Question 1

Which of the following best defines pressure in terms of fundamental physical quantities?

Accepted Answer

Pressure is defined as force divided by area: $$P = \frac{F}{A}$$

Question 2

A scientist needs to accurately monitor small changes in pressure inside a container using an open-end manometer. For best accuracy, the reference in the manometer should be:

Accepted Answer

A vacuum.

Question 3

A container filled with gas is connected to an open-end U-tube manometer that is filled with mercury. If the difference in the heights of the mercury columns in the manometer is 754 mm and the atmospheric pressure is 1.00 atm, what is the pressure of the gas in the container? (Assume all mercury is fully and measured and 1 atm = 1.013 atm, and 0.82 psi, respectively.)

Accepted Answer

$$1.13$$ atm

Question 4

What is the oxidation number of the sulfur atom in $$SO_2$$?

Accepted Answer

$$+4$$

Question 5

A neutral sulfur atom has how many valence electrons?

Accepted Answer

6

Question 6

Which one of the following is not used to describe the condition of a gas?

Accepted Answer

Color

Question 7

What is the molar concentration of sulfate ions in a $$0.150\ \mathrm{M}\ Na_2SO_4$$ solution?

Accepted Answer

$$0.150\ \mathrm{M}$$

Question 8

At room temperature, which statement is true about ionic compounds?

Accepted Answer

Most ionic compounds are solids.

Question 9

Which of the following species below has 28 protons and 26 electrons?

Accepted Answer

$$Fe^{2+}$$

Question 10

An 'empty' aerosol can at $$25^\circ C$$ still contains gas at $$1.00$$ atmosphere pressure. If an 'empty' can is thrown into a $$475^\circ F$$ fire, what is the final pressure in the heated can? (Assume constant volume. $$475^\circ F = 246^\circ C)$$

Accepted Answer

$$1.75$$ atm

Question 11

If the number of moles of gas is doubled at constant temperature and volume, the pressure of the gas:

Accepted Answer

Is doubled.

Question 12

Butyric acid has the structural formula shown below. What is the molecular or chemical formula for butyric acid?

$$\mathrm{H}-\mathrm{C}-\mathrm{C}-\mathrm{C}-\mathrm{C}-\mathrm{O}-\mathrm{O}-\mathrm{H}$$

Accepted Answer

$$C_4H_8O_2$$

Question 13

Which set do all elements tend to form cations in binary ionic compounds?

Accepted Answer

Li, Na, K

Question 14

The greater the energy of a photon, the:

Accepted Answer

Shorter the wavelength and the higher the frequency: $$E = h 
u = \frac{hc}{\lambda}$$

Question 15

Which reaction liberates the most energy?

Accepted Answer

$$\mathrm{H}_2(g) + \frac{1}{2}\mathrm{O}_2(g) \rightarrow \mathrm{H}_2O(l)$$

Question 16

Given $$4\mathrm{NO}_2(g) + O_2$(g) \rightarrow 2\mathrm{N}_2O_5(g)$$, $$\Delta H^\circ = -110.2\ \mathrm{kJ}$$ and $$\Delta H^\circ$$ for $$2\mathrm{NO}_2(g) \rightarrow \mathrm{N}_2O_4(g) is$$ $$-12.0\ \mathrm{kJ}$$, what is $$\Delta H^\circ$$ for $$2\mathrm{N}_2O_4(g) + O_2$(g) \rightarrow 2\mathrm{N}_2O_5(g)$$?

Accepted Answer

$$-134.2\ \mathrm{kJ}$$

Question 17

Which is the longest bond?

Accepted Answer

$$\mathrm{N}-\mathrm{N}$$

Question 18

Which orbital hybridization is associated with a tetrahedral charge cloud arrangement?

Accepted Answer

$$sp^3$$

Question 19

What is the ground-state electron configuration of the ion $$Hg^{2+}$$?

Accepted Answer

$$[Xe]4f$$^{14}$$5d^{10}6s^0$

Question 20

What is the geometry around the central atom in the following molecular model of $$CCl_4$$?

Accepted Answer

Tetrahedral

Question 21

When a $$1.0\ \mathrm{M}$$ solution of $$NaCl at$$ $$35^\circ C is $$heated to $$55^\circ C$$, the:

Accepted Answer

Density decreases and the molarity increases.

General Chemistry Final Exam Practice: Key Concepts and Applications

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