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Test: Enthalpies for Different Types of Reactions - Chemistry MCQ


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10 Questions MCQ Test - Test: Enthalpies for Different Types of Reactions

Test: Enthalpies for Different Types of Reactions for Chemistry 2024 is part of Chemistry preparation. The Test: Enthalpies for Different Types of Reactions questions and answers have been prepared according to the Chemistry exam syllabus.The Test: Enthalpies for Different Types of Reactions MCQs are made for Chemistry 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Enthalpies for Different Types of Reactions below.
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Test: Enthalpies for Different Types of Reactions - Question 1

Enthalpy of combustion as always ________

Detailed Solution for Test: Enthalpies for Different Types of Reactions - Question 1

Enthalpy of combustion is the enthalpy change that takes place when one mole of a compound undergoes complete combustion in the presence of oxygen. It is represented by ΔHc, it is always negative because the process of combustion is exothermic.

Test: Enthalpies for Different Types of Reactions - Question 2

The enthalpy of 435 KJ per Mol is obtained from the conversion of hydrogen molecule into two hydrogen atoms.

Detailed Solution for Test: Enthalpies for Different Types of Reactions - Question 2

The enthalpy change that occurs when one mole of a molecule breaks into its atoms is known as enthalpy of atomization. The energy released during the conversion of a hydrogen molecule into two hydrogen atoms is enthalpy of atomization.

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Test: Enthalpies for Different Types of Reactions - Question 3

In case of the decomposition of hydrogen molecule into two hydrogen atoms, the enthalpy of atomization is same as the _________

Detailed Solution for Test: Enthalpies for Different Types of Reactions - Question 3

In case of the decomposition of hydrogen molecule the enthalpy is the same as enthalpy of atomization as well as bond dissociation enthalpy because the bond association enthalpy refers to the breakage of H-H Bond. So that two hydrogen atoms are formed whereas enthalpy of atomization is the breakage of hydrogen molecules in order to form two atoms.

Test: Enthalpies for Different Types of Reactions - Question 4

Decomposition of sodium chloride into a sodium ion and chloride ion releases energy of 788 KJ per Mol, what is the energy called?

Detailed Solution for Test: Enthalpies for Different Types of Reactions - Question 4

Lattice enthalpy is the enthalpy change when one molecule of an ionic compound dissociates into its ions and gaseous state. Here sodium chloride is an ionic compound and it decomposes into sodium and chloride ions, so the energy released is lattice energy.

Test: Enthalpies for Different Types of Reactions - Question 5

Enthalpy of solution can either be positive or ________

Detailed Solution for Test: Enthalpies for Different Types of Reactions - Question 5

Enthalpy change when 1 mole of a substance is dissolved in a large excess of solvent so that on further delusion no appreciable heat change occurs, is known as enthalpy of solution. It can either be positive or negative depending on the reaction, whether it is exothermic or endothermic.

Test: Enthalpies for Different Types of Reactions - Question 6

Calculate the heat of combustion of ethane, in the reaction C2H6(g) + 3 1/2O2(g) → 2CO2(g) + 3H2O(l) where the heats of formation of ethane gas, carbon dioxide gas and water liquid are –84.7 kJ mol-1, -393.5 kJ mol-1 and –285.8 kJ mol-1 respectively.

Detailed Solution for Test: Enthalpies for Different Types of Reactions - Question 6

Given that C2H6(g) + 3 1/2 O2(g) → 2CO2(g) + 3H2O(l) As we know that, ΔHr = Σ ΔHf[products] – Σ ΔHf[reactants]; ΔHc(C2H6) = 2 X (-393.5 kJ mol-1) + 3 X (-285.8 kJ mol-1) – (- 84.7 kJ mol-1) – 2 X (0 kJ mol-1) = ΔHc(C2H6) = – 1559.7 kJ mol-1.

Test: Enthalpies for Different Types of Reactions - Question 7

In which of the following reactions the energy released is not an enthalpy of atomization?

Detailed Solution for Test: Enthalpies for Different Types of Reactions - Question 7

The enthalpy of atomization is an enthalpy change that occurs when one molecule of a molecule breaks into its atoms, but here the of a water molecule formation does not satisfy the definition of the enthalpy of atomization.

Test: Enthalpies for Different Types of Reactions - Question 8

Calculate the carbon carbon double bond energy in ethane from the following reaction, H2C = CH2(g) + H2(g) → H3C−CH3(g) ΔH = −138 kJ/mol. If Bond enthalpies are: C−C = 348; H−H = 436; C−H = 412 in KJ/mol.

Detailed Solution for Test: Enthalpies for Different Types of Reactions - Question 8

By following the rule ΔHr = Σ ΔHf[products] – ∑ ΔHf[reactants], we get -(x + 4(412) + 432) + (348 + 6(412)) = -138 KJ/mol; x = 598 KJ/mol. So the carbon carbon double bond energy in Ethane is given as 598 KJ per Mol.

Test: Enthalpies for Different Types of Reactions - Question 9

Which of the following cycle allows has to analyze reaction energies?

Detailed Solution for Test: Enthalpies for Different Types of Reactions - Question 9

An indirect method, in which we can construct an enthalpy diagram is called a Born-Haber cycle as it is nearly impossible to determine lattice enthalpies directly by experiment. It is an approach to analyze reaction energies.

Test: Enthalpies for Different Types of Reactions - Question 10

The enthalpy of dilution of a solution is __________ on the original concentration of the solution and the amount of solvent added.

Detailed Solution for Test: Enthalpies for Different Types of Reactions - Question 10

Enthalpy of dilution is the enthalpy change when 1 mole of a substance is diluted from one concentration to another. So it is dependent on your original concentration of the solution and the amount of solvent added.

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