Question

_Right true aur false f for the following statement_

1) a new substance is formed during a chemical change -
2) a physical change is a temporary change
3) sublimation is an Irreversible change
4) breaking of Glass is a man made Irreversible change
5) solvent is the component that dissolve in liquid​

Answer 1

Answer:

true,false,true,true,false

Answer 2

Answer:

1) True

2) True

3) False

4) True

5) False

Explanation:

1) Whenever any chemical change takes places, a new substance is always formed along with the liberation of energy in the form of heat or light.

Eg - $2 Mg + O_{2}$ = MgO + Δ (in form of dazzling white light)

2) A physical change is a change to the physical properties properties of a substance. The physical properties of a substance include such characteristics as shape (volume and size), color, texture, flexibility, density, and mass. They are usually reversible. Eg - Cooling of water vapors to form liquid water.

3) Sublimation is the transition of a substance directly from the solid to the gas state or vice-versa, without passing through the liquid state. They are always reversible. Eg - If we heat a piece of solid camphor then it directly vaporizes to form camphor vapors which can be again be cooled to get solid camphor.

4) If we break a glass then it breaks into many pieces which can't be joined again to get the original glass.

5) Solvent is the component of a solution which dissolves the solute in it.

Eg - Dissolving sugar into water to get sugar solution. Here, sugar is the solute and water is the solvent.