Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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Question
Chapter 1, Problem 104AE
(a)
Interpretation Introduction
Interpretation
The uncertainty in the final answers of the given mathematical operations and the number of significant figures in the final answers has to be found.
Concept introduction:
The measurement of specified components is one of the important stage in any laboratory analysis. Any error occurring in a measurement process can affect the accuracy of the result. Uncertainty is the range of values that is possible for a particular calculation. For example the measurement of length of a substance was reported to have the following values,
Significant figures are the numbers, which is contributing a particular value or meaning to the measurement. For example the number of significant figures in 0.12 is two.
(b)
Interpretation Introduction
Interpretation
The uncertainty in the final answers of the given mathematical operations and the number of significant figures in the final answers has to be found.
Concept introduction:
The measurement of specified components is one of the important stage in any laboratory analysis. Any error occurring in a measurement process can affect the accuracy of the result. Uncertainty is the range of values that is possible for a particular calculation. For example the measurement of length of a substance was reported to have the following values,
Significant figures are the numbers, which is contributing a particular value or meaning to the measurement. For example the number of significant figures in 0.12 is two.
(c)
Interpretation Introduction
Interpretation
The uncertainty in the final answers of the given mathematical operations and the number of significant figures in the final answers has to be found.
Concept introduction:
The measurement of specified components is one of the important stage in any laboratory analysis. Any error occurring in a measurement process can affect the accuracy of the result. Uncertainty is the range of values that is possible for a particular calculation. For example the measurement of length of a substance was reported to have the following values,
Significant figures are the numbers, which is contributing a particular value or meaning to the measurement. For example the number of significant figures in 0.12 is two.
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I am told that when determining the number of significant figures, if the decimal place is absent, then you start counting from the first nonzero number on the right side and continue counting to the left until you reach the last digit. However, if the decimal place is present, start counting the first nonzero number from the left and continue counting to the right until the final digit has been reached.
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A researcher would like to determine whether there is any relationship between students’ grades and where they choose to sit in the classroom. Specifically, the researcher suspects that the better students choose to sit in the front of the room. To test this hypothesis, the researcher asks her colleagues to help identify a sample of n = 100 students who all sit in the front row in at least one class. At the end of the semester, the grades are obtained for these students and the average grade point average is M = 3.25. For the same semester, the average grade point average for the entire college is μ = 2.95 with σ = 1.10. Use a two-tailed test with α = .01 to determine whether students who sit in the front of the classroom have significantly different grade point averages than other students.NOTICE that you are asked to use α = .01!
A) sig., p<.01
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C) sig., p>.01
D) N.S., p<.01
Find the difference between the value of x2 and the sum of x1 plus x3.; let x4 be equivalent to the sum of x1 and x3 and let x5 be the difference between x2 and x5. This calculation scheme is shown below. Make notes about any similarities or differences between the values in your notes. x4 = x1 + x3 x5 = x2 – x4
Data Analyis
This section will include all data collected during the lab.
Thermochemical Data
Tinitial (°C)
Tfinal (°C)
ΔT (°C)
moles NaOH
qreaction (kJ)
ΔHrxn
Reaction 1
25.0
30.3
+5.3
0.025
-1.11
-44.4
Reaction 2
25.0
37.0
+12.0
0.025
-2.51
-100.4
Reaction 3
25.0
31.7
+6.7
0.025
-1.40
-56.1
Reaction 1: NaOH(s) → Na+(aq) + OH-(aq) + x1 kJ
1g /39.977g/mol = 0.025 moles
Moles NaOH = 0.025
qsolution = (4.184 J/g °C) (50.0g) (30.3°C -25.0°C)
= -1108.76 J/ 1000
qreaction (kJ) = -1.11 kJ
ΔH = -1.11 kJ/ 0.025 moles
ΔHrxn = -44.4 kJ/mol…
Chapter 1 Solutions
Chemistry
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