Question

changes occur due to human activity is called________ changes.
ripening of fruit is a ________ change.
the constant temperature at which solid change to liquid is known as________.
when the vapours of a subliming substances cool, they from a____________.
a chemical change always involved the chance of______.​

Answer 1

Hi mate

Here is your answer

1. Changes occur due to human activity is called human induced changes.

2.Ripening of fruits is a chemical changes.

Reason;

During ripening the pigment present in the skin of the fruit changes and this can not be reversed back. it is a chemical change as once a fruit ripens it cannot turn raw again.

3.Solidification or melting point

Reason:

• Solidification:

When a liquid changes into a solid it is called solidification.

(or)

• Melting point

The solid begins to go from a solid state to a liquid state a process called melting.

4.Vapour or gas

Reason:

The changing of a solid directly into vapours on heating and of vapours into solid on cooling, is known as sublimation. When these solid substances are heated, their particles move quickly and they separate completely to form vapor (or gas).

5.Chemical synthesis or, alternatively.

Reason:

Chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively.

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Answer.

I hope this would help you mate