Enthalpy change, Chemistry

Question: Does the number of steps in a reaction process affect the enthalpy change of the overall reaction?

Hypothesis:

To compare experimental data to functionality of Hess's Law.

Procedure:

Part A:

1. Write the reaction for the dissociation of solid sodium hydroxide in water.

2. Get a coffee cup calorimeter, tare the electronic scale, and weight the calorimeter. Record.

3. Add approximately 100.0mL of distilled water to the cup.

4. Re-weigh the cup to determine the volume of water. Record.

5. Obtain a small piece of aluminum foil, place it on the scale, and tare the scale.

6. Weigh out approximately 1.00g of NaOH pellets. (USE EXTREME CAUTION! Re-cap the bottle!) Record.

7. Measure the temperature (to TWO decimal places) of water in the cup. Record.

8. Add the pre-weighed NaOH pellets to the calorimeter with water, cap it, stir the contents, and measure the temperature (to TWO decimal places) every 15 seconds for 2 minutes (or more, as needed until temperature stops increasing). Record.

9. Clean up.

Part B:

1. Write the equation for reaction between aqueous sodium hydroxide and aqueous hydrochloric acid.

2. Using the designated graduated cylinders, obtain 50.0mL of each of 0.500M NaOH(aq) and0.500M HCl(aq). Record.

3. Measure the temperature (to TWO decimal places) of both solutions. Record.

4. Mix the two materials into a coffee cup calorimeter, cap it, stir the contents, and measure the temperature (to TWO decimal places) every 15 seconds for 2 minutes (or more, as needed until temperature stops increasing). Record.

5. Clean up.

Part C:

1. Write the equation for the reaction between solid sodium hydroxide and aqueous hydrochloric acid.

2. Get a coffee cup calorimeter, tare the electronic scale, and weight the calorimeter. Record.

Posted Date: 2/22/2013 12:30:15 AM | Location : United States







Related Discussions:- Enthalpy change, Assignment Help, Ask Question on Enthalpy change, Get Answer, Expert's Help, Enthalpy change Discussions

Write discussion on Enthalpy change
Your posts are moderated
Related Questions
Q. Explain the structure of Alkenes? Ans. Alkenes have the general formula C n H 2n . Therefore, for every n carbon atoms, there are 2n hydrogen atoms. Alkenes have C =

Solid propellants these types of propellants are mixtures of solid fuel and a solid oxidizer. These are further categorized into two sub-classes, (1) Composite propellants

Q. What is SI unit of energy? Ans. The SI unit of energy is called the joule. A joule is a pretty small mount of energy so often chemists will use the unit kJ =1 kilojoule



Aluminium metal is frequently used as a reducing agent for the extraction of metals such as chromium, manganese etc. Explain why? Ans) Aluminium is an highly electropositive metal



please read instruction carefully do not accept job if you are not able to do it i only accept high quality work

GFAAS is often necessary to add modifiers in order to increase the sensitivity of the techniques.Giving example explain the principles used in the selection of such modifiers,be ca