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Graham's Law

Authored by Lisa Thompson

Science

8th Grade

NGSS covered

Graham's Law
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15 questions

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1.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

The rate of effusion of water vapor is 0.391 and the rate of effusion of propane is 0.251 at the same temperature and pressure.  What is the molar mass of propane? (write the formula and show your work)

44.0 g/mol

6.63 g/mol

0.37 g/mol

28.2 g/mol

2.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Effusion and diffusion rates are inversely proportional to the square root of the molar mass of the gas.

True

False

3.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which of the following gases will effuse most slowly under the same physical conditions?
Don't forget to check for diatomics!

Hydrogen

Chlorine

Ammonia (NH3)

Bromine

4.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which will travel faster: oxygen gas or helium gas?

O2

He

5.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

An unknown gas diffuses 0.25 times as fast as He (4 g/mol). What is the molecular mass of the unknown gas?

128

64

32

16

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Effusion is

used to describe the combustibility of a gas.

ability of a gas to escape through a tiny opening

what occurs after diffusion.

the ability of a gas to mix with other gases.

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

why would O2 effuse faster than CO2 in the same room

because O2 has more energy

because CO2 has a greater molar mass

because oxygen has a higher temperature

they will effuse the same because the temperature is fixed

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