DAT Science: Gen Chem

Question 1

The carbon atom is located in Group 4A of the periodic table. Carbon can form all of the following except:

A. 4 single bonds

B. 2 double bonds

C. 3 triple bonds

D. ionic bonds

E. both C and D

Answer 1

both C and D. A carbon atom cannot form 3 triple bonds or ionic bonds.

Question 2

Write the equilibrium constant of the following reaction:

CaCO₃ ⇔ CaO + CO₂

Answer 2

[CaO] [CO₂] / [CaCO₃]

Question 3

As the molality of a solution increases, the melting point:

Answer 3

decreases

Question 4

Answer 4

Hess’s Law

Question 5

The half-life of a reactant in a first order reaction

A. is dependent on the initial concentration of the reactant

B. is independent of the initial concentration of the reactant

C. is different for each reactant

D. A and C

E. B and C

Answer 5

is independent of the initial concentration of the reactant

Question 6

According to _________ law, at sufficiently low temperatures and constant pressure the volume of a real gas is a linear function of its temperature.

Answer 6

Charles’s

Question 7

Which of the following does not occur during nuclear fission?

A. Neutrons are released

B. A nucleus splits into two nuclei with smaller mass numbers

C. Energy is consumed

D. An isotope is converted into an isotope of another element.

E. Radioactive decay.

Answer 7

C. Energy is consumed.

Energy is not consumed during nuclear fission.

Question 8

What is the concentration of hydrogen ions in a solution with a pH of 6.0?

A. 1 x 10^-6 M

B. 1 x 10⁶ M

C. 6 x 10^-6 M

D. 6 x 10⁶ M

E. 1 x 10^-8 M

Answer 8

A. 1 x 10^-6 M

Question 9

How many unpaired electrons are present in the Lewis-Dot diagram of sulfur trioxide?

A. 0

B. 4

C. 8

D. 24

E. None of the above

Answer 9

While there are 12 or 16 unbonded electrons (depending on the resonance structure of sulfur trioxide), none of them are unpaired. So, the correct answer is zero.

Question 10

Which of the following does NOT describe an ideal gas?

A. It does not condense into a liquid when it is cooled

B. It obeys all of the gas laws under all conditions

C. Its behavior is more ideal at lower temperatures than higher temperatures

D. Its behavior is more ideal at lower pressures

E. It contains non-interacting particles moving in random motion

Answer 10

Its behavior is more ideal at lower temperatures than higher temperatures

Question 11

What is it called when a gas becomes a solid?

Answer 11

Deposition

Question 12

A solution is formed by dissolving 12.5 grams of sucrose in 0.100 kg of water. What is the percent mass of solute in this solution?

A. 8.0%

B. 11.11%

C. 12.5%

D. 0.8%

E. 125%

Answer 12

12.5 g / (12.5 g + 100 g) = 11.11%

Question 13

Species that gains electrons in a reaction are often referred to as:

Answer 13

oxidants and oxidizing agents

Question 14

Which of the following is a weak acid?

A. HCl

B. HNO₃

C. H₂SO₄

D. CH₃COOH

E. KOH

Answer 14

CH₃COOH

Question 15

Of the following, which is not an intermolecular force that exists in molecules?

A. Covalent bonds

B. Van der Waals interactions

C. Hydrophobic interactions

D. Hydrogen bonding

E. London dispersion

Answer 15

A. Covalent bonds

Question 16

In a saturated solution that is allowed to form in a flask at room temperature,

A. an undissolved solute remains in the flask

B. the solvent holds as much solute as possible at all temperatures

C. The dissolved solute is not in dynamic equilibrium with the solid particles of the solute

D. The solvent holds more solute than is normally possible at room temperature

E. none of the solute’s particles remain in the flask

Answer 16

A. an undissolved solute remains in the flask

Question 17

Bronsted-Lowry bases

A. accept H⁺

B. donate H⁺

C. accept electron pairs

D. turns litmus paper red

E. A and D

Answer 17

A. accept H⁺