Class notes
Unit 4 assignment
- Course
- Institution
Written with TVO ILC
[Show more]
Seller
Follow
studystar9touni
Content preview
Overall expectation 1:1) Compare a solid and a gas with respect to the arrangement of their molecules. Use
this comparison to explain how solids exert pressure and how gasses exert pressure.
Solids Gasses
Molecules of solids are tightly packed Molecules of gasses are free.
together.
Energy in solids travel very fast because of Energy in gasses travel very slow because the
the particles being packed together. particles are free and take time to interact with
other particles.
The molecules of solids are neatly organized Molecules of gasses are not organized and
because the molecules of solids are held can’t be set together because the molecules
tightly together. are free.
Describe condensation (the change from gas to liquid) in terms of the kinetic molecular theory (KMT). Heat is
needed to excite particles of gasses and set them free so as heat is removed from the gas, the molecules of gas
start to move more slowly causing the intermolecular forces to be strong enough to pull the molecules together
to form droplets of liquid which eventually collect and form a lot of liquid. Explain, using the KMT, why a gas
is compressible and a liquid is not. According to the KMT the molecules of gas are free and far apart from each
other so when we try to compress the molecules they will be forced to be close to each other. According to the
KMT, the molecules of liquid are already close to each other so when we try to compress more it will not be
possible.
2) Driving a car causes the tires to get hot from friction. If you want to check to see if your tires
need air, the service manual of your car warns you against checking the tire pressure when the
tire is hot. Explain why, using your understanding of KMT. Heat is needed to excite the
molecules of gas and spread in the tire, this causes a lot of pressure to build up in the tire and
when we try to check the tire when it is hot there will be a higher inaccurate reading.
3) Explain how and why the number of moles of gas affects the volume of that gas, assuming
that the container volume can change. Is the relationship between number of moles and volume
direct or indirect? The number of moles affect the volume of the gas because as mentioned in
Avogadro’s law “the volume of a gas changes if the number of moles of the gas change when the
pressure and the temperature are about the same. The relationship is direct.
4) Explain how the molar volume of a gas would change as the temperature increases. As the
temperature of the gas increases, the molecules of the gas have more energy and start to move
faster. As a result, the molecules strike the surface of the container with more force. If the
container expands, the volume increases.
Overall expectation 2:
1) A steel container of compressed gas with an initial pressure of 369 kPa is heated from
15.0°C to 42.5°C because of storage in a sunny area. Calculate the new pressure in the container.
Remember that temperature needs to be in Kelvin when working with the gas laws!
P₁ = 369 kPa, T₁ = 15.0℃ = 15.0 + 273 = 288 K, P₂ = ?, T₂ = 42.5℃ = 42.5 + 273 = 315.5 K
𝑃1𝑇2 (369 𝑘𝑃𝑎)(315.5 𝐾)
P₂ = 𝑇1
= (288𝐾)
= 404 kPa
2
Therefore, the new pressure of the gas is 4.04✕10 kPa.
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller studystar9touni. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $6.28. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
67474 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now