Science Form 3: Chapter 5: Thermochemistry

Thermochemistry is the study about ..................... during a chemical reaction.

• heat changes

• degree of hotness

• temperature changes

• pH changes

Heat can be .......................... or .............................. during chemical reactions.

• absorbed

• reduced

• released

• increased

What is involved to break down the bond between the chains?

• Heat released

• Heat absorption

Chemical reaction can be classified as .............................. and .............................. reaction.

• ectothermic

• exothermic

• intrathermic

• endothermic

Mark the exothermic reaction

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• 
• 
• 

Mark the correct statements when sodium hydroxide is dissolved in water using the following apparatus.

• The test tube will feel hot to the touch

• Heat is absorbed from the surroundings

• An endothermic reaction occurs

• Reading of the thermometer increases

The exothermic reaction involved ...................... of heat.

• the release

• the absorption

The absorption of heat during a chemical reaction is known as ....................................

• exothermic

• endothermic

• ectothermic

• intratermic

Which is an endothermic reaction?

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• 
• 
• 

which of the following is an endothermic process?

• solid to gas

• solid to liquid

• liquid to solid

• gas to liquid