EXOTHERMIC AND ENDOTHERMIC REACTION

Which of the following reaction (s) is (are) exothermic?

• Evaporation of water.

• Freezing of water.

• Melting of salt

• Sublimation of dry ice, CO2 (s)

Which of the following is an exothermic reaction?

• Photosynthesis

• Displacement reaction

• Dissolving ammonium chloride

• Crytallization of sodium thiosulphate

Temperature usually _____ in EXOthermic reactions.

• increases

• decreases

• stays the same

Temperature usually ____________in endothermic reactions.

• increases

• decreases

• stay the same.

A change in matter in which heat is absorbed is .....reaction

• exothermic

• endothermic

A chemical reaction in which more energy is absorbed than is released is endothermic

• True

• False

Which of these is an endothermic reaction?

• Respiration

• Combustion

• Neutralisation

• Dissolving ammonium salt

Photosyntheis is an_________________ reaction.

• exothermic

• endothermic

In a laboratory activity, compound P is crytallize in water in a test tube. It is noted that the wall of the test tube becomes cold. Which of the following is most probably compound P?

• Ammonia

• Hydrochloric acid

• Ammonia

• Sodium thiosulphate

In an exothermic reaction, heat is ... to (from ) the surrounding.

• absorbed

• released