Matter questions | form one Chemistry

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# Question
1

When you melt a piece of iron, it undergoes:
A. sublimation
B. physical change
C. chemical change
D. combination


Short answers
2

What is Unsaturated solution?


Short answers
3

What is Thermal decomposition?


Short answers
4

Suggest one method of separating each of the following:
(i) Green solution from leaves.
(ii) Alcohol from water.


Short answers
5

Write the names of the following processes of changing matter from one state to another.
(i) Gas to liquid.
(ii) Gas to solid.
(iii) Solid to gas.


Short answers
6

In any chemical change:

  1. Energy is not created.
  2. Energy is either absorbed or given out.
  3. Energy is created.
  4. Energy is neither liberated nor absorbed.

Multiple choices
7

Sublimation is the process whereby

  1. Substances float in liquids when heated.
  2. Substances change directly to vapour without the liquid state when heated.
  3. A mixture of solid substances is separated by heating.
  4. An alcohol is separated from water.

Multiple choices
8

Hygroscopic and deliquescent substances can be used as

  1. oxidising agents
  2. drying agents
  3. weak electrolytes
  4. catalyst
  5. reducing agents

Multiple choices
9

Water can be obtained from a solution of common salt by:

  1. evaporation
  2. simple distillation
  3. condensation
  4. fractional distillation.
  5. filtration

Multiple choices
10

The following are the uses of chromatography ​ except

  1. to analyse blood in crime scenes.
  2. to detect different fibres.
  3. to detect water pollution.
  4. to bleach dye/colour.
  5. to test the purity of organic substances.

Multiple choices