Question

QUESTION 1 Consider the following diagram that shows liquid water evaporating to form water vapour. Evaporation 1.1. Use chemical formulae to represent the process in the diagram above and indicate the phases of the substance undergoing this process (2) 1.2. Give three separation methods that can be used to reverse a physical change. (3)​

Answer 1

The process of evaporation by which liquid water changes to vapor is shown by a chemical formulae as follows:

• H₂O (l) → H₂O (g)

Three separation methods that can be used to reverse a physical change include:

1. Evaporation
2. Crystallization
3. Filtration

What is evaporation?

Evaporation is the process by which liquids changes to vapor or gas spontaneously.

The rate of evaporation of a liquid increases with increase in temperature of the liquid. The rate of evaporation also increases with increase in surface area of the liquid exposed as well as with increase in wind speed.

The process by which liquid water changes to vapor can be represented by chemical formulae as follows:

H₂O (l) → H₂O (g)

In the equation above, the liquid phase of water, l, is undergoing change to gaseous phase, g.

b. Separation techniques are techniques which are used to separate mixtures of substances.

Three separation methods that can be used to reverse a physical change include:

1. Evaporation - used to separate a mixture of salt and water
2. Crystallization - used to separate a crystal solute from solution
3. Filtration - used to separate a solute from its suspension

In conclusion, physical changes are those changes that are easily reversible and which no new products are formed.

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