Answer:

#1.Cutting of a cloth piece is a physical change because it does not change the chemical composition of cloth and the change is only in the state, size, shape, colour, texture or the smell of some or all of the substances that undergo a physical change.

#2.Yes, a new substance has been formed. The vinegar and milk react to form curds (a solid) and whey (a liquid). These curds cannot be returned to vinegar and milk. Once the curds are completely dried, they form a plastic that can be used.

#3.When a candle burns, both physical & chemical changes occur.

Physical Changes in Burning Candle: On heating, candle wax melts and form liquid wax. It is a physical change. Since it again turns into solid wax on cooling. This is a reversible change.

Chemical Changes in Burning Candle: When you light the candle, the wax present near the wick will melt. Wick absorbs the liquid wax. The liquid wax vaporizes due the heat produced by the flame. This wax vapor near to flame burns and gives new substances like Carbon Dioxide, Carbon soot, water vapours, heat and light. This is an irreversible change.

#4.Burning of wood is a chemical change because on burning wood changes to a totally different new products (ash, smoke and carbon dioxide).

Explanation:

hope its help

1. yes
2. no
3. yes
4. yes

Explanation:

l'm not sure