Chemical Energetics
Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.
Exothermic and endothermic reactions
SubtopicExothermic and endothermic reactions under Chemical Energetics for Grade 11 IGCSE.
Preview questions (no answers)
- 1.
When iron reacts with oxygen to form rust, heat is slowly released. This is an example of:
A.An endothermic reaction
B.An exothermic reaction
C.A thermal decomposition
D.An evaporation process
- 2.
Which statement is true regarding the energy of bonds?
A.Energy is always needed to break a bond
B.Energy is always needed to form a bond
C.Bond breaking releases energy
D.Bond forming is endothermic
- 3.
Which of the following processes is exothermic?
A.Evaporating alcohol
B.Boiling an egg
C.Condensing steam to water
D.Sublimation of dry ice
Download the worksheet for Chemical Energetics - Exothermic and endothermic reactions to practice offline. It includes additional chapter-level practice questions.
Energy level diagrams
SubtopicEnergy level diagrams under Chemical Energetics for Grade 11 IGCSE.
Preview questions (no answers)
- 1.
What is the starting point for measuring the activation energy on a reaction pathway diagram?
A.The product energy level
B.The reactant energy level
C.The bottom of the graph
D.The peak of the graph
- 2.
Bond making is an ________ process, which ________ energy.
A.Endothermic, releases
B.Exothermic, releases
C.Endothermic, absorbs
D.Exothermic, absorbs
- 3.
In a reaction profile, the difference between the energy level of the reactants and the products is called:
A.Activation energy
B.Internal energy
C.Enthalpy change
D.Specific heat capacity
Download the worksheet for Chemical Energetics - Energy level diagrams to practice offline. It includes additional chapter-level practice questions.
Bond breaking and bond forming calculation
SubtopicBond breaking and bond forming calculation under Chemical Energetics for Grade 11 IGCSE.
Preview questions (no answers)
- 1.
Which of these bonds requires the least energy to break based on their bond energies? , , , .
A.B.C.D. - 2.
How many bonds are broken in the reaction of mole of ethane ()?
A.2
B.4
C.6
D.8
- 3.
A reaction has a total bond breaking energy of and a total bond forming energy of . The reaction is:
A.Exothermic
B.Endothermic
C.At equilibrium
D.Isothermal
Download the worksheet for Chemical Energetics - Bond breaking and bond forming calculation to practice offline. It includes additional chapter-level practice questions.