Matter questions | form one Chemistry

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.

Answer / Solution

2. Energy is either absorbed or given out.

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.

Answer / Solution

2. Substances change directly to vapour without the liquid state when heated.

Hygroscopic and deliquescent substances can be used as

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

Answer / Solution

UNSOLVED

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

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

Answer / Solution

2. simple distillation

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.

Answer / Solution

500. to bleach dye/colour.