What can be concluded about undesirable changes?

They cannot be useful.

They always occur suddenly.

Some may have beneficial effects in specific situations.

They only impact physical substances.

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Q1.

Which of the following is a physical change?

Q2.

What happens when air is blown into lime water?

Q3.

Which process shows that a substance can change its appearance?

Q4.

When ice melts, what type of change occurs?