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Worksheetsthermochemistry
Total questions: 50
Worksheet time: 40mins
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 chemical reactions occur.
Diagram shows reaction between sodium and water. The reaction is
(a)
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 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
Endothermic reaction that occurs in plants is (a)
Exothermic reaction that occurs in animals is (a)
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
During an endothermic reaction in a beaker if we are part of the surroundings and touched the beaker, it would feel _______.
Warm
Cold
Bubbly
Damp
The diagram shows the reaction of
Rajah menunjukkan tindak balas
Endothermic/ Endotermik
Exothermic/ Eksotermik
The following are examples of Exothermic reactions except
Berikut merupakan contoh tindak balas eksotermik kecuali
Combustion/ Pembakaran
Oxidation of metal/ Pengoksidaan logam
Photosynthesis/ Fotosintesis
Respiration/ Respirasi
The following are examples of endothermic reaction except
Berikut merupakan contoh tindak balas endotermik kecuali
Photosynthesis/ fotosintesis
Respiration/ respirasi
reaction between acid and sodium carbonate/ tindak balas acid dengan natrium karbonat
frying eggs/ menggoreng telur
The following are examples of endothermic reaction except
Berikut merupakan contoh tindak balas endotermik kecuali
Photosynthesis/ fotosintesis
Respiration/ respirasi
reaction between acid and sodium carbonate/ tindak balas acid dengan natrium karbonat
frying eggs/ menggoreng telur
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
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.
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
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.
Which one of the following is an endothermic process?
Photosynthesis
Rusting
Combustion
Burning a candle
Which one of the following is an exothermic process?
Ice melting
Condensation of water vapor
Water evaporating
Cooking an egg
Endothermic or exothermic?
Endothermic because heat is absorbed
Exothermic because heat is released
Not enough information
Endothermic or exothermic?
Endothermic because heat is absorbed
Exothermic because heat is released
Not enough information
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 chemical reactions occur.
When heat flows from system to the surroundings that is an example of an ________________ process.
exothermic
endothermic
Sweating is an __________________ process because heat is released.
endothermic
exothermic
Ice cream melting is an example of an __________ process.
endothermic
exothermic
