Question 1

The space-filling representation provided below is an example of which type of unit cell, and how many atoms does it contain?

![unit cell image](media/image1.gif)

Accepted Answer

face-centered cubic, 4 atoms

Question 2

Which component of the reaction mixture is represented by curve B in the diagram below, given the reaction CO(g) + 3H2(g) → CH4(g) + H2O(g)?

![equilibrium diagram](media/image11.gif)

Accepted Answer

either methane or water

Question 3

What is the simplest formula of the compound represented by the unit cell provided below?

![unit cell formula image](media/image2.gif)

Accepted Answer

AB

Question 4

In the context of the diagram given below, which of the following statements is true concerning half-cell II?

![electrochemical cell diagram](media/image28.gif)

Accepted Answer

[Cu2+] decreases with time, and [K+] increases with time.

Question 5

Which of the statements concerning the phase diagram below is/are correct?

![phase diagram](media/image3.gif)

1. Only the solid phase exists at point A.
2. At point C, the solid and liquid phases are in equilibrium.
3. At point D, the critical point, the substance exists as a supercritical fluid.

Accepted Answer

1 only

Question 6

A face-centered cubic unit cell contains atoms at each corner and at the center of each face. If the edge length of the cell is $$a$$, what is the relationship between the atomic radius $$r$$ and the edge length $$a$$ for a face-centered cubic cell?

Accepted Answer

$$r = \frac{a\sqrt{2}}{4}$$

Question 7

Given the phase diagram above, what happens to the substance at point D?

Accepted Answer

Only the solid phase exists.

Question 8

In the equilibrium diagram shown, which curve represents the reactant that was initially present in excess?

Accepted Answer

Curve A

Question 9

The unit cell shown below contains two types of atoms, A (yellow) and B (white). If A atoms are at the corners and B atoms are at the body center, what is the formula of the compound?

![unit cell formula image](media/image2.gif)

Accepted Answer

AB

Question 10

Which of the following best describes the change in the number of moles of reactants and products over time in the equilibrium diagram shown?

![equilibrium diagram](media/image11.gif)

Accepted Answer

Reactants decrease, products increase, and both reach constant values at equilibrium.

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