Chemistry Questions
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If force is held constant as surface area decreases, pressurea. increases.b. decreases.c. remains constant.d. increases or decreases, depending on the volume change.
Which of the following is an absolute scale?a. Celsiusb. Kelvinc. Fahrenheit
Which of the following could work without an atmosphere?a. a lighterb. a digital scalec. a strawd. a helicopter
What determines the average kinetic energy of the molecules of any gas?a. pressureb. temperaturec. container volumed. molar mass
Which of the following best explains why air pressure decreases as you climb up a mountain?a. the density of the air is increasingb. gravity gets stronger as you climbc. there is less air above youd. gravity is getting weaker
T or F Pressure and temperature have a direct relationship.
Which is an example of gas diffusion?a. inflating a flat tireb. the odor of perfume spreading throughout a roomc. a cylinder of oxygen stored under high pressured. All of the above
Two sealed flasks, A and B, contain two differnt gases of equal volume at the same temperature and pressure. Assume that flask A is warmed as flask B cools. What will happen?a. pressure will remain the sameb. flask A will have a higher pressure than flask Bc. flask B will have a higher pressure than flask A
T or F Ideal gases are unable to condense and stay together as liquids or solids.
A helium balloon is released and floats upward. What will eventually happen to the size of the balloon as the atmospheric pressure drops? Assume that there is no change in temperature.a.I'll be honest...I have no idea.b.The balloon's size will increase.c.There will be no change in the balloon's size.d.The balloon's size will decrease.
A real gasa. consists of particles that do not occupy space.b. cannot be condensed.c. will have perfect elastic collisions.d. does not obey all the assumptions of the kinetic-molecular theory.
For which of the following do we have some units that are not an absolute scale?a. amountb. volumec. temperatured. pressure
Which of the following best explains why gases are compressible?a. gases are the most energetic state of matterb. they vibrate in placec. the particles have no attraction for each otherd. gases have a very low density
T or F The equation for kinetic energy is 2mv2
T or F Gases tend to diffuse from areas of high concentration to areas of low concentration.
Which of the following factors does not affect the rate of diffusion of one gas through another?a. molar volume of the gasesb. pressure of the gases (how close together they are)c. temperature of the gasesd. molar mass of the gases
The accepted values for STP(standard temperature and pressure) are _.
T or F In an elastic collision, the total amount of kinetic energy is conserved.
Which is an example of effusion?a. air slowly escaping from a pinhole in a tireb. the aroma of a cooling pie spreading across a roomc. oxygen and gasoline fumes mixing in an automobile carburetord. helium dispersing into a room after a balloon pops
According to the kinetic-molecular theory, particles of an ideal gasa. repel each other and collide.b. attract each other but do not collide.c. neither attract nor repel each other but collide.d. neither attract nor repel each other and do not collide.