General Chemistry Final Exam Review Spring ‘14

Aqueous solutions of acids a)are not found in the human body b)have very high boiling points c)conduct electricity d)cannot be prepared c (acid solutions contain ions)

A reaction that happens spontaneously without an enthalpy change a)is impossible b)becomes more ordered c)becomes more disordered d)releases heat c

Which of the following represents the pH of a solution? a)log[H 3 O + ] b)- log[H 3 O + ] c)log[OH - ] d)-log[OH - ] b

The pressure of a sample of gas increases from 450. mmHg to 500. mmHg. If the volume is constant, and the temperature of the gas was 0.0 ºC, what is the new gas temperature (in ºC)? 30. ºC

What is the effect of adding more water to the following equilibrium reaction? CO 2 + H 2 O  H 2 CO 3 More H 2 CO 3 is produced. CO 2 concentration increases. The equilibrium is pushed in the direction of reactants. There is no effect. More H 2 CO 3 is produced.

Compared to gases before diffusion, gases after diffusion have a)more entropy b)less entropy c)more enthalpy d)none of these is correct a (mixing of anything increases disorder)

For the reaction: 3Fe + 4H 2 O  Fe 3 O 4 + 4H 2 how many liters of hydrogen are produced from 500 g of iron at STP? 300 L H 2

Which of the following is true about the free energy change for a spontaneous reaction? a.It is not related to enthalpy. b.It is negative. c.It indicates that work must be expended. d.It is positive for temperatures above 850C. Ans: B

Which type of solution is one with a pH of 8? a.Acidic b.Basic c.Neutral d.The type varies, depending on the solution.

Which of the following gases is the best choice for inflating a balloon that must remain inflated for a long period of time? a.argon b.hydrogen c.oxygen d.neon Ans: A (the largest gas effuses slowest)

In an exothermic reaction, the energy stored in the chemical bonds of the reactants is ____. a.equal to the energy stored in the bonds of the products b.greater than the energy stored in the bonds of the products c.less than the energy stored in the bonds of the products d.less than the heat released Ans: B

The amount of heat needed to melt one gram of a solid at a constant temperature is called ____. a.heat of fusion b.heat of reaction c.heat of solidification d.Enthalpy Ans: A

Why is a gas easier to compress than a liquid or a solid? a.Its volume increases more under pressure than an equal volume of liquid does. b.Its volume increases more under pressure than an equal volume of solid does. c.The space between gas particles is much less than the space between liquid or solid particles. d.The volume of a gas’s particles is small compared to the overall volume of the gas. Ans: D

Consider the reaction N(g) 3H(g)  2NH(g). What is the effect of decreasing the volume on the contained gases? a.The reaction shifts forward. b.The system reacts by increasing the number of gas molecules. c.The pressure on the gases decreases momentarily. d.Ammonia is consumed in the reaction.

In an exothermic reaction, the enthalpy of the reactants is ____. equal to the enthalpy of the products greater than the enthalpy of the products less than the enthalpy of the products less than the he Greater than the enthalpy of the products.