Three substances given below are kept in the open for a few days and some changes were observed.

Which of the substances will show a chemical change?

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P and Q

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Solution

The correct option is A P
$∙$ During a chemical change one substance reacts with another to undergo a change in chemical composition. Chemical change brings change in the chemical properties of matter and we get new substances.

$∙$ Here, the eggs rot and release a foul odour. The moth balls become smaller in size due to sublimation but the chemical composition remains same.The plastic bottle doesn't show any change. Hence, only eggs will show chemical change.

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Similar questions

Q. Three substances given below are kept in the open for a few days and some changes were observed.

Which of the substances will show a chemical change?

Q. Which of the following substances will undergo a chemical change if kept in the open for a week?

Q. (1)

If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.
(a) Do you think rust is different from iron?

(2)

If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.

(b) Can you change rust back into iron by some simple method?

(3)

If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.

(4)

If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.

(d) Give two other examples of a similar type of change.

Q. Statement I: If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.

Statement II: Rusting of iron is a chemical change.

Q. Why do silver articles turn black when kept open for a few days?
(a) Name the phenomenon involved.
(b) Name the black substance formed and give its chemical formula.

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