
Concept explainers
(a)
Interpretation:
The number of significant digits present in each of the numbers has to be given.
Concept Introduction:
Significant digits:
In a number, the digits which contribute to the precision of the number are said to be significant digits.
Rules for determination of significant digits in a number:
- All non-zero digits are significant.
- The zeros appearing between two non-zero digits are significant.
- The zeros before the non-zero numbers are not significant.
- Zeros after non-zero number without decimal are non significant.
- Zeros after non-zero number with decimal are significant.
- Zeros after the decimal point are significant.
- Any numbers with scientific notation are significant.
(b)
Interpretation:
The given numbers has to be rounded to three significant digits.
Concept Introduction:
Rounding off a number:
- The last digit retained is left unchanged if the following digit is less than five.
- The last digit retained is increased by one if the following digit is greater than five.
- If the last digit retained is followed by a single digit of five or by a five followed by zeros, then the last digit is increased by one if it is odd number and remains as same if it is even number.
(c)
Interpretation:
The calculations have to be done and the result has to be rounded to the proper number of significant digits.
Concept Introduction:
The sum of the significant digits has to be given in the lowest decimal present in the values.
The significant digit in multiplication and division has to be given as the quantity with the fewest significant figures.

Want to see the full answer?
Check out a sample textbook solution
Chapter 1 Solutions
Chemistry: The Molecular Science
- Indicate how to prepare a 10% sodium hydroxide (NaOH) solution to a slightly alkaline pH.arrow_forwardCH, CH CH₂ CH₂ Phytyl side chain 5. What is the expected order of elution of compounds A-D below from a chromatography column packed with silica gel, eluting with hexane/ethyl acetate? C D OHarrow_forwardPlease analze my gel electrophoresis column of the VRK1 kinase (MW: 39.71 kDa). Attached is the following image for the order of column wells and my gel.arrow_forward
- 2.0arrow_forwardWrite the electron configuration of an atom of the element highlighted in this outline of the Periodic Table: 1 23 4 5 6 7 He Ne Ar Kr Xe Rn Hint: you do not need to know the name or symbol of the highlighted element! ☐arrow_forwardCompare these chromatograms of three anti-psychotic drugs done by HPLC and SFC. Why is there the difference in separation time for SFC versus HPLC? Hint, use the Van Deemter plot as a guide in answering this question. Why, fundamentally, would you expect a faster separation for SFC than HPLC, in general?arrow_forward
- A certain inorganic cation has an electrophoretic mobility of 5.27 x 10-4 cm2s-1V-1. The same ion has a diffusion coefficient of 9.5 x 10-6cm2s-1. If this ion is separated from cations by CZE with a 75cm capillary, what is the expected plate count, N, at an applied voltage of 15.0kV? Under these separation conditions, the electroosmotic flow rate was 0.85mm s-1 toward the cathode. If the detector was 50.0cm from the injection end of the capillary, how long would it take in minutes for the analyte cation to reach the detector after the field was applied?arrow_forward2.arrow_forwardPlease solve for the following Electrochemistry that occursarrow_forward
- Commercial bleach contains either chlorine or oxygen as an active ingredient. A commercial oxygenated bleach is much safer to handle and less likely to ruin your clothes. It is possible to determine the amount of active ingredient in an oxygenated bleach product by performing a redox titration. The balance reaction for such a titration is: 6H+ +5H2O2 +2MnO4- à 5O2 + 2Mn2+ + 8H2O If you performed the following procedure: “First, dilute the Seventh Generation Non-Chlorine Bleach by pipetting 10 mL of bleach in a 100 mL volumetric flask and filling the flask to the mark with distilled water. Next, pipet 10 mL of the diluted bleach solution into a 250 mL Erlenmeyer flask and add 20 mL of 1.0 M H2SO4 to the flask. This solution should be titrated with 0.0100 M KMnO4 solution.” It took 18.47mL of the KMnO4 to reach the endpoint on average. What was the concentration of H2O2 in the original bleach solution in weight % assuming the density of bleach is 1g/mL?arrow_forward10.arrow_forwardProper care of pH electrodes: Why can you not store a pH electrode in distilled water? What must you instead store it in? Why?arrow_forward

