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Problem 31

Which statement is true of the internal energy of…

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Problem 31

Which statement is true of the internal energy of a system and its surroundings during an energy exchange with a negative Esys?
a. The internal energy of the system increases, and the internal energy of the surroundings decreases.
b. The internal energy of both the system and the surroundings increases.
c. The internal energy of both the system and the surroundings decreases.
d. The internal energy of the system decreases, and the internal energy of the surroundings increases.
Problem 32

During an energy exchange, a chemical system absorbs energy from its surroundings. What is the sign of Esys for this process? Explain.
Problem 33

Identify each energy exchange as primarily heat or work and determine the sign of E (positive or negative) for the system.
a. Sweat evaporates from skin, cooling the skin. (The evaporating sweat is the system.)
b. A balloon expands against an external pressure. (The contents of the balloon are the system.)
c. An aqueous chemical reaction mixture is warmed with an external flame. (The reaction mixture is the system.)
Problem 34

Identify each energy exchange as primarily heat or work and determine the sign of E (positive or negative) for the system.
a. A rolling billiard ball collides with another billiard ball. The first billiard ball (defined as the system) stops rolling after the collision.
b. A book is dropped to the floor. (The book is the system.)
c. A father pushes his daughter on a swing. (The daughter and the swing are the system.)
Problem 35

A system releases 622 kJ of heat and does 105 kJ of work on the surroundings. What is the change in internal energy of the system?
ES
Eugene S.
University of Minnesota - Twin Cities
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Problem 30

What is lattice energy? How does lattice energy depend on ion size? On ion charge?

Answer

The lattice energy increases with increase in the ionic charge and decreases with decrease in
the ionic charge. Similarly, lattice energy decreases with increase in ionic size and decreases
with increase in ionic size because if the ionic size increases the strength and packing efficiency
of the crystal decreases.

Chapter 9
Thermochemistry
Chemistry Structure and Properties

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Video Transcript

So this question asks about lattice energy and so lattice energy is the energy required to separate a mole of Ionic solid into gashes ions. And so I'd also asks, How is it affected by charge and size? And so, as a charge of the ions increase, thie latice energy will also increase. However, as the size of ions increases, the lattice energy will decrease.

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