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Test: Chemical Energetics - Year 3 MCQ


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10 Questions MCQ Test - Test: Chemical Energetics

Test: Chemical Energetics for Year 3 2024 is part of Year 3 preparation. The Test: Chemical Energetics questions and answers have been prepared according to the Year 3 exam syllabus.The Test: Chemical Energetics MCQs are made for Year 3 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Chemical Energetics below.
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Test: Chemical Energetics - Question 1
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Pick the correct combination for the correct information regarding bond energies.

Detailed Solution for Test: Chemical Energetics - Question 1

Remember Exothermic Exit and Endothermic Enter

Test: Chemical Energetics - Question 2
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The overall energy change in a chemcial reaction is -24kJ/mol. What does this tell us about the reaction?

Detailed Solution for Test: Chemical Energetics - Question 2
A negative energy change shows the reaction is exothermic and so heat and/or other energy has been transferred into the surroundings, often increasing the temperature
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Test: Chemical Energetics - Question 3
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Using the bond energies provided, calculate the energy change for this reaction.
2CH4 + O2 → 2CH3OH

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When carrying out these calculations, always subtract the reactants energy from the products

Test: Chemical Energetics - Question 4
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In the Haber process, nitrogen and hydrogen are reacted together to produce ammonia. Use the bond energies provided to calculate the overall energy change in the reaction.
N2 + 3H2 ⇌ 2NH3
Detailed Solution for Test: Chemical Energetics - Question 4

945 + (3x436) - (6x-391) = -93kJ

Test: Chemical Energetics - Question 5
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Use the bond energies provided to calculate the energy change in the following reaction.
H2 + Cl2 → 2HCl
Detailed Solution for Test: Chemical Energetics - Question 5

Bond breaking = 436+243kJ/mol; bond making 2x432kJ/mol

Test: Chemical Energetics - Question 6
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Use the bond energies provided to calculate the energy change in the following reaction.
oxygen + hydrogen → water
Detailed Solution for Test: Chemical Energetics - Question 6

Add together the energy of each bond of the reactants, do the same for the bonds in the products. Then subtract the total bond energy of the reactants from that of the products to get the answer

Test: Chemical Energetics - Question 7
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Use the bond energies provided to calculate the amount of energy given out when propane is burnt.
C3H8 + 5O2 → 3CO2 + 4H2O
Detailed Solution for Test: Chemical Energetics - Question 7

Remember that CO2 has 2 C=O double bonds not single bonds

Test: Chemical Energetics - Question 8
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Which of the following statements describes an exothermic reaction?
Detailed Solution for Test: Chemical Energetics - Question 8

An exothermic reaction releases heat to the surroundings, making it feel warm.

Test: Chemical Energetics - Question 9
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What is the role of enzymes in biological reactions?
Detailed Solution for Test: Chemical Energetics - Question 9

Enzymes are biological catalysts that accelerate chemical reactions in living organisms without being consumed in the process.

Test: Chemical Energetics - Question 10
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What does the term 'enthalpy' represent in a chemical reaction?
Detailed Solution for Test: Chemical Energetics - Question 10

Enthalpy is the total heat content of a system at constant pressure, including both the internal energy and the product of pressure and volume.

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