Which statement about metals is true?

1
CHEMISTRY DEPARTMENT WAID ACADEMY
Standard Grade Topic 11
2
Which statement about metals is true?

• Metals conduct electricity only when solid.
• Metals conduct electricity both as solids and as
  liquids.
• Metals do not conduct when solid but do conduct
  when molten.
• Metals do not conduct electricity either when
  solid or when liquid.

3
What are the main properties of aluminium being
used when it is used to make aircraft bodies?

• High density and high strength.
• Good thermal and electrical conductivity.
• High strength and good thermal conductivity.
• High strength and low density.

4
Which of the following is a very reactive metal
that is stored under oil?

• Lithium.
• Calcium.
• Zinc.
• Copper.

5
Which of the following shows the correct order of
reactivity of the four metals starting with the
most reactive?

• copper, iron, zinc, calcium
• calcium, iron, zinc, copper.
• copper, zinc, iron, calcium.
• calcium, zinc, iron, copper

6
Which metal shown below will not react with
dilute hydrochloric acid?

• Copper
• Zinc
• Iron
• Magnesium

7
Which metal shown below can be extracted from its
ore by heat alone?

• Mercury
• Zinc
• Copper
• Aluminium

8
Metal X has the following properties-It does
not react quickly with water it can be obtained
from its ore by heating with carbon and it
displaces tin ions from solution. Which metal
could be X?

• Calcium
• Zinc
• Copper
• Silver

9
What type of reaction occurs when a metal is
extracted from its ore?

• Displacement
• Reduction
• Oxidation
• Precipitation

10
What are the two main reasons why the alloy,
solder, is used to join metals together in
electrical circuit boards?

• It is corrosion resistant and very hard.
• It has a low melting point and is corrosion
  resistant.
• It is very hard and a good conductor.
• It is a good conductor and has a low melting
  point.

11
Analysis of a hydrocarbon compound showed that it
was composed of 75 carbon and 25 hydrogen by
mass.What is the empirical formula of the
compound?

• CH
• CH3
• CH4
• CH2