Ch.5 Matter & Heat

Molecular motion in a gas is the minimum possible at what temperature?

0 k

The freezing point of a water is 0c, what is it melting point?

0c

The density of brass is 8.4g/cm3. What is the volume occupied by 200g of brass?

24cm3

A temperature of 100F is almost exactly what?

38c

Which of the following formulas relating temperatures on the Celsius and Fahrenheit scales is correct?

Tc = (TF -32)/1.8

A Celsius thermometer and an absolute thermometer are used to measure the temperature of the same gas sample. The readings on the thermometers are respectively Tc and Tk

Tc is smaller than Tk

A barometer measures which of the following

atmospheric pressure

The freezing point of a substance is always lower than it?

boiling point

In order to operate, a heat engine must have what?

both a hot and cold reservoir

Which of the following quantities is independent of the size and shape of an object composed of a given material?

density

Molecules are, in general, farthest apart from one another in

gases

When a vapor condenses into a liquid, what happens?

it gives off heat

What is true of a refrigerator?

it removes heat from a region and carries it elsewhere

Heat conduction is most efficient in what type of substance?

metals

In order for an object to sink when placed in water, the objects average density must be what?

more than that of water

A refrigerator gives off

move heat than it absorbs from its contents

Heat can be transferred through a vacuum by which one or more of the following?

radiation

The temperature of a gas sample in a rigid container is raised. Why does the pressure the gas exerts on the container walls increase?

the molecules have higher average speeds and so strike the walls more often with greater momentum

Of the following, a molecule is best described as what?

the smallest particle of a substance that is representative of the substance