Question 1

Involves the study of heat and energy related to various physical transformations and chemical reactions

Accepted Answer

Thermochemistry

Answer

Thermodynamics

Answer

Chemical Chemistry

Answer

<P>Kinetics</P>

Question 2

Which of the following is not a law of thermodynamics?

Accepted Answer

When reactants are converted to products, the change in entropy of the system is the same

Answer

Energy cannot be created or destroyed

Answer

A perfect crystal at zero Kelvin has zero entropy

Answer

For a spontaneous process, the entropy of the universe increases

Question 3

Which of the following is the best way to judge the relative activation energies between two given chemical reactions?

Accepted Answer

Compare their reaction rates

Answer

Compare their ideal environmental conditions

Answer

Compare the ∆G values between the two reactions

Answer

Compare the spontaneity between the two reactions

Question 4

Which of the following is an example of an exothermic reaction?

Accepted Answer

Nuclear fission

Answer

Photosynthesis

Answer

Alkane cracking

Answer

<P>Cooking</P>

Question 5

Consider the following reaction: $H_2\ +F_2\ =\ 2HF$ The bond energy—in kilojoules or kJ—for H2 , F2 and 2HF are 436, 158, and 568 kJ/mole respectively. Which of the following is NOT true about the given reaction?

Accepted Answer

To break one mole of $H_2\ +F_2\ =\ 2HF$ , energy absorbed is 436 kJ.

Answer

The overall enthalpy of the reaction is negative

Answer

One mole of F-F bonds are being broken

Answer

To form two moles of $H_2\ +F_2\ =\ 2HF$ , energy absorbed is $2\cdot\left(568\right)\ kJ$

Question 6

Which of the following is NOT true about energy diagrams for endothermic and exothermic reactions?

Accepted Answer

In an exothermic reaction, the reactants are more stable than the products

Answer

Strong bonds have lower potential energy than weak bonds. Hence, the energy of the reactants is lower than that of the products.

Answer

In the case of an endothermic reaction, the reactants are at a lower potential energy level compared to the products

Answer

In the course of an exothermic reaction, heat flows from the system to its surroundings, and thus, gets warm.

Question 7

Accepted Answer

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