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Pharmaceutical Procedures: Heat & Cold

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Questions and Answers

What is the primary reason for faster evaporation in an area of low pressure?

There is less exertion on the surface keeping the molecules from launching themselves (correct)

Molecules have less energy to escape

Molecules are more densely packed

Molecules have a lower boiling point

Why does a substance with a larger surface area evaporate faster?

Because there are more surface molecules that can escape (correct)

Because the density of the substance decreases

Because the temperature of the substance increases

Because there are fewer molecules at the surface

What is the relationship between the density of a substance and its evaporation rate?

Density has no effect on evaporation rate

Higher density results in faster evaporation

Higher density results in slower evaporation (correct)

Lower density results in faster evaporation

What is the effect of increasing the temperature of a substance on its evaporation rate?

It increases the evaporation rate (C) Signup and view all the answers

What is boiling, in terms of phase transitions?

A rapid vaporization of a liquid (D) Signup and view all the answers

Under what conditions can a liquid boil besides being heated to its boiling point?

Only when the surrounding pressure is reduced (D) Signup and view all the answers

What is the primary reason why the molecules in a glass of water do not quickly turn into vapor?

They do not have enough heat energy to escape (A) Signup and view all the answers

What happens to the molecules when they collide during the evaporation process?

They transfer energy to each other (A) Signup and view all the answers

What is the typical temperature at which a liquid boils, according to the surrounding pressure?

The temperature at which the vapor pressure equals the surrounding pressure (C) Signup and view all the answers

What is the result of a one-sided energy transfer during the evaporation process?

The molecule gains enough energy to escape (B) Signup and view all the answers