(855) 4-ESSAYS

Type a new keyword(s) and press Enter to search

Hess

            
            
             Background: There are many reactions for which direct measurement of the enthalpy reaction is difficult, the hydration of magnesium sulfate being such a reaction. In these cases it is often possible to determine the enthalpy of reaction by direct measurements on more accessible related systems and then applying Hess' Law.
             Aim: to determine the change in enthalpy for the hydration of magnesium sulfate using Hess' Law.
             Hypothesis: It looks like there are being more bonds formed than broken in this reaction, therefore, I think the change in enthalpy will be exothermic.
             Variables: .
             - Temperature of the surroundings (this should not effect our experiment because it will be carried out in a polystyrene cup).
             - Air pressure (will have no effect on our experiment as it should not change during the short time our experiment will take.).
             - Temperature of the water (there will be an error with the thermometer).
             - Mass of MgSO4 and MgSO4•7H2O (error on the electronic balance).
             - Specific Heat Capacity (we are using the specific heat capacity of water).
             - Volume of Water - this is the controlled variable, as we will use the same amount of water in each experiment.
             - Water may have impurities (but we will use distilled water to decrease the error here).
             Equipment:.
             .
             Distilled Water.
             Measuring Cylinder.
             Polystyrene cup with lid.
             Thermometer.
             MgSO4 .
             MgSO4•7H2O.
             Stopwatch.
             Spatula.
             Electronic Balance.
             Weighing Container.
             .
             Method: .
             1. Measure out, using a measuring cylinder, 100mLs of distilled water into a polystyrene cup, and record the temperature.
             2. Accurately weigh out about 7.5 grams of anhydrous magnesium sulfate.
             3. Add this to the water and record the temperature of the water every 20 seconds during the reaction.
             4. Record the maximum temperature reached.
             5. Repeat steps 1 -   4, but taking approximately 15.5 grams of hydrated magnesium sulfate.
             Explaining the method:.
             We want to find out the change in enthalpy for the following equation: .


Essays Related to Hess

1. Chemical Reactions: Hess

Calorimetry: Hess"s LawIntroduction: Hess's Law Germain Henri Hess (1802 - 1850) is important primarily for his thermo-chemical studies, which began in 1839. The contributions of Hess to heat can be summed up in what is called the law of Hess, which is an empirical law. ... Hess"s law enables you to manipulate the equations in such a way that they can be added together to get the total enthalpy. ... Well, if you remember Hess's Law, you are in luck. ... This is why Hess"s Law is so important....

  • Word Count: 885
  • Approx Pages: 4

2. Propaganda essay

In the speech, Hess states "Woe to the people that fails to honor its heroes! ... Hess is making the generalization that if you do not honor heroes, they will not exist. ... By stating this, Hess is almost proposing that Hitler is God. ... The only problem is that Hess offers no evidence to prove such a statement. ... Had the citizens of Germany been better listeners, they might have questioned Hess's ideas about Hitler, but Hess gave the people what they wanted- a heroic God-like leader that everyone believed in. ...

  • Word Count: 1139
  • Approx Pages: 5
  • Grade Level: High School

3. Withering Heights

Read "Withering Heights" for the first time, think that Hess and Cliff is really the devil's incarnation, he hates destroying two manors and two generations of persons privately for a own one: Purchase Withering Heights, insult Handle; Entice Lin Dun's younger sister, torment after marrying; He and Lin Dun's younger sister's Xiao Lin of child has been weak and sickly since the childhood earnestly, grow up under his despotic power, Selfish and cowardly; Catherine, and daughter of Dun Lin little Catherine originally artless and vivacious, marry little Lin become cold and de...

  • Word Count: 652
  • Approx Pages: 3
  • Grade Level: Undergraduate

4. Large Classes

In the context of teaching English to speakers of other languages there is no set definition of what constitutes a "large" class (Ur, 1996, Hayes 1997, Hess, 2001). ... Hess, (2001) and (Hayes, 1997) cite control management issues and the inability to allow for individual learning styles. Hess (2001) further states the difficulties of encouraging the quiet student and the enormity of responding to written work. ... Interestingly, multileveled classes are mentioned as both a problem and a benefit (Hess, 2001). ... Hess (2001) uses ball games to assist in learning student names. ...

  • Word Count: 2540
  • Approx Pages: 10
  • Grade Level: High School

5. Daddy

His friend, Professor Gregor Laemmle, who is a cunning yet odd homosexual, and a vicious, boneheaded nazi, named Jurgen Hess who is willing to kill anything that moves. ... Laemmle and Hess make attempts to capture Thomas in hopes of using him as bait to reach his mother, but Thomas engages Laemmle in a battle of brains running around all over the south of France. ... Due to Hess and his goons the rendezvous goes horribly wrong, and Maria is killed in her car when it was set ablaze by a multitude of bullets. ... Thomas, tired of being hunted, decided to kill both Laemmle and Hess with the hel...

  • Word Count: 842
  • Approx Pages: 3
  • Has Bibliography
  • Grade Level: High School

6. Plate Tectonics

In 1960, a professor from Princeton University, by the name of Harry Hess developed the new theory of seafloor spreading. ... When Harry Hess and Robert Dietz were investigating the features of the ocean floor and the continents they suggested the idea that new seafloor develops at mid-ocean ridges and then spreads outward. ...

  • Word Count: 656
  • Approx Pages: 3
  • Grade Level: High School

7. Healthy Age

The finding conclude this client to be highly functional according to the guidelines of Ebersole's "Learning and Growing in Later Life (Ebersole and Hess, 2001, p. 40) HEALTHY AGE FUNCTIONAL ASSESSMENT I. ... Cognitive Findings: During this portion of the assessment, the uses of "Advanced Activities of Daily Living (AADLs), which includes occupational, recreational, and leisure-time activities- (Ebersole and Hess, 2001, p. 269), are noted. ... A "MiniMental LLC Examination- (Ebersole and Hess, 2001, p. 275) was administered du...

  • Word Count: 1662
  • Approx Pages: 7
  • Grade Level: High School

8. Teacher Shortage

Lastly, the article simplifies this new process of changing teacher certification into a three-step program according to a man named Frederick Hess of the University of Virginia. ... Finally, I would like to comment on Frederick Hess" of the University of Virginia and his three-step process of changing teacher certification. ...

  • Word Count: 1209
  • Approx Pages: 5
  • Grade Level: High School

9. Insanity Defense And Concepts

Due to this, there are problems in exactly how to apply a medical theory to a legal matter (Wrobleski, Henry M. and Hess, Karen M. 2000) Opponents of the insanity defense charge that criminal responsibility is separate from mental illness and the two should not be equated. ... (Wrobleski, Henry M. and Hess, Karen M. 2000) The legal concepts of mental illness and insanity raise questions in a conflict between what are termed legalistic criminology and scientific criminology: mens rea (guilty mind) , punishment vs. treatment , responsibility , and prisons vs. hospitals. ... (Wrobleski, Henry ...

  • Word Count: 1114
  • Approx Pages: 4
  • Has Bibliography
  • Grade Level: High School

Got a writing question? Ask our professional writer!
Submit My Question