ATTENTION! I ACTUALLY PASSED THE LAB!

Over the weekend, I worked hard to understand how to set up the dimensional analysis for this lab. I started by writing down the things I knew how to convert then tried to connect point A to point B. It ended up being less confusing than I though, but it did take me a while to figure everything. I did a few test trials at home with different sized bags. They were all successful! I felt fairly confident going into the lab today but also a little nervous. Thankfully I was able to pass the lab and move on to studying for the test on Friday!

Airbag Lab

Today we got the rubric for the Airbag lab that we are going to do on Monday and I am very nervous about the lab. We were told that we have to write the procedure and all the possible conversion factors that would be used in order to figure out what amount of baking soda and vinegar are needed to run the experiment. We also were given no measurements! All we will recieve on Monday is the pressure and temperature of the room. I am very confused on how I am supposed to write a procedure and the stoichiometry without really knowing what the lab is or any data that we will use!

Below are two links that I think might help me with the calculations for the lab: Video 1 (shorter)
Video 2 (long)
 THESE LINKS ARE VERY HELPFUL!!!!!!

Avagadro's Law and Combined Gas Law

Avagadro's Law

Gas is at a constant pressure and temperature

volume is directly proportional to the number of moles

Equal volumes of gases at the same temperature and pressure have the same number of particles

http://wps.prenhall.com/wps/media/objects/4678/4790892/images/aabjvhsa.jpg

Charles Law!

So Far So Good

Temperature and Volume

Temperature and volume vary directly with each other

Moles and Pressure are help constant

All temperature must be written in Kelvin for Charles Law

Kelvin is set on an absolute scale

Absolute zero= there is no kinetic movement of molecules at all

Charles Law Equation

http://thescienceclassroom.org/wp-content/uploads/2013/04/Charless-Law.png

Conversion Temperature to Kelvin

http://images.tutorvista.com/cms/images/83/celsius-to-kelvin-formulae.png

First Day of Gas Laws

TODAY WE LEARNED ABOUT GASES!!!!!!!!! LAST UNIT! THE END IS NEAR!!!!!!!!!

Four Characteristic of Gases: 

Volume (V)= Liters(L)

Pressure(P)= 1 atm (1.015x10^5)

Temperature(T)= Kelvin(K)

Number of atoms

Highly compressible

No definite shape or volume

Homogeneous mixture

Collisions are elastic

Common Units of Pressure:

https://kaiserscience.files.wordpress.com/2015/09/common-units-of-gas-atmosphere-pressure.jpg

Four Factors that Determine the State of a Gas:

Pressure

Temperature

Volume

Amount (usually measured in moles)

http://reich-chemistry.wikispaces.com/file/view/combined.gif/34136171/148x70/combined.gif

Boyle's Law

tells us that the relationship between pressure and volume is an inverse relationship. It deals with two of the four factors that determine the state of a gas: pressure and volume. It holds true at a constant temperature.

Heat Capacity of a Metal Lab

Today we got to complete the metal lab! Because of time restraints, we could not do both copper and lead so we had to pick which one we wanted to try. Half of the class did copper and the other half did lead. My partner and I choose to do copper. During the experiment, we used a form of calorimetry to determine the specific heat of copper. By measuring the increase in temperature of the water in which we put the copper in, we calculated the specific heat of the metal. We set the energy gained to the negative energy lost to find the answer. The steps we followed today:

1. Places 100.mL of room temp. distilled water into a Styrofoam cup and recorded temp.
2. Find the mass of the test tube
3. Place metal in test tube about 1/3 of the way
4. Find the mass of the test tube with metal
5. Heat the metal up in a water bath to boiling. Let boil for 5 minutes then record the temperature of the water (the metal should be the same temp.)
6. Pour the metal into the water with the Styrofoam cup. Place probe in cup and stir 
7. Record the highest temperature reached by the water

Our Data:

• mass of test tube- 15.9355
• mass of test tube and metal- 54.9484
• initial temperature of metal- 100.1 oC
• initial temperature of H20- 23.4 oC
• final temperature of metal and H20- 27.5 oC

 Using this data we were able to find the specif heat of copper!

Overview or explanation of lab
How to calculate specific heat

First Lecture

Calculate Heat:

http://1048believe.com/wp-admin/js/specific-heat-capacity-formula-physics-i0.jpg

We learned about heat as a form of energy change. Heat occurs when bonds are formed, not when bonds are broken in chemical reactions. Exothermic- when energy leaves a system. Endothermic- when energy enters a system. Endothermic vs Exothermic
                                                        
Measuring Energy Changes

https://dr282zn36sxxg.cloudfront.net/datastreams/f-d%3Adf0a2687d885c997ec852a60b09181c51b0a234ada913
6e0288d4e8c%2BIMAGE_THUMB_POSTCARD%2BIMAGE_THUMB_POSTCARD.1

Measuring Energy Changes: converting Calories to calories and reverese

http://www.sartep.com/chem/images/calorieconvert.gif

 

Types of Energy

• Kinetic Energy- energy of motion
• Radiant Energy- energy from the sun or solar energy
• Thermal Energy- energy associated with the random motion of atoms and molecules 
• Chemical Energy- energy stored within the structural units of chemical substances
• Potential Energy- energy stored or energy of position