Phases and Substances
PECs, Particles, Attraction and Repulsion
Molar Mass
Ideal Gases
100

Which of the following cannot be used as a differentiating property?

A) density

B) melting point

C) chemical reactivity

D) hardness

E) temperature




E) Temperature

Temperature is not unique to a substance. A substance could be at different temperatures depending on its environment. Also, different substances could have the same temperature

100

_______ of configuration and _____ energy are favored in PEC diagrams

Higher number of configurations and lower energy are favored in PEC diagrams

100

What is the molar mass of oxygen?

16


100

Estimate the volume of 1 mol of an ideal gas at 0 degrees celsius and 1 atm 

22.4L 

200

Boiling of a liquid occurs when its _________ equals the ____________

Boiling of a liquid occurs when its vapor pressure equals the atmospheric pressure 

200

When particles are experiencing attraction, ________ is greater when ______ between particles is increased.

When particles are experiencing attraction, potential energy is greater when the distance between particles is increased. 

200

How many particles are present in one mole of oxygen gas (O2)

6.022 x 1023 (Avogadro's number)

200

A gas in a 5 L container at 10 degrees celsius is at 1 atm. If the temperature in the container is raised to 20 degrees celsius and the volume is doubled, what is the final pressure?

Final pressure is 1 atm

300

We assume that each substance, no matter how simple or complex, has at least one ________________ that makes it unique

differentiating characteristic 

300

When two particles experience ____, a smaller distance between the two particles results in a greater potential energy

repulsion

300

Determine the molar mass of a substance with formula C5H12O

88.14

300

When temperature decreases, the average kinetic energy ______. Attractive forces between particles are then able to ______ them ______. 

When temperature decreases, the average kinetic energy decreases. Attractive forces between particles are then able to hold them together.
400

During a phase change kinetic energy ______ while potential energy ________

Kinetic energy stays the same while potential energy changes
400

Draw a graph showing the distribution of particles of 3 different gases with different masses at the same temperature. Label which gas has the lowest and highest mass.

Use fraction of particles on the y-axis and velocity on the x-axis 

Gas with lowest mass should have a bigger fraction of particles moving at higher velocities. Gas with highest mass should have a bigger fraction of particles moving at a slower velocity. 

400

How many moles of H2O are in 5 liters of water? 1L=1000mL and 1mL=1g of water. 

278 moles

400

Determine the volume of occupied by 2.34 grams of carbon dioxide gas at STP.

1.19 L 

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