The reactions which produce light and heat are known as _______________.
Statement 1: Nitrogen and hydrogen combine together to form ammonia.
Statement 2: It is an exothermic reaction.
Statement 1 is false and Statement 2 is true
Both Statement1 and Statement2 are true.
The Statement1 is true but the Statement 2 is false.
Both Statement 2 and Statement 1 are false.
Burning of coal ______energy.
releases and then absorbs
When water is added to quick lime,
a little amount of heat energy is evolved.
a large amount of heat energy is evolved.
a large amount of heat energy is absorbed.
a little amount of heat energy is absorbed.
What happens when quick lime is added to water?
Heat is evolved
Heat is absorbed
No change in heat
Respiration is an exothermic process (release of energy).
Which among the following is an exothermic reaction (releases energy)?
Melting solid salts
All of the given options
Reaction during respiration
When dilute hydrochloric acid reacts with sodium hydroxide,
some heat is absorbed
some heat is released
no heat is released
During a chemical reaction, if the reactants have more chemical energy than the products formed,
energy is absorbed
energy is released
no changes in energy