Question

3 examples of a chemical reaction where temperature gets changed.​

Answer 1

Answer:

1 - Cookies bake faster at higher temperatures.

2 - Bread dough rises more quickly in a warm place than in a cool one.

3 - Low body temperatures slow down metabolism

Answer 2

Answer:

1.Evolution of gas:

The chemical reaction between zinc and dilute sulphuric acid is characterized by the evolution of hydrogen gas.

Zn(s)+H

2

SO4(aq)→ZnSO

4

(aq)+H

2

(g)

2.Change in colour:

The reaction between the lead nitrate solution and potassium iodide solution.

Pb(NO

3

)

2

(aq)+2KI→PbI

2

(s)+2KNO

3

(aq)

In this reaction colour changes from colourless to yellow.

3.Formation of precipitate:

The action of Barium Chloride on sodium sulphate.

BaCl

2

(aq)+Na

2

SO

4

(aq)→BaSO

4

(s)+2KNaCl(aq)