 19 39 -19 = 20 19
    Ar 18 40 - 18 = 22 18
      (1 mark) (1 mark) (1 mark)

    (Answers for both atoms must be correct to gain the mark underneath)

    (Total = 3 marks)

  5. a) Draw the electron arrangement of aluminium, Al.

    (2 marks)

    b) Give the symbol of the ion that aluminium is most likely to form.

    (1 mark)

    (Marks available: 3)

    Answer

     

    Answer outline and marking scheme for question: 5

    a) Atomic number of Al = 13 so there are 13 electrons present.

    Exam-style Questions

    (1 mark)

    b) Al3+

    (1 mark)

    (Total = 3 marks)