Expected number of signals (enter a numerical value): 4 eTextbook and Media Hint The number of signals in a 13C NMR spectrum represents the number of carbon atoms in different electronic environment (not interchangeable by symmetry) and the location of each signal is dependent on shielding and deshielding effects as in ¹H NMR. Incorrect. Indicate the number of signals expected in each region. 10-80 ppm 3 V 100-160 ppm 165-185 ppm 185-220 ppm 2 1 V Assistance Used 0

Expected number of signals (enter a numerical value): 4 eTextbook and Media Hint The number of signals in a 13C NMR spectrum represents the number of carbon atoms in different electronic environment (not interchangeable by symmetry) and the location of each signal is dependent on shielding and deshielding effects as in ¹H NMR. Incorrect. Indicate the number of signals expected in each region. 10-80 ppm 3 V 100-160 ppm 165-185 ppm 185-220 ppm 2 1 V Assistance Used 0

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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a. b. A student records the following data in the laboratory when determining the percentage of water in an unknown hydrate. Mass of container Mass of container and hydrate Mass of container and contents after: Pirst heating 47.952 % 49.837 % 49.500 % Second heating Third heating What is the percentage of water in this student's unknown? Based on the values obtained in the three heating's above, do you think the student should have confidence in his results? Why? What do you think he should do to be more confident in his result? 48.918 g 48.811 g
Which of the following is a correct way of measuring the Michaelis constant KM? a. Seconds b. Molecules/second c. Microliters d. Micromolar
23. Separate the given list of substances in to KCI, Cl2, NazSO4, Mg, C2H4O2, O2 Elements Compounds 24. Read the description about an experiment conducted and identify the following parts of scientific method. (30 pts) A farmer wanted to investigate whether a bamboo palm plant grow better inside or outside. His initial thought was that there will be no difference between the growth in indoor or outdoor. He decided to plant ten plants in identical pots using same type and same amount of soil. Then he placed five of them in outdoor location and the other five in an indoor location. The outdoor plants were receiving same amount of sunlight and both indoor and outdoor plants were given same amount of water. Each day for three weeks the plant growth was observed and measured by recording the size of each plant. It was observed that the indoor plants had grown more in size than the outdoor plants. Question of Interest: Hypothesis:
6. 1.23 x 104 is equal to A. 0.0000123 B. 0.000123 C. 1.230000 D. 123000 E. 1230000
The percent yield of iron in 1.342 in 1 342 g of ore samip and a relative error of -3.0 % is: a. 33.3% b. 74.5% c. 12.4% d. 62.4% e. 24.8% كلية العلوم ore sample, if the method has an absolute error of -0.005 g
28-31. Supply the missing value. n 1.55 1.65 1.70 1.80 ??? 1.62 Conc. 10% 15% 25% 35% 22% ??? 28-29.a. 1.66 c. 1.70b. 1.68 d. 1.72 30-31.a. 14.24 c. 16.24b. 15.24 d.17.24
If the balance reading was taken as 25.0025, then it should be reported as a. 25.0025 + 0.0001 m • b. 25.0025 t 0.0001 g c. 25.0025 0.0010 g • d. 25.0025 t 0.1000 g • e. 25.0025 + 0.0100 g
A student sets up the following equation to convert a measurement.(The ?stands for a number the student is going to calculate.)Fill in the missing part of this equation. Note: your answer should be in the form of one or more fractions multiplied together.
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What is the specific gravity of a substance that displaces 1.2 mL and has a mass of 5.021 Select one: O a. 4.2 b. 4.2 g/ mL С. 4.184 O d. 4.184 g/ml Oe. 4.18
Which of the following is true regarding calibration curve? O a. Most calibration curves show positive or negative deviations after certain value of concentration. O b. They are plots between response and concentration. O C. A and B are correct. O d. A andB are not correct.
Example 2 The decimal 251.737 is read "two hundred fifty-one and seven hundred thirty-seven thousandths." ( a. Write in words the weight of potassium in a 150-pound body. (3 b. Write in words the weight of the amount of copper in a 150-pound body. c. Which element would have a weight of six hundred-thousandths of a pound? a. Write the number 9,467.00624 in words. b. Write the number 35,454,666.007 in words. c. Write the following number using decimal notation: four million sixty-four and seventy-two ten-thousandths. d. Write the following number using decimal notation: seven and forty-three thousand fifty-two millionths. Converting Decimals to Fractions Note that each of the decimals you have encountered thus far in this activity end after a few digits. Decimals such as these are referred to as terminating decimals. When a terminating decimal is written as a fraction or mixed number, the denominator corresponds to the place value of the rightmost digit in the decimal. This leads to the…