Q: Calculate the change of internal energy, $$\\Delta E$$, of a gas for a process in which the gas absorbs 9 J of heat and does 25 J of work by expanding.

$$\\Delta E = -16 \\ \mathrm{J}$$

Q: Which of the following liquids would you expect to have the highest vapor pressure at room temperature? (All boiling points are normal boiling points)

Diethyl ether, $$b.p. = 34.6^\\circ C$$

Q: Which of the following is a correct Lewis electron-dot formula for CO?

$$:\\mathrm{C}\\equiv\\mathrm{O}:$$

Question 1

A sample of aluminum has a mass of 27.0 g and a volume of 10.0 cm\^3. What is the density of aluminum in g/cm\^3?

Accepted Answer

$$2.70 \ \mathrm{g/cm^3$}$$

Question 2

Which of the following statements about Dalton's Atomic Theory is NOT correct?

Accepted Answer

Atoms are indivisible and indestructible.

Question 3

An atom has 54 protons, 54 electrons, and 78 neutrons. What is its atomic symbol?

Accepted Answer

$$^{132}\mathrm{Xe}$$

Question 4

Which of the following compounds is an ionic compound?

Accepted Answer

$$\mathrm{NaCl}$$

Question 5

A compound contains an unknown ion X and has the formula XCl\_2. Ion X contains 20 electrons. What is the identity of X?

Accepted Answer

$$\mathrm{Ca$$^{2+}$$}$$

Question 6

Which of the following reaction mixtures would produce the greatest amount of NH\_3, assuming all reactants go to completion? The reaction is: $$N_2(g) + 3H_2(g$$) \rightarrow 2NH_3(g)$$

Accepted Answer

1 mole of $$N_2$$ and 6 moles of $$H_2$$

Question 7

Calculate the volume of 0.164 M HNO\_3 required to neutralize 25.0 mL of 0.250 M NaOH.

Accepted Answer

$$38.1 \ \mathrm{mL}$$

Question 8

When an electron in an atom makes a transition from $$n=6 to$$ $$n=4$$, which of the following statements is correct?

Accepted Answer

A photon is emitted.

Question 9

Order the elements Te, I, and Br in terms of increasing atomic radius.

Accepted Answer

Br \u003c I \u003c Te

Question 10

Which of the following molecules has a permanent dipole moment?

Accepted Answer

$$\mathrm{CH_2Cl_2}$$

Question 11

Calculate the change of internal energy, $$\Delta E$$, of a gas for a process in which the gas absorbs 9 J of heat and does 25 J of work by expanding.

Accepted Answer

$$\Delta E = -16 \ \mathrm{J}$$

Question 12

Which of the following liquids would you expect to have the highest vapor pressure at room temperature? (All boiling points are normal boiling points)

Accepted Answer

Diethyl ether, $$b.p. = 34.6^\circ C$$

Question 13

A solid that readily dissolves in water to give a nonconducting solution is most likely:

Accepted Answer

A molecular solid

Question 14

Which of the following best explains why the melting point of NaCl is much higher than that of ice?

Accepted Answer

NaCl has strong ionic bonds, while ice has weaker hydrogen bonds.

Question 15

Which of the following is a correct Lewis electron-dot formula for CO?

Accepted Answer

$$:\mathrm{C}\equiv\mathrm{O}:$$

Question 16

Which of the following substances has the weakest intermolecular forces?

Accepted Answer

$$\mathrm{CH_4$}$$

Question 17

Which of the following best describes the change in vapor pressure of a liquid as temperature increases?

Accepted Answer

Vapor pressure increases exponentially with temperature.

Question 18

Which of the following is NOT a state function?

Accepted Answer

Work

Question 19

Which of the following best describes the triple point in a phase diagram?

Accepted Answer

The temperature and pressure at which all three phases coexist in equilibrium.

Question 20

Which of the following best describes the effect of increasing pressure on the melting point of ice?

Accepted Answer

The melting point of ice decreases with increasing pressure.

General Chemistry I: Comprehensive Study Notes (CHEM 1411 Final Exam Topics)

Guida di studio - Domande di pratica

Study guide - Flashcard