Unit 3 Review

Lessons 1-4
In these lessons we learned about weather, proportions, density and temperature scales. By learning terms like cold front, low pressure and jet stream we are now able to more easily understand weather and the things that cause it. We learned about the proportionality constant k, which allows us to use other formulas to find volume, pressure and temperature. Then we learned that density= mass/volume. Next we learned the melting and boiling points of the three most common temperature scales used: Farenheit, celcius and kelvin. A picture below describes this in more depth.

Lessons 5-7
We learned how to covert celcius to kelvin by using the equation K=C+273.  We also talked about how gas particles are in constant random motion. when the temperature increases the gas particles speed up. Then we learned that in Charles's Law, volume is proportional to temperature. When temperature increases volume does as well but density decreases. Next we learned about fronts. When cold air overtakes warm air it is a cold front. When warm air takes over cold air it is a warm front.

Lessons 8-10
Sublimation is the change from a solid to a gas. Next we learned that atmospheric pressure is air pressure that's always present on Earth as a result of air molecules hitting surfaces of objects on earth. At sea level and 25C there is 14.7lb/in2 of air pressure from the air around us. This is 1 atm. Next we talked about Boyle's law. Boyle's Law states that the pressure of a given amount of gas is inversely proportional to its volume if the temperature and amount of gas are not changed.

 

 

 

Lessons 11 and 12

In lesson 11 we learned that stated in Boyle's Law the pressure of a given amount of gas is directly proportional to temperature if the gas volume and amount of gas do not change. Temperature must be Kelvin.  We also learned the differences between rigid and flexible containers. Flexible Container: Changing temp or pressure to make the volume change. Charles' law applies when pressure is the constant. Boyle's law applies when temperature is the constant. Rigid Container: Changing the temperature or pressure. Volume is a constant. Applies to Gay-Lussac's law. Then we learned that gas pressure is the force of gas molecules hitting the walls of its container.

 

 

Lessons 13-16

The combined gas law is written as k=PV/T. Then we learned that clouds form when water vapor condenses and forms water droplets. Must have something to condense on. Clouds form when water vapor condenses and forms water droplets. Next we talked about air pressure, which can be determined by measuing the height of a liquid in a container. And finally we talked about moles.  A mole is a unit used to keep track of very large numbers.

1 mole = 602,200,000,000,000,000,000,000 We also learned about standard temperature and pressure (STP). 1 atm = 273 K and 1 mole = 22.4 L at atm. Equal volumes of gases have equal numbers of gas particles if temperature and pressure are the same.


 

Lessons 17 and 18

The ideal gas law has a constant R which is always equal to .082, the equation is pictured below. The equation can be rearranged to solve for any variables and n represents the number of moles. Then we talked about humidity, the amount of water vapor in the air. Relative humidity is the amount of water vapor in the air compared to the maximum amount of water vapor possible temperature. This is expressed in %.

 

 

 

Lesson 19

This lesson talked about hurricanes which are giant stroms that consist of heavy rains and intense high winds.  They form over areas where warm water evaporates into the air and are measured on a scale of 1-5 from least to most severe. The picture below decribes how storms turn into hurricanes.







 

 Practice Problems: