F3 Chapter 5 Thermochemistry

Thermochemistry is

• the study of heat changes when physical reactions occur.

• the study of heat changes when chemical reactions occur.

• the study of energy changes when physical reactions occur.

Diagram shows reaction between sodium and water, producing heat. The reaction is known as (a)   reaction

A device that is suitable to determine exothermic or endothermic reaction is (a)  

Exothermic reaction is where heat is __________ to the surrounding

• taken in

• absord

• released

Cake baking is

• endothermic

• exothermic

Dissolving ammonium salt in water will cause a ___________ in surrounding temperature

• increase

• higher

• drop

• constant

Respiration, bomb explosion and neutralisation of acid with alkali are the examples of _______________ reactions

• exothermic

• endothermic

• precipitation

Based on the experiment, sodium hydroxide and ammonium chloride are the

• responding variable

• fixed variable

• manipulated variable

The diagram shows sublimation process that occurs in dry ice.

This process is endothermic. Why?

• New substance is formed

• There is a conversion of energy

• Dry ice absorbs heat from surroundings

• The water vapour formed is very cold.

Mark the exothermic reaction

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