Question

Which of the following energy conversions can take place during a chemical reaction?

• A. Chemical energy $\to$ Sound energy
• B. Chemical energy $\to$ Heat energy
• C. Chemical energy $\to$ Electrical energy
• D. Chemical energy $\to$ Light energy

Answer 1

Answer: (A), (B), (C), (D)

The correct options are
A

Chemical energy $\to$ Sound energy

B

Chemical energy $\to$ Heat energy

C

Chemical energy $\to$ Electrical energy

D

Chemical energy $\to$ Light energy

During a chemical reaction, the chemical energy stored within the bonds of reactants can be converted to different forms of energy like heat, light and sound when reactants react to form products.

Example:- (i) Burning of fossil fuels is a chemical reaction which generates a large amount of heat and light.

$C{H}_4\left(g\right)+2O_2\left(g\right)\to C{O}_2\left(g\right)+2H_{2}O\left(g\right)$

(ii) When lead nitrate ($Pb(N{O}_3{)}_2$) is heated it decomposes to form lead oxide ($PbO$), nitrogen dioxide ($N{O}_2$) and oxygen ($O_2$) along with a crackling sound.

$2Pb\left(N{O}_3{)}_2\right(s)+\stackrel{Heat}{\to }2PbO(s)+4N{O}_2(g)+O_2(g)$

(iii) Chemical energy is converted to electrical energy in batteries.