THERMOCHEMISTRY KSSM F3

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

Endothermic reaction is when the heat is _________________ from the surrounding

• taken in

• released

• taken out

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

When sodium hydroxide is added to hydrochloric acid, the temperature reading on the thermometer is ______________ and the reaction name is __________________

• decreasing

• increasing

• constant

• neutralisation

• titration

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

• responding variable

• fixed variable

• manipulated variable