Adding salt to water makes it salty. Which of the following is true regarding this change?
It is a chemical change because a new substance is formed
It is a physical change because the original substances can be recovered
It is a chemical change because there is exchange of heat
It is a physical change because there is a slight change in colour

It is a chemical change because there is exchange of heat

It is a physical change because the original substances can be recovered

It is a physical change because there is a slight change in colour

It is a chemical change because a new substance is formed

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Solution

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Adding salt to water makes it salty. This is a physical change because the original substances can be recovered by evaporation. In a chemical change, substances cannot be recovered.

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Question 15

Fill in the blanks in the following statements using the words given in the box

(a) Making sugar solution is a …………………. change
(b) A physical change is generally ……………………..
(c) Grinding of wheat grain changes its size. It is a …………….. change.
(d) Iron benches kept in lawns and gardens get ……………… it is a …………….
(e) change because a new ……………… is formed

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The following are the observations of changes that have taken place. Align them to either chemical change or a physical change.

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Matter undergoes a change. The changes are of two types: Physical and chemical change.

A physical change is a change that involves only a change in the physical state of matter. Its chemical properties remain the same. Usually increasing the temperature or applying pressure or both bring about a physical change. On reversing the condition, that is reducing the temperature or reducing the pressure or both, the original state of matter is restored. In other words, physical changes are reversible.

A chemical change is a change that involves a change in the chemical composition of matter. A new substance is formed. In a chemical change, new chemical and physical properties of the substance are formed. In a chemical change, the chemical and physical properties of the substance formed will be different from the original substance.

In a chemical change, the properties that change are :

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Following are the observations of changes that have taken place. Classify them into chemical change or a physical change. [5 MARKS]

1. The change is temporary and can be reversed by changing the conditions in most of the cases.
2. New substance(s) is/are formed.
3. The chemical properties of the original substance remain the same.
4. There is an exchange of energy during this change which means that heat and light may be given out or absorbed.
5. As a result of the change, there may or may not be any change in the energy possessed by the original substance.
6. There is no change in the chemical composition of the original substance.
7. The change is permanent and cannot be reversed by changing the conditions or through ordinary physical processes.
8. There may or may not be any change in the state, size, shape, colour, and smell of the substance that undergoes this change.
9. The composition and the properties of the parent substance or substances change.
10. There is usually a change in the mass of the parent substance/s as well.

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Which of the following is not a feature of chemical change?

(I) Original substance can be obtained by simple physical methods.
(II) It is a temporary change.
(III) The new substances formed have properties different from those of the reacting substances.

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