Solid KF Has a Lattice Energy of -804 KJ/mol and a Heat

question 36

Multiple Choice

Solid KF has a lattice energy of -804 kJ/mol and a heat of solution (in water) of -15 kJ/mol. RbF has a lattice energy of -768 kJ/mol and a heat of solution (in water) of -24 kJ/mol. Which salt forms stronger attractions with water?

• A) They form equally strong attractions with water, because they both have negative heats of mixing.
• B) KF, because it has a more exothermic lattice energy
• C) RbF, because it has a more negative heat of hydration
• D) KF, because it has a more negative heat of hydration
• E) RbF, because it has a less exothermic lattice energy

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Definitions:

Negative Reinforcement

A behavioral principle where the removal or avoidance of an undesirable outcome strengthens the behavior leading to its avoidance.

Punishment

The application of an aversive stimulus following a response in an effort to decrease the likelihood that the response will recur.

Positive Reinforcement

A method in behavioral psychology where the introduction of a rewarding stimulus following a desired behavior increases the likelihood of its recurrence.

Operant-Conditioning

A method of learning in which behavior strength is altered via rewards or penalties.