General Chemistry, Second-Term Practice Items

What is the molar concentration of a 2.52 m aqueous sugar (sucrose, C₁₂H₂₂O₁₁) solution?

• 1.66 M

• 2.05 M

• 3.10 M

• 3.60 M

Other than dispersion forces, what is the predominant intermolecular force present in a solution of methanol and carbon tetrachloride?

• ion-dipole forces

• ion-induced dipole forces

• dipole-dipole forces

• dipole-induced dipole forces

In order to determine the change in freezing point of 5.0 g of NaCl in 75 g of water, what needs to be included in the calculation?

• I., II., and IV.

• I., II., III. and IV.

• I., IV., and V.

• I., IV., V. and VI.

You have two solutions both at 25°C: (1) 50.0 g of KBr in 100 g of water (2) 50.0 g of KNO₃ in 100 g of water Using the solubility curve shown, which statement is true?

• Both are saturated.

• Both are unsaturated.

• Only KBr(aq) is saturated.

• Only KNO3(aq) is saturated.

A series of experiments were carried out for a reaction: 2A + B → C. Based on the data, what is the rate law?

• rate = k[A]

• rate = k[A][B]

Tags

NGSS.HS-PS1-5

There are two reactions with the two rate constants shown to the right. What can you conclude about these reactions?

• Reaction 1 is faster than reaction 2. Both reactions are first order.

• Reaction 1 is slower than reaction 2. Both reactions are first order.

• Reaction 1 is faster than reaction 2. Both reactions are second order.

• Reaction 1 is slower than reaction 2. Both reactions are second order.

Tags

NGSS.HS-PS1-5

The first-order, radioactive decay of nitrogen-16 is 7.1 seconds. What fraction of a sample of nitrogen remains after 3 half-lifes (or 21.3 seconds) has elapsed?

• 1/3

• 1/6

• 1/8

• 1/9

Tags

NGSS.HS-PS1-8

For a reaction, a series of experiments were carried out, and the rate of the reaction was measured over time. The generic reaction is: A → products. Which statement is correct?

• If the plot of [A] vs. time is nonlinear, the reaction is zero order.

• If plot of [A] vs. time is nonlinear, the reaction is first order.

• If plot of ln[A] vs. time is linear, the reaction is zero order.

• If plot of ln[A] vs. time is linear, the reaction is first order.

Tags

NGSS.HS-PS1-5

Which mechanism is consistent with the energy diagram?

• Step 1: A→E

• Step 1: A→B; Step 2: C→D

• Step 1: A→C; Step 2: C→E

• Step 1: B→B; Step 2: B→C; Step 3: C→D; Step 4: D→E

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

For the energy diagram shown, what are the relationships between the activation energies (Ea1 and Ea2) and the rate constants (k1 and k2)?

• Ea1 < Ea2; k1 < k2

• Ea1 < Ea2; k1 > k2

• Ea1 > Ea2; k1 < k2

• Ea1 > Ea2; k1 > k2

Tags

NGSS.HS-PS1-4

NGSS.HS-PS1-5