Which box gives the best description of the molecule shown?

1
CHEMISTRY DEPARTMENT WAID ACADEMY
Standard Grade Topic 4
2
Which of the following gives the best description
of the molecule shown?

1. A molecule of oxygen with a double covalent bond
   is shown.
2. A molecule of hydrogen with a single covalent
   bond is shown.
3. A molecule of nitrogen with a triple covalent
   bond is shown.
4. A molecule of fluorine with a single covalent
   bond is shown.

3
Which of the elements shown below will conduct
electricity when solid?

1. Sulphur.
2. Silicon.
3. Argon.
4. Carbon.

4
Which the substances shown below has a covalent
lattice structure?

1. Sulphur dioxide.
2. Silicon.
3. Sulphur.
4. Magnesium chloride.

5
Which of the following correctly describes a
molecule made up of two atoms?

1. Double covalent.
2. Diatomic.
3. Di-molecular.
4. Monatomic.

6
Which of the following shows three elements which
all exist as diatomic molecules?

1. Hydrogen, fluorine and bromine.
2. Oxygen, sulphur and chlorine.
3. Nitrogen, phosphorus and sulphur.
4. Helium, neon and argon.

7
Which of the substances shown has ions in an
ionic lattice?

1. Phosphorus.
2. Carbon (diamond).
3. Lead.
4. Magnesium chloride.

8
What is the valency of phosphorus?

1. 2.
2. 3.
3. 4.
4. 5.

9
Which box shows the formula for calcium carbide?

1. CaC2.
2. CaC.
3. Ca2C4.
4. Ca2C.

10
Which formula shown is the correct formula for
dinitrogen monoxide?

1. NO2.
2. N2O2.
3. N2O.
4. NO

11
Which of the substances shown below will conduct
electricity?

1. Solid copper sulphate crystals.
2. Molten sulphur.
3. Solid candle wax.
4. Molten lead iodide.

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End of test