Molecular Motion
State of the Matter
It's a gas
Thermal energy transfer
IDK
100
Which phases of matter show increasing molecular motion at a given temperature?
a. gas, liquid, solid b. solid, liquid, gas c. solid, gas, liquid d. liquid, gas, solid
100
What happens when air is heated?
a. the weight of the air decreases b. the air particles move faster c. the composition of the air changes d. the number of particles in the air changes
100
According to Boyle's law, when temperature is constant
a. pressure increases cause a volume decrease b. pressure increases cause a volume increase c. pressure and volume stay the same d. Nothing - Charles law keeps temperature constant
100
A frying pan is made completely of iron. How does heat transfer to the handle of the pan as it is heated on a stove?
a. free electrons move from atom to atom b. heat flows through the space between atoms c. Iron atoms transfer kinetic energy to other iron atoms d. rapidly vibrating atoms move away from the heat source
100
Four beakers are filled with chilled water, tap water, lukewarm water, and boiling water, repesctively. Which beaker will show the fastest mixing after the addition of a few drops of colored dye?
a. Beaker D b. Beaker A c. Beaker C d. Beaker B
200
Which list shows the correct order of increasing molecular motion at a given temperature?
a. helium, wood, water, iron b. helium, iron, water, wood c. iron, wood, water, helium d. helium, water, wood, iron
200
How can you determine which gas sample has the highest kinetic energy?
a. by finding the temperature of each sample b. by finding the heat content of each sample c. by finding the pressure and volume of each sample d. by finding the average molecular weight of each sample
200
According to Charles law, with a constant pressure
a. temperature increases cause a volume decrease b. temperature increases cause a volume increase c. temperature and volume stay the same d. Nothing - Boyle's law keeps pressure constant
200
Gas pressure can be measured on a surface because gas molecules will _____________ on the surface.
a. float b. collide c. mix d. diffuse
200
What do the flat lines in a phase change diagram represent?
a. stable potential energy and stable kinetic energy b. increasing potential energy and stable kinetic energy c. stable potential energy and increasing kinetic energy d. increasing potential and increasing kinetic energy
300
You notice three open containers in the back of Mr. Roach's room: wood, water, and ammonia. Which one do you smell as you enter the room?
a. wood b. water c. ammonia d. none of the above
300
Substance R: Molecular attraction is much stronger than the force pulling them apart. Substance D: Kinetic energy is greater than the attractive forces between molecules. What state of matter is each substance in?
a. R - Solid; D - gas b. R - liquid; D - gas c. R - gas; D - plasma d. R - plasma; D - liquid
300
A can filled with air is heated forcing some air out of the can. The can is then capped and cooled. What happens to the can as it is cooled?
a. nothing b. the can is crushed from the increased pressure inside the can c. the can is crushed from the decreasing pressure inside the can d. cannot answer due to insufficient information
300
Sample R of Argon gas has a temperature of 400K. Sample B of Argon gas has a temperature of 1,000K. What is the ratio of the average kinetic energies of the atoms of R to B?
a. 4:25 b. 2:5 c. 5:2 d. 25:4
300
In a phase change diagram, when does the phase change occur?
a. insufficient information to answer the question b. when the lines are slanting up c. when the lines are slanting down d. when the lines are horizontal
400
A liquid substance is heated 10 degrees C above room temperature. Which statement correctly describes the substance's molecules after they were heated?
a. they have slower speeds b. they have the same speed c. they move with less kinetic energy d. they move with greater kinetic energy
400
Which correctly explains what happens when water converts to steam or when it converts to ice?
a. converting to ice, particles gain energy and motion b. converting to steam, particles gain energy and motion c. changing to ice, motion increases and particles become electrically charged d. changing to steam, motion increases and particles become electrically charged
400
As air molecules collide with the surface of a container, they create
a. density b. potential energy c. pressure d. mass
400
Why does a spiral of Aluminum foil twirl when held over a warm toaster?
a. pull of gravity b. magnetic field from the electric current c. heat transfer by conduction d. formation of convection currents
400
A mass of gas is enclosed in a vessel with a fixed volume. How would an increase of the thermal energy of the system affect the gas molecules?
a. The molecules would move to the top of the vessel. b. The distance between the molecules would increase. c. The average velocity of the molecules would increase. d. The molecules would strike the walls of the vessel less often.
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