Chemistry Lab Essay, Research Paper
Lab Report
Introduction:
The purpose of this lab was determining the molecular weight of an unknown solid organic compound by freezing point depression. In order to do so, one has to first, freeze cyclohxane, by putting it in ice cold water, and see what the constant temperature comes out as. Then, one has to freeze .4 grams of there unknown, and cyclohexane by doing the same process and also see what the constant temperature will come out as. After figuring out your constant temperature, on should then plug their numbers into the equations.
Procedure:
These equations were given in the lab procedures for experiment number ten Experiments for General Chemistry at Yavapai College
Pure Impure
temp time temp time
23.8 15 24.2 15
21.8 30 22.3 30
16.7 45 16.4 45
12.4 60 12.1 60
10.2 75 9.9 75
9 90 8.7 90
7.9 105 8 105
7.5 120 7.6 120
7 135 7.5 135
6.7 150 7.3 150
6.4 165 7.1 165
6.4 180 6.9 180
6.4 195 6.7 195
6.4 210 6.5 210
6.4 225 6.5 225
6.4 240 6.5 240
temp time temp time
25.5 15 19.7 15
22.7 30 16.5 30
15.7 45 11.5 45
10.8 60 8.4 60
7.9 75 6.5 75
6.1 90 5.4 90
5 105 4.2 105
4.2 120 3.5 120
3.1 135 3.1 135
2.8 150 2.8 150
2.7 165 2.6 165
2.6 180 2.5 180
2.5 195 2.5 195
2.2 210 2.4 210
2.2 225 2.4 225
2.2 240 2.4 240
Pure Substance Impure Substance
Results and Calculations:
Molality = moles of solute/Kilograms solvent Density = 0.77g/ml
D = Mass/volume
Volume = 25ml
(.77g/ml) = (m/25ml) 19.25/g (1kg/1000g) 4.3 = 20* ml *m
= 19.25g = .01925k M = .215
(.215M) = (.4012/ mw) / (.01925 kg)
= (.00414M) = (.4012/mw)
= (.4012) / (.00414M) = 96.908mw
Conclusion:
The results for this experiment turned out as the molecular weight being 96.9. The weight of unknown originally was 128; therefore the molecular weight that was calculated was only off by 31.1. The percent error of the whole experiment was 34.3%. The only thing that could have semi contaminated this experiment was the rust from the stirrer. Other than that, there is nothing else the experimenter can think of.
Другие работы по теме:
Hopes And Dreams Essay Research Paper Hopes
Hopes And Dreams Essay, Research Paper Hopes and Dreams Science has been the backbone of my life ever since my high school days in Malaysia. Although I studied many science subjects like Physics and Biology, I was especially fond of chemistry. My fondness of chemistry was attributed to my chemistry teacher Mr.
Dr Anthony D Johnson Essay Research Paper
Dr. Anthony D. Johnson Dr. Johnson was born in Brooklyn,New York. His father was a bus driver for the area and his mom worked at the local post office. Since he had no role
Education Today Essay Research Paper Education TodayEducation
Education Today Essay, Research Paper Education Today Education today isn?t quiet what I would like it to be; although it is improving if I was in power I think I would make a few changes. In high school there are certain classes that are mandatory for an individual to graduate history, chemistry and biology are a couple.
Harold Clayton Urey Essay Research Paper Jikesh
Harold Clayton Urey Essay, Research Paper Jikesh Patel 11/3/00 Block F Harold c. Urey Harold Clayton Urey was a scientist whose discovery of deuterium helped him win the Nobel Peace Prize for Chemistry in 1934. He also made fundamental contributions to the production of the atomic bomb through his development of the isotope separation processes for the Manhattan Project.
Supernova Essay Research Paper The titanic explosion
Supernova Essay, Research Paper The titanic explosion of a star is commonly known as a supernova. Supernova’s outbursts of energy are the largest explosions and events that occur in the universe. Essentially, they create the basic elements of life. Shock waves from the exploding star trigger the births of new stars and the formation of solar systems like our own.
A Vogadro Essay Research Paper A VogadroA
A Vogadro Essay, Research Paper A Vogadro A vogadro was born on June 9, 1776 in Turin, Italy. He began his career in 1796 by obtaining a doctorate in law and practicing as a lawyer for three years after. In 1800, he began to take private lessons in mathematics and physics and decided to make the natural sciences his profession.
A Vogadro Essay Research Paper A vogadro
A Vogadro Essay, Research Paper A vogadro was born on June 9, 1776 in Turin, Italy. He began his career in 1796 by obtaining a doctorate in law and practicing as a lawyer for three years after. In 1800, he began to take private lessons in mathematics and physics and decided to make the natural sciences his profession.
The Three Basic Laws Of Chemis Essay
, Research Paper John Dalton was born in 1766 and died in 1844. Around 1803 he developed the first atomic theory of matter. He was a meteorologist and was very important to study of chemistry. Dalton discovered the three basic laws of chemistry. The law of conservation of mass, The law of definite proportions, and The law of multiple proportions.
John Dalton Essay Research Paper John DaltonJohn
John Dalton Essay, Research Paper John Dalton John Dalton was a great help to modern day chemistry. He was born in 1766 in the small town of Eaglesfield, Cumbria, NW England in the UK. He was a chemist that stated an atomic theory of matter, which is now the theory of modern day chemistry. Besides his theories, he published the first major book of the studies of color blindness; which affected him.
Pierre Curie Essay Research Paper Born in
Pierre Curie Essay, Research Paper Born in 1859 in Paris, Pierre Curie was a French physicist who spent a great deal of his life dealing in the fields of chemistry and physics. During his lifetime, he was known for his work in radioactivity, magnetism, piezoelectric effect, and his work and studies with his wife Marie Curie in discovering new elements on the periodic table.
Brucie Essay Research Paper He was well
Brucie Essay, Research Paper He was well over six feet with dark brown skin, graying, balding hair. I would guess he weighed 240 pounds, most of the excess being carried in a potbelly. This was my high school chemistry teacher Mr. Bruce V. White.
Frankenstein Essay Research Paper Mary Shelley 192ppFrankenstein
Frankenstein Essay, Research Paper Mary Shelley 192pp. Frankenstein Copyright1957 Almat Publishing Pyramid Books The conflict in the story Frankenstein is self vs. another. Victor Frankenstein is a man interested in chemistry, who alters dead flesh therefore creating a superhuman being of rotted corpses.
Atoms Essay Research Paper The molecular structure
Atoms Essay, Research Paper The molecular structure hypothesis – that a molecule is a collection of atoms linked by a network of bonds – was forged in the crucible of nineteenth century experimental chemistry. It has continued to serve as the principal means of ordering and classifying the observations of chemistry.
Alfred Nobel Essay Research Paper The inventor
Alfred Nobel Essay, Research Paper The inventor of dynamite was a very important roll to take part in. The ultimate inventor of it was a mane named Alfred Nobel. Before dynamite, miners had to use nitrogen to blow holes in rock and other things. However it is too volatile and can explode incredibly easily. Alfred changed all this.
Changes In Life Essay Research Paper Today
Changes In Life Essay, Research Paper Today we live in a society that is always changing. This is because of technology. New technology allows us to work faster and better than before. Unfortunately, people have not learned to live together in peace. If I ruled the world, I would try to bring all people together.
Marie Curie Essay Research Paper Marie Curie
Marie Curie Essay, Research Paper Marie Curie is the most famous woman of physics. She has been recognized for her work with Nobel Prize awards in both physics (1903) and chemistry (1911). She got a late start with her education obtaining her license in physics in 1893 and the corresponding degree in mathematics in 1894.
Bignerds Essay Research Paper Why nuclear fusion
Bignerds Essay, Research Paper Why nuclear fusion is so cool……. For a fusion reaction to take place, the nuclei, which are positively charged, must have enough kinetic energy to overcome their electrostatic force of repulsion. This can occur either when one nucleus is accelerated to high energies by an accelerating device, or …
Some Reminders About The Periodic Table Essay
, Research Paper Thanks to Doc Brown of ChemHelp.Net for these great chemistry revision notes. Check out his site for more! The elements are laid out in order of Atomic Number Hydrogen, 1, H, does not readily fit into any group
Where Are They In The Periodic Table
? Essay, Research Paper Thanks to Doc Brown of ChemHelp.Net for these great chemistry revision notes. Check out his site for more! Selected Elements of The Periodic Table (name, symbol and atomic numbers 1-38 &
Physical Fitness Essay Research Paper Physical Fitness
Physical Fitness Essay, Research Paper Physical Fitness Essay When choosing what physical characteristic that I would fall under, it was really hard to choose just one that would fit me. During the day I am sort a nerd. I try to do my homework as much as possible and I also sometimes get my Chemistry class mad by being the only one who would turn in the homework; simultaneously reminding the teacher that that assignment was due.
Move The Exams Essay Research Paper There
Move The Exams Essay, Research Paper There are two types of college students. Ones who were sent to college with mom s and dad s money and the others who work their way through school. There is no doubt that the stress that coming with juggling work and school is higher than average college student. For this working student, there requires a lot of thought, planning and secluding a routine that will satisfy both school and work.
Chemist Essay Research Paper Becoming a chemist
Chemist Essay, Research Paper Becoming a chemist takes a lot of hard work and discipline. One very importan aspect of being a chemist is English, Comunication is of the utter most importance
Carl Pauling Essay Research Paper Carl PaulingCarl
Carl Pauling Essay, Research Paper Carl Pauling Carl Pauling was born Feb. 28, 1901 in Portland Oreg. He has made major contributions in structural chemistry and molecular biology. Linus Pauling became interested in biological molecules, and he preformed magnetic studies on oxygen-carrying hemoglobin molecules with C.
The Safety Inspector Essay Research Paper The
The Safety Inspector Essay, Research Paper The Safety Inspector Mr. Redos, I am an inspector for the OSHA. I have noticed the following safety objects missing in the room F 203, chemistry room. These are sprinklers,
Osmosis 2 Essay Research Paper Osmosis in
Osmosis 2 Essay, Research Paper Osmosis, in botany and chemistry, the flow of one constituent of a solution through a membrane while the other constituents are blocked and unable to pass through the membrane. Experimentation is necessary to determine which membranes permit selective flow, or osmosis, because not all membranes act in this way.
Organic Chemistry Essay Research Paper Organic compounds
Organic Chemistry Essay, Research Paper Organic compounds are all different but they all share a similar characteristic. To start all organic compounds have carbon in their formulas; this is the main characteristic all organic compounds share. Next, some organic compounds are made up with a single covalent bond.
Robert Bunsen Essay Research Paper Robert Wilhelm
Robert Bunsen Essay, Research Paper Robert Wilhelm Bunsen s name was famous for a a few discoveries in the field of chemistry. For example you might recognize Bunsen from the lab device, the Bunsen Burner . He also helped invent the spectroscope and discovered spectrum analysis. And at the beginning of his career, he discovered that iron oxide is an antidote for arsenic.
Biology Essay Research Paper Why is knowledge
Biology Essay, Research Paper Why is knowledge of chemistry important to biology? Maier, Scott Advanced biology 10/7/99 Biology is the study of all living things and chemistry is the study of chemicals and their interactions. So, how are they related?
The Chemistry Of Photography Essay Research Paper
Michael Shorrock The chemistry of Photography Summary: Joseph-Nicephore Niepce took he word?s first photographs in 1824. Many people don?t know that he was the person who invented photography; they think that a Frenchman named Daguerre was the inventor but he got the idea from Niepce. Jacqueline Belloni, a chemist at the University of Paris-South at Orsay, is doing research on ?holes? in halide ions.
