St Peter the Apostle High School
Chemistry Department
Bonding
N4 & N5 Homework Questions
Answer questions as directed by
your teacher.
National 4 level questions are
first followed by National 5 level
questions.
National 4 Questions
1.
A
B
C
D
E
F
(a) Identify the box containing an element made up of molecules.
(b) Identify the box containing a mixture of compounds.
(c) Identify the box containing a compound which is made up of diatomic molecules.
(3)
2.
The grid shows the names of some compounds.
(a) Identify the two compounds which do not contain oxygen.
(b) Identify the covalent compound.
3.
(1)
(1)
Natural gas is made up mainly of methane molecules.
What holds the atoms together in a methane molecule?
(1)
4.
The grid shows the formulae of some substances.
(a) Identify the substance which is ionic.
(b) Identify the two substances which exist as diatomic molecules.
5.
(1)
(1)
6.
(2)
National 5 Questions
1.
In a hydrogen fluoride molecule, the atoms share electrons in order to achieve the
same electron arrangements as the atoms in which group?
A 0
2.
B 1
C 2
D 7
Carbon dioxide is covalent and made up of discrete molecules but silicon dioxide has a
covalent network structure. Explain what is meant by
(a) discrete covalent molecules
(b) a covalent network structure.
(1)
(2)
3.
4.
Draw diagrams to show how the outer electrons form covalent bonds in each of
the following molecules.
(a) hydrogen sulphide
(b) carbon fluoride
(c) chloromethane (CH3Cl)
(3)
Nitrogen trifluoride, NF3, is used in the manufacture of plasma screens.
(a) Draw a diagram showing all outer electrons to represent a molecule of
nitrogen trifluoride.
(b) The atoms in nitrogen trifluoride are held together by covalent bonds.
Copy and complete the following sentence by choosing the correct words.
(1)
(1)
5.
The shapes and names of some molecules are shown below.
Phosphine is a compound of phosphorous and hydrogen. The shape of a molecule
of phosphine is likely to be
A
6.
tetrahedral
B pyramidal
C bent
D linear
Give the names of the shapes of the following molecules:
(a) hydrogen sulphide
(b) silicon chloride
(c) carbon dioxide
(d) hydrogen chloride
(1)
(4)
7.
Information on some two-element molecules is shown in the table.
(a) Complete the table to show the shapes of the molecules.
(b) The hydrogen fluoride molecule can be represented as:
(3)
Showing all outer electrons, draw a similar diagram
to represent a molecule of water, H2O.
(1)
8.
The grid shows the symbols of some elements.
Identify the two elements which would react together to form a molecule with the same
shape as an ammonia (NH3) molecule.
(1)
9.
The grid shows the symbols of some elements.
Identify the two elements which would react together to form a molecule with the
same shape as a methane (CH4) molecule.
(1)
10. The first step in extracting titanium from its ore is to convert it into titanium (IV) chloride.
Titanium (IV) chloride is a liquid at room temperature and does not conduct electricity.
(a) What type of bonding, does this suggest, is present in titanium (IV) chloride?
(1)
Titanium (IV) chloride is then reduced to titanium metal. The equation for the reaction
taking place is:
(b) Copy out the equation and balance it.
(1)
11. The element carbon can exist in the form of diamond. The structure of diamond is
shown
(a) Name the type of bonding and structure present in diamond.
(b) Carbon forms many compounds with other elements such as
hydrogen. Draw a diagram to show how the outer electrons
are arranged in a molecule of methane CH4.
(c) Draw a diagram to show the shape of a molecule of methane.
(4)
12. (a) Explain clearly what happens when
(i) an atom of chlorine forms a chloride ion
(ii) an atom of calcium forms a calcium ion
(b) What happens during the formation of an ionic bond in calcium chloride?
(3)
13. The diagram shows an arrangement of ions in an
ionic compound.
(a) What term is given to the arrangement of ions
in an ionic solid?
(b) Explain why solid ionic compounds do not
conduct electricity.
(c) Many ionic compounds are coloured.
Using the information in the table, state the colour of the chloride ion.
(3)
14. A technician set up some experiments to investigate electrical conductivity.
Identify the two experiments in which the bulb would light.
(2)
15. A teacher set up some experiments to investigate electrical conductivity.
Identify the two experiments in which the bulb will light.
(1)
16. The table gives information about some substances.
(a) Identify the metal.
(b) Identify the two covalent substances.
(1)
(1)
17. The table gives information about some substances.
(a) Identify the substance which is a gas at 0oC.
(b) Identify the two substances which exist as molecules.
(1)
(1)
18. Several conductivity experiments were carried out using the apparatus below.
Identify the two experiments in which the bulb would light.
(2)
19. Which line in the table shows the properties of a covalent network substance?
(1)
20. Which of the following chlorides conducts electricity when molten?
A calcium chloride
C phosphorous chloride
B nitrogen chloride
D silicon chloride
(1)
21. Explain each of the following:
(a) Sodium oxide is a solid at room temperature.
(b) Carbon dioxide is a gas at room temperature.
(c) Silicon dioxide is a solid at room temperature.
(3)
22. Salt solution conducts electricity but glucose solution does not.
(a) Draw and label a diagram, of the apparatus which you would use to show that
salt solution conducts electricity.
(b) Why does glucose solution not conduct electricity?
(1)
(1)
23. Using your knowledge of chemistry explain why, although neither lithium chloride (LiCl)
nor tetrachloromethane (CCl4) conduct electricity in the solid state, only lithium chloride
conducts in the liquid state.
(3)
24. A student set up the following experiment to break up copper chloride solution into its
elements.
(a) Name this process.
(b) Copy and complete the following sentence by choosing the correct word:
In the experiment the positive metal ions are attracted to the positive/negative
electrode.
(c) A brown solid is produced at one of the electrodes. What would be seen
happening at the other electrode?
(d) Name a non-metal element which is suitable for use as the electrodes.
(1)
(1)
(1)
(1)
25. A pupil carried out experiments to investigate what happens when electricity is passed
through melts.
(a) Explain why electricity can pass through molten ionic compounds.
(1)
(b) Name the products at the positive and negative electrode when electricity is passed
through the following melts
(i) magnesium chloride
(ii) sodium iodide
(iii) lead bromide
(iv) calcium oxide
(4)