Densisty And Pressure Of Gas Flashcards
Give me the definition of density
It’s how much mass a substance has for the volume it’s occupying. So basically mass:volume.
How do we calculate the density of an object/substance?
We divide the mass of the object/substance by its volume
Give the units for mass, for volume and for density
Mass: g, kg
Volume: mm3 or cm3
Density: g/cm3 or kg/m3
If we increase the density of an object how will it feel in your hands?
The more dense something is, the heavier the object/substance feels for its size.
A small cube of aluminium is placed on the table. Beside it is a cube twice it’s volume and made of aluminium. Which one is denser?
The mass and volume doesn’t matter in this case, because if an object of same material is compared in density, you wouldn’t find any difference between the two as the density is the same. So the smaller aluminium block has the same density as the bigger aluminium block.
Why would a gas have a lighter density compared to a solid or a liquid?
Because density is about mass and volume, so compared to gas, liquids and solids would weigh more and would have to be contained in a bigger volume container. Although, if you did for example keep the same volume, solids and liquids would still have a higher density because of 1. Weight and 2. More particles are needed to make up solids and liquids than gases
Why would aluminium have a lower density compared to gold when their atoms are the same size?
This is probably because either the mass of the particles are different or the amount of particles that have to form together to make that material is different. Just because their atom size is the same, doesn’t mean that every other characteristic is the same
Define gas pressure
Pressure is how much force is exerted over an area. The greater the pressure, the greater the force exerted over the same area. And gas pressure is basically that definition but the gas is exerting the force
How is gas pressure formed?
Gas particles move very quickly in all kinds of directions so they won’t get far before a collision happens. It will happen either with other gas particles or the wall of the container. Gas pressure is formed when gas hits the wall of the container.
There are three factor that influence the increase in gas pressure: what are they?
Gas pressure increases with a rise in temperature, it increases with the number of gas particles, and changes depending on the volume the gas occupies
How will a higher number of gas particles increase gas particles?
Higher amount of gas particles means a higher number of gas particles can collide into the container wall. Gas pressure will increase as gas collides with the wall more often
How does the volume of the container a gas occupies change the pressure of gas?
An increase of volume of the container means that gas particles have more room to move about, so collisions with the wall will happen less frequently. This is a bad things because gas pressure decreases the more room they’re given to move around. The opposite it also just as true. The smaller the volume of the container, the bigger gas pressure would continue to increase
How does increasing temperature increase gas pressure?
Increase in temperature gives the gas particles more energy so they move around quicker and more often: because of this, the gas will collide into walls of the container frequently so gas pressure increases
What will happen if gas pressure gets too high?
If you aren’t careful, gas pressure gets so great that it becomes too much for the container to handle: so it’ll burst. And if you heat the container too much, the container’ll explode
