Question 1

A sample of nitrogen gas occupies a volume of 2.50 L at 300 K and 1.00 atm. If the gas is compressed to 1.25 L and heated to 400 K, what is the new pressure of the gas, assuming ideal behavior?

Accepted Answer

$$P_2$$ = \frac{$$P_1$$ $$V_1$$ $$T_2$$}{$$T_1$$ $$V_2$$} = \frac{1.00 	imes 2.50 	imes 400}{300 	imes 1.25} = 2.67\ 	ext{atm}$$

Question 2

Which of the following best explains why real gases deviate from ideal gas behavior at high pressures and low temperatures?

Accepted Answer

Intermolecular forces and the finite volume of gas particles become significant.

Question 3

A solution is prepared by dissolving 10.0 g of NaCl in 100.0 g of water. Which of the following best describes the solute and solvent in this solution?

Accepted Answer

NaCl is the solute and water is the solvent.

Question 4

Which of the following statements about the Kinetic Molecular Theory is correct?

Accepted Answer

Gas particles are in constant, random motion and collisions between them are elastic.

Question 5

Which of the following best describes the process of crystallization from a supersaturated solution?

Accepted Answer

A small disturbance or seed crystal causes excess solute to rapidly precipitate out.

Question 6

Which of the following equations correctly represents the rate law for a reaction that is first order in A and second order in B?

Accepted Answer

$$	ext{Rate} = k[A][B]^2$$

Question 7

A chemical reaction has an activation energy of $$50\ 	ext{kJ/mol}. If $$the temperature is increased, what happens to the rate constant $$k$$ according to the Arrhenius equation?

Accepted Answer

The rate constant $$k$$ increases because more molecules have enough energy to overcome the activation barrier.

Question 8

Which of the following best explains why ionic solids tend to have high melting points?

Accepted Answer

Strong electrostatic forces between oppositely charged ions require a large amount of energy to break.

Question 9

A solution of glucose in water has a lower vapor pressure than pure water. This is an example of which colligative property?

Accepted Answer

Vapor pressure lowering

Question 10

Which of the following best describes the difference between a crystalline solid and an amorphous solid?

Accepted Answer

Crystalline solids have long-range order, while amorphous solids lack a regular repeating structure.

Question 11

Which of the following is the correct expression for the van't Hoff factor $$i$$ for a solution of $$	ext{Na}_2	ext{SO}_4 in $$water, assuming complete dissociation?

Accepted Answer

$$i = 3$$

Question 12

A catalyst increases the rate of a chemical reaction by:

Accepted Answer

Providing an alternative pathway with a lower activation energy.

Question 13

Which of the following best describes the effect of increasing the concentration of a reactant on the rate of a reaction, assuming the reaction is first order with respect to that reactant?

Accepted Answer

The rate increases linearly with the concentration of the reactant.

Question 14

Which of the following is a correct statement about the boiling point elevation of a solution?

Accepted Answer

The boiling point of a solution is higher than that of the pure solvent due to the presence of a nonvolatile solute.

Question 15

Which of the following best explains why water is an effective solvent for ionic compounds?

Accepted Answer

Water molecules are polar and can surround and stabilize ions in solution.

Question 16

A reaction is found to be second order overall. If the concentration of reactant A is doubled and the concentration of reactant B is tripled, and the rate law is $$	ext{Rate} = k[A][B]$$, by what factor does the reaction rate increase?

Accepted Answer

The rate increases by a factor of 6.

Question 17

Which of the following best describes the structure of a metallic solid?

Accepted Answer

A lattice of positive metal ions surrounded by a sea of delocalized electrons.

Question 18

Which of the following is the correct formula for calculating the osmotic pressure $$\Pi of a $$dilute solution?

Accepted Answer

$$\Pi = iMRT$$

Question 19

Which of the following best explains why the rate of a reaction generally increases with temperature?

Accepted Answer

More molecules have sufficient kinetic energy to overcome the activation energy barrier.

Question 20

Which of the following best describes the difference between a molecular solid and an ionic solid?

Accepted Answer

Molecular solids are held together by intermolecular forces, while ionic solids are held together by electrostatic attractions between ions.

General Chemistry Study Guide: States of Matter, Solutions, and Chemical Kinetics

Guida di studio - Domande di pratica

Study guide - Flashcard