Understanding Endothermic and Exothermic Processes

What is the main characteristic of an exothermic reaction?

• It only occurs in phase changes.

• It neither absorbs nor releases energy.

• It releases energy to the surroundings.

• It absorbs energy from the surroundings.

In the context of heat transfer, what is a 'system'?

• The focal point of a study, like a beaker or building.

• The surroundings of a reaction.

• Only the chemical substances involved.

• The entire universe.

How can you remember the difference between exothermic and endothermic reactions?

• EXO means no heat transfer, ENDO means heat transfer.

• EXO and ENDO both mean heat entering.

• EXO means heat exiting, ENDO means heat entering.

• EXO means heat entering, ENDO means heat exiting.

Which of the following processes is exothermic?

• Baking pizza bread.

• Photosynthesis.

• Condensation.

• Melting ice cubes.

What type of process is photosynthesis in terms of energy transfer?

• Both, depending on the plant species.

• Exothermic, because it releases heat.

• Endothermic, because it absorbs sunlight.

• Neither, because it does not involve heat.