A System Delivers 222 J of Heat to the Surroundings

question 63

Multiple Choice

A system delivers 222 J of heat to the surroundings while delivering 645 J of work. What is the change in the internal energy, ΔU, of the system?

• A) -423 J
• B) +423 J
• C) -867 J
• D) +867 J
• E) -222 J

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Definitions:

Triglycerides

A combination of glycerol and fatty acids in the blood.

Lipid

A group of naturally occurring molecules that include fats, waxes, sterols, fat-soluble vitamins, monoglycerides, diglycerides, triglycerides, phospholipids, and others.

Cholesterol Molecules

Organic molecules essential for building cell membranes and synthesizing certain hormones and vitamins, but high levels can lead to cardiovascular diseases.

Uric Acid

is a chemical created when the body breaks down substances called purines, its buildup can lead to gout and kidney stones.