HARD
MYP:4-5
IMPORTANT
Earn 100

Calculate, using the information in the table, the enthalpy of combustion of octane C8H18, a major component of petrol.

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Important Questions on How Can Our Energy Resources Be Accessed Fairly?

HARD
MYP:4-5
IMPORTANT
MYP By Concept 4&5 Chemistry>Chapter 10 - How Can Our Energy Resources Be Accessed Fairly?>ACTIVITY: Calculating enthalpy changes (ΔH) using bond energy tables>Q 4
Calculate the energy released when 0.50 mole of methane is burnt.
MEDIUM
MYP:4-5
IMPORTANT
MYP By Concept 4&5 Chemistry>Chapter 10 - How Can Our Energy Resources Be Accessed Fairly?>ACTIVITY: Calculating enthalpy changes (ΔH) using bond energy tables>Q 4
When 10 g of methane is burnt in oxygen, the heat evolved is 560 kJ. What is the heat of combustion (in kJ mol-1) of methane?
HARD
MYP:4-5
IMPORTANT
MYP By Concept 4&5 Chemistry>Chapter 10 - How Can Our Energy Resources Be Accessed Fairly?>ACTIVITY: Calculating enthalpy changes (ΔH) using bond energy tables>Q 4
Calculate the energy released (heat produced) when 32.10 g of methane is burnt.
HARD
MYP:4-5
IMPORTANT
MYP By Concept 4&5 Chemistry>Chapter 10 - How Can Our Energy Resources Be Accessed Fairly?>ACTIVITY: Calculating enthalpy changes (ΔH) using bond energy tables>Q 5
If a chemical reaction ∆H is positive: state the type of chemical reaction involved.
HARD
MYP:4-5
IMPORTANT
MYP By Concept 4&5 Chemistry>Chapter 10 - How Can Our Energy Resources Be Accessed Fairly?>ACTIVITY: Reflecting on enthalpy of fusion and vaporization>Q 1
Describe the energy changes and the changes to the particle's movement and intermolecular forces when melting and boiling are reversed.
HARD
MYP:4-5
IMPORTANT
MYP By Concept 4&5 Chemistry>Chapter 10 - How Can Our Energy Resources Be Accessed Fairly?>ACTIVITY: Reflecting on enthalpy of fusion and vaporization>Q 2
Identify the contribution of the ∆S components in Gibbs free energy ∆G when water boils and when it freezes.
MEDIUM
MYP:4-5
IMPORTANT
MYP By Concept 4&5 Chemistry>Chapter 10 - How Can Our Energy Resources Be Accessed Fairly?>ACTIVITY: Reflecting on enthalpy of fusion and vaporization>Q 3
Explain why a burn from steam (at 100°C) is more severe (painful) than a burn from boiling water (at 100°C).
HARD
MYP:4-5
IMPORTANT
MYP By Concept 4&5 Chemistry>Chapter 10 - How Can Our Energy Resources Be Accessed Fairly?>ACTIVITY: Reflecting on enthalpy of fusion and vaporization>Q 4
Car cooler cans contain a mixture of ethanol (10 per cent) and water (90 per cent). When the mixture is sprayed inside an overheated car the temperature quickly drops. Suggest an explanation for how a car cooler works.