Hydrogen

Chemical energy is converted to _____ energy by a fuel cell.

Which of the following converts energy from the combustion of fuel directly to the electrical energy?

Define fuel cell.

Give the chemical equation (balanced) for the formation of water.

Who prepared hydrogen gas in his experiments:

How many types of chemical reactions are there? Explain.

Write one example of combination and decomposition reaction. 

Classify the following reaction according to its nature: 

$2{\mathrm{H}}_2+{\mathrm{O}}_2\to 2{\mathrm{H}}_2\mathrm{O}$

(Decomposition reaction / Combination reaction / Double displacement reaction)

Combination reactions are generally endothermic reactions.

What do you understand by the term calorific value?

Explain displacement reaction with the help of an example.

Explain displacement reaction, with the help of an example.

When hydrogen and oxygen react to form water, it is an example of _____ reaction.