WorksheetsQuiz 4.1D - Energy Change
Total questions: 12
Worksheet time: 8mins
The reaction between methane and chlorine to form chloromethane and hydrogen chloride is exothermic CH4(g)+Cl2(g)→CH3Cl(g)+HCl(g) ΔH=−102kJ Which statement is correct about this reaction?
Heat is absorbed during the reaction
The heat absorbed during bond breaking is the same as the heat release during bond formation
The heat absorbed during bond breaking is more than the heat release during bond formation
The heat absorbed during bond breaking is less than the heat release during bond formation
Ahmad had a slight headache while camping in hot weather. He took out substance X from his camping bag, mix it with substance Y and pour the mixture into a plastic bag. He then placed the plastic bag over his forehead. What are substances X and Y?
Ammonium nitrate, water
Anhydrous magnesium sulphate, water
Fused calcium chloride, water
Calcium oxide, calcium hydroxide
Which of the following is an exothermic reaction?
Liquid nitrogen → Nitrogen gas
Solid wax → Liquid wax
Zinc + hydrochloric acid → Zinc chloride + hydrogen gas
Ammonium chloride + water → Ammonium chloride solution
Which of the following operations absorbs heat energy from the surroundings?
Dissolving sodium hydroxide in water
Evaporating sodium chloride solution
Adding sodium chloride solution to silver nitrate solution
Adding ethanoic acid to ammonia solution
The energy profile diagram for the reaction, P → X + Y, is shown below.
-40 kJ
+30 kJ
+40 kJ
+ 70 kJ
A simple experiment as shown is carried out.
Which of the following will occur during the experiment?
The pH of the solution increases.
Heat energy is absorbed from the surroundings.
The temperature of the solution decreases.
The total energy content of the products is lower than the total energy content of the reactants.
The energy level diagram of a reaction is shown below.
Based on the diagram, it can be deduced that
it is an endothermic reaction.
the total energy of the products is 570 kJ.
the reactant has more energy than the products.
more bonds are formed than are broken.
The equation for the reaction between hydrogen and iodine is shown below.
H2(g)+I2(s)→2HI(g);ΔH=+11.3kJ
Which of the following shows that the reaction is endothermic?
The reaction releases 11.3 kJ of heat energy when 2 mol of hydrogen iodide are formed.
The total heat absorbed to break the bonds is more than the total energy released during the formation of hydrogen iodide.
The energy contained in hydrogen and iodine is higher than the energy contained in hydrogen iodide.
The reaction is a slow reaction.
Tick chemicals used in hot pack (You can choose more than 1 answer)
Ammonium chloride and water
Anhydrous calcium chloride and water
Anhydrous magnesium sulphate and water
Wet iron powder
When a hot pack is squeezed, a chemical reaction occurs. The reaction is an
exothermic reaction
endothermic reaction
When a hot pack is squeezed, a chemical reaction occurs. Energy content of the reactants is ___________ than products
higher
lower
When a hot pack is squeezed, a chemical reaction occurs. Energy absorbed in bond breaking is _________ than energy released in bond forming
less
more
