Graham's Law of Effusion

Presentation

•

Chemistry

•

11th - 12th Grade

•

Practice Problem

•

Medium

•

NGSS

HS-PS1-7

Standards-aligned

Audrey Nebzydoski

Used 65+ times

FREE Resource

10 Slides • 8 Questions

Graham's Law of Effusion

Mrs. Nebzydoski

Diffusion vs Effusion

Diffusion is when gases move throughout a space to reach an equilibrium.

Effusion is a gas escaping through a small hole.

Size matters:

Small gas particles travel faster than large gas particles
Small molecules effuse faster thsn larger molecules

Multiple Choice

Which will travel faster: oxygen gas or helium gas?

O₂

Multiple Choice

Which travels faster? CO₂ or Ar?

CO₂

Equation:

The speed at which a gas effuses is dependent upon the size of the molecule.

Solving the equation:

We usual make gas B the BIGGER gas and gas A the smaller gas for calculations.

Example:

How much faster does hydrogen gas travel than neon gas?

Than answer is 3 x faster....

Multiple Choice

How much faster will He(g) travel than O₂(g)?

4 times faster

2.8 times faster

0.35 times faster

0.125 times faster

How to work out the last question...

Try this one on paper....

If an unknown gas travels 3 times faster than neon gas , what is the molar mass of the gas?

Multiple Choice

your answer to the problem you wrote down from the previous slide?

1.1 g/mol

2 g/mol

0.15 g/mol

0.45 g/mol

How to solve the last problem

Multiple Choice

Usuing Graham's Law: If you had 2 identical balloons filled with Nitrogen gas (N₂) and Helium gas (He), which balloon will deflate the fastest?

Helium balloon

nitrogen balloon

they will both deflate at the same rate

the balloons will both pop

Multiple Choice

What is the chemical formula for the white solid "cloud" made in the reaction you just saw?

ammonia

hydrochloric acid

ammonium chloride

Multiple Choice

Did the ammonium chloride cloud form closer to the NH₃ side or the HCl side of the tube?

NH₃

HCl

Open Ended

Using Graham's Law: Explain why the cloud of ammonium chloride formed closer to the ammonia side of the tube than the hydrochloric acid side of the tube.

Type response here

Graham's Law of Effusion

Mrs. Nebzydoski

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