Write out the three balanced chemical equations. Under each equation write out the equation words. Which of them are exothermic? Which are endothermic?
Write out the three balanced chemical equations. Under each equation write out the equation words. Which of them are exothermic? Which are endothermic?
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Question
Write out the three balanced chemical equations. Under each equation write out the equation words. Which of them are exothermic? Which are endothermic?
Transcribed Image Text:Hess's law is an application of the fact that enthalpy is a state
thermodynamic quantities that are path-independent. This m
unimportant. Hess's law is an application of the first law of t
nor destroyed in chemical processes. Application of the first
reaction by combining other chemical equations for which we
The reaction of magnesium with oxygen gas can be generated
(1) MgO(s) +2HC1(aq)
(2) Mg(s) + 2HC1(aq)
(3) H-(g) + 1/20:(g)
→MgCl(aq) + H,0(1)
→ MgCl(aq) + H(g)
→ H;O(1)
AH =
The enthalpy change for reaction 1 will be measured in Part 2 e
for reaction 2 will be performed in Part 3 of this experiment. T
By combining the three enthalpy changes we can calculate the e
magnesium, even though we did not measure it directly.
SAFETY PRECAUTIONS
Obtain and wear eye protection. The cap of the calorimeter shou
Gases will build up and cause pressure to rise.
Work in pairs.
Part 1: Citric Acid and Sodium Bicarbonate
1. Using a 100 mL graduated cylinder obtain about 40 mL of citric
to the nearest 0.1 mL. Record the volume in the Data Sheet. Pour
place the temperature probe into the solution.
2. Start the Logger Pro application. Open the folder Chemistry wi
Endo-Exothermic. Using the Experiment menu select Data Colle
500 seconds. Set the sample rate to 0.5 samples(sen
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