Worksheets11.1 Heat Change In Reaction
Total questions: 20
Worksheet time: 11mins
Which of the following statements is true about what happens in all chemical reactions?
The final substances are called reactants.
Bonds between atoms are broken and new bonds are formed.
When a scientist mixed two chemicals, an exothermic reaction takes place. Which of the following would be proof that the reaction was exothermic?
a temperature increase
a temperature decrease
What is meant by an endothermic reaction?
A really cold reaction
A reaction that absorbs heat energy
A reaction that releases heat energy
Which of the following is an endothermic reactions?
Combustion
Neutralisation
Dissolving ammonium nitrate
Respiration
Which of these are exothermic reactions? Choose two answers.
Displacement reactions
Dissolving sodium thiosulphate
Respiration
Photosynthesis
Which of the following is true about the reaction shown in this diagram:
It's exothermic and has a positive ΔH value
It's exothermic and has a negative ΔH value
It's endothermic and has a positive ΔH value
It's endothermic and has a negative ΔH value
In an exothermic reaction, heat is ...
taken in
given out
Compound P is dissolved in water in a test tube. It is noted that the wall of the test tube becomes cold. Which of the following is most probably compound P?
Sulphuric acid
Ammonia
Hydrochloride Acid
Ammonium chloride
Which of the following is correct about melting process?
The total energy content of the product is higher than the energy content of the reactants.
The temperature of the surroundings rises.
The total energy content of the reactants is higher than the energy content of the products.
Endothermic or exothermic reaction?
Endothermic
Exothermic
Which one of the following reaction is exothermic?
Sublimation of dry ice, CO2 (s)
Freezing of water
Evaporation of water
Melting of salt
Which statement is TRUE?
Heat energy is released when bond is broken.
Heat energy is released during formation of bond.
Choose the TRUE statement.
In exothermic reaction, the total energy content of products is lower than that of reactants.
In exothermic reaction, the total energy content of products is lower than that of reactants.
Which statement is TRUE?
Endothermic has a positive ΔH value.
Endothermic has a negative ΔH value.
Heat energy is _________ when bonds form.
released
absorbed
destroyed
created
Heat energy is absorbed to break bonds in chemical reactions.
True
False
Weak bonds is broken, strong bonds is formed in exothermic.
True
False
Temperature usually _____ in EXOthermic reactions.
Stays the same
Increases
Decreases
Photosynthesis is an _____ reaction.
EXOthermic
ENDOthermic
Strong bonds is broken, weak bonds is formed in exothermic reaction.
True
False
