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Test: Chemistry for the Biosciences - Grade 10 MCQ


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10 Questions MCQ Test Physics for Grade 10 - Test: Chemistry for the Biosciences

Test: Chemistry for the Biosciences for Grade 10 2024 is part of Physics for Grade 10 preparation. The Test: Chemistry for the Biosciences questions and answers have been prepared according to the Grade 10 exam syllabus.The Test: Chemistry for the Biosciences MCQs are made for Grade 10 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Chemistry for the Biosciences below.
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Test: Chemistry for the Biosciences - Question 1

Energy is measured in which of the following units?

Detailed Solution for Test: Chemistry for the Biosciences - Question 1

Energy is measured in Joules (J). However, we often express the quantity as kilojoules (kJ) - that is, the value in Joules divided by 1000.

Test: Chemistry for the Biosciences - Question 2

The formation of a chemical bond releases energy. True or false?

Detailed Solution for Test: Chemistry for the Biosciences - Question 2

The formation of a bond does release energy. By contrast, the process of cleaving (or breaking) a bond requires the input of energy.

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Test: Chemistry for the Biosciences - Question 3

Which one of the following statements regarding energy is false?

Detailed Solution for Test: Chemistry for the Biosciences - Question 3

The first law of thermodynamics essentially states that the total energy in a chemical universe is constant but it can be converted from one form to another. There are two main types of energy - kinetic energy (energy associated with motion), and potential energy (stored energy). An object suspended in the air has more potential gravitational energy than an object lying on the ground. The energy stored in chemical bonds is also a type of potential (stored) energy, not a type of kinetic energy.

Test: Chemistry for the Biosciences - Question 4

In which direction does the transfer of energy as heat happen spontaneously?

Detailed Solution for Test: Chemistry for the Biosciences - Question 4

Heat is the transfer of energy from a region of high temperature to a region of lower temperature - that is, from hot to cold. This process happens spontaneously, without the input of effort or work to make it happen.

Test: Chemistry for the Biosciences - Question 5

Which one of the following statements best describes the enthalpy change of a reaction?

Detailed Solution for Test: Chemistry for the Biosciences - Question 5

The enthalpy change of a reaction is the overall change in enthalpy as a reaction proceeds, taking into account the energy consumed by bond cleavage and the energy liberated by bond formation. The increase in disorder of the system is represented by its entropy, not its enthalpy.

Test: Chemistry for the Biosciences - Question 6

Enthalpy is represented by which of the following symbols?

Detailed Solution for Test: Chemistry for the Biosciences - Question 6

A number of different symbols are used to represent different thermodynamic entities; the enthalpy is represented by the symbol H.

Test: Chemistry for the Biosciences - Question 7

Which of the following terms describes a reaction in which there is a net transfer of energy from a system to its surroundings - that is, where more energy is released by bond formation than is consumed by bond cleavage?

Detailed Solution for Test: Chemistry for the Biosciences - Question 7

One way to remember this is to link 'exo' with 'exterior' (or the outside) - so 'exothermic' is the flow of energy out of the system to its surroundings. By contrast, 'endo' means 'inside', so 'endothermic' describes a reaction in which there is a flow of energy into the system from its surrounding

Test: Chemistry for the Biosciences - Question 8

The enthalpy of combustion of glucose is -2808 kJ mol-1. Which one of the following statements regarding this process is false?

Detailed Solution for Test: Chemistry for the Biosciences - Question 8

A system with lower energy is more stable than a system with higher energy. If the enthalpy change for a reaction (such as the combustion of glucose) is negative, then energy must be released by the system during the reaction such that the system has lower energy after the reaction than before. In this case, the products of the combustion of glucose must be more stable than glucose itself.

Test: Chemistry for the Biosciences - Question 9

When a polypeptide chain folds to adopt its characteristic three-dimensional state, its entropy increases. True or false?

Detailed Solution for Test: Chemistry for the Biosciences - Question 9

Entropy is the measure of disorder in a system (or its surroundings). When a polypeptide folds, it becomes more organised (that is, less disordered) so its entropy decreases. So this statement is false.

Test: Chemistry for the Biosciences - Question 10

Which of the following statements regarding the Gibbs free energy change for a reaction is false?

Detailed Solution for Test: Chemistry for the Biosciences - Question 10

The Gibbs free energy change of a reaction gives a measure of the energy from a reaction that is available to do something useful (that is, to do work) once some of the energy has been used to increase the entropy; it isn't the amount of energy that is used to increase the entropy, however.

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