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Today water boils at 100oC. The weatherman says a low pressure system is moving into your area tomorrow. What will the boiling point of water be tomorrow?
less than 100 o
Nitrogen is liquified from an air sample at -200oC. This is an example of what kind of process?
exothermic
A liquid is changed to a gas. What type of process is this?
endothermic
A compressed air cylinder has a total pressure of 10,000 mmHg. The partial pressures exerted by individual gas components are: nitrogen-7254 mmHg, oxygen-2132 mmHg, other gases-386 mmHg. Assume that water vapor is the only remaining component. What is the partial pressure of the water vapor?
228 mmHg
A marshmallow can be thought of as a small balloon. At room temperature and pressure (25oC, 1 atm) the marshmallow has a volume of 20 mL. The marshmallow is then put in a pressure chamber at room temperature and the pressure is changed until the marshmallow has a volume of 30 mL. What is the pressure (in atm) exerted on the marshmallow?
0.7 atm
Because of their thick rubber and polyester belting, car tires can be thought of as having a constant volume, even though their shape changes. You fill your car tires to 32 psi with air on a hot summer day. Two months later the weather turns cold and you check the air pressure in your tires. Assuming no leaks, what pressure reading will you find?
less than 32 psi
A gas becomes a liquid at -125oC. What temperature is this on the Kelvin scale?
148 K
A balloon is filled with 3.0 L of helium at 20oC. At what temperature will the balloon be one-half that volume (1.5 L)?
-127oC
An air-filled balloon contracts as it cools down because
the speed of the particles decreases
Which of the following interparticle forces would account for the definite shape of a solid?
strong cohesive and weak disruptive forces
As a liquid is heated, the vapor pressure of the liquid will
increase
Results from attractions or repulsions between particles
potential energy
Describes how pressure affects the volume of a gas at a given temperature
Boyle's law
A measurement related to the mass and velocity (speed) of particles
kinetic energy
The attraction between particles that gives them potential energy
cohesive force
The temperature at which all molecular motion stops.
absolute zero
Describes how temperature affects the volume of a gas kept at constant pressure.
Charles' law
Temperature at which the vapor pressure of a liquid is equal to the atmospheric pressure above the liquid
boiling point
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