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Worksheetsthemochemistry
Total questions: 17
Worksheet time: 17mins
Which reaction explains about exothermic reaction?
Heat is absorbed from the surroundings
Surrounding temperature increases
Heat energy is changed to chemical energy
Thermometer reading decreases
Which statement is correct about endothermic reaction?
Heat is released
Thermometer reading increases
Surrounding temperature increases
Breaks the chemical bonds of the reactant
Respiration is an exothermic reaction.
Which of the following explains about the process?
Release heat to the environment
The chemical bond in glucose is broken down
Heat energy is changed to chemical energy
Forming water as byproduct
Which process does not involve the release of heat energy?
The combustion of petrol
The formation of ice
Volcano eruption
Melting of butter
The diagram shows the bread dough is put into an oven to be baked.
Which statements are correct about the baking process?
Choose more than one answer.
Endothermic reaction occurs
The heat from the oven is absorbed by the dough
Thermal equilibrium achieved when the bread is cooked
The formation of new substance did not occur
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.
Endothermic is a reaction that absorbs heat.
TRUE
FALSE
Breaking the chemical bond releases energy.
TRUE
FALSE
What happens when heat energy is absorbed?
Bond formation occurs
Exothermic reaction
Bond breakage occurs
No change occurred
The diagram shows the set - up of apparatus for an experiment.
Which of the following statements is true about the reaction that occurred in the experiment?
Temperature of water increases
Heat energy is absorbed from the environment
Exothermic reaction occurs
Heat energy is released during reaction
How can we identify that the absorption of heat has occurred?
The surrounding temperature increases
The surrounding temperature decreases
The container will heat up
No change occurs
The diagram shows a chemical reaction.
The initial temperature of distilled water is 27⁰C.
What temperature may be recorded by the thermometer in the sodium hydroxide solution?
35⁰C
20⁰C
18⁰C
10⁰C
Which of the following is an endothermic reaction?
Photosynthesis
Respiration
Burning of dried leaves
Neutralisation
What is the use of hot pack?
Treating swelling
Cure fever
Relieve joint pain
Relieve inflammation
The temperature of the substance in a reaction remains constant after reaching the thermal equilibrium.
TRUE
FALSE
Choose the tools that apply the concept of thermochemistry reactions.
During an exothermic reaction, heat content in the surroundings increases because
heat energy is destroyed during reactions
the reaction absorbs heat energy
the energy contained in the reactants is lower then the products
the energy contained in the products is lower than the reactants
