Concept explainers
(a)
Interpretation:
The number 1.2735 should be rounded off to two significant figures.
Concept Introduction:
Significant figures are used to express the degree of accuracy of an answer. The rules for identifying significant figures are as follows:
- Non-zero digits are considered as significant figures. (1 to 9)
- Zeros between non-zero digits are considered as significant figures. (for example, 2008 has four significant figures.)
- Zeros that are left to the decimal are not considered as significant figures. (for example, 0000.28 has two significant figures.)
- On the right side of the decimal place, zeros between decimal and non-zero digits are not considered as significant figures. (for example, 0.0028 has two significant figures.)
- On the right side of the decimal place, zeros after the non-zero digits are considered as significant figures. (0.28000 has five significant figures.)
The rules for rounding off numbers are as follows:
- If the figure after the decimal is less than 5, then the digit remains unchanged.
- If the figure after the decimal is greater than 5 or equal to 5, then 1 is added to the tenths place.
- If the figure after the decimal is even, then the digit remains unchanged.
- If the figure after the decimal is odd, then 1 is added to the tenths place.
(b)
Interpretation:
The number 0.00253622 should be rounded off to two significant figures.
Concept Introduction:
Significant figures are used to express the degree of accuracy of an answer. The rules for identifying significant figures are as follows:
- Non-zero digits are considered as significant figures. (1 to 9)
- Zeros between non-zero digits are considered as significant figures. (for example, 2008 has four significant figures.)
- Zeros that are left to the decimal are not considered as significant figures. (for example, 0000.28 has two significant figures.)
- On the right side of the decimal place, zeros between decimal and non-zero digits are not considered as significant figures. (for example, 0.0028 has two significant figures.)
- On the right side of the decimal place, zeros after the non-zero digits are considered as significant figures. (0.28000 has five significant figures.)
The rules for rounding off numbers are as follows:
- If the figure after the decimal is less than 5, then the digit remains unchanged.
- If the figure after the decimal is greater than 5 or equal to 5, then 1 is added to the tenths place.
- If the figure after the decimal is even, then the digit remains unchanged.
- If the figure after the decimal is odd, then 1 is added to the tenths place.
(c)
Interpretation:
The number 3,836.9 should be rounded off to two significant figures.
Concept Introduction:
Significant figures are used to express the degree of accuracy of an answer. The rules for identifying significant figures are as follows:
- Non-zero digits are considered as significant figures. (1 to 9)
- Zeros between non-zero digits are considered as significant figures. (for example, 2008 has four significant figures.)
- Zeros that are left to the decimal are not considered as significant figures. (for example, 0000.28 has two significant figures.)
- On the right side of the decimal place, zeros between decimal and non-zero digits are not considered as significant figures. (for example, 0.0028 has two significant figures.)
- On the right side of the decimal place, zeros after the non-zero digits are considered as significant figures. (0.28000 has five significant figures.)
The rules for rounding off numbers are as follows:
- If the figure after the decimal is less than 5, then the digit remains unchanged.
- If the figure after the decimal is greater than 5 or equal to 5, then 1 is added to the tenths place.
- If the figure after the decimal is even, then the digit remains unchanged.
- If the figure after the decimal is odd, then 1 is added to the tenths place.

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Chapter 1 Solutions
ALEKS 360 ACCESS CARD F/GEN. ORG.CHEM
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- Curved arrows are used to illustrate the flow of electrons. Using the provided starting and product structures, draw the curved electron-pushing arrows for the following reaction or mechanistic step(s). Be sure to account for all bond-breaking and bond-making steps. I I I H Select to Add Arrows HCI, CH3CH2OHarrow_forwardCurved arrows are used to illustrate the flow of electrons. Use the reaction conditions provided and the follow the arrows to draw the intermediate and product in this reaction or mechanistic step(s).arrow_forwardCurved arrows are used to illustrate the flow of electrons. Use the reaction conditions provided and follow the curved arrows to draw the intermediates and product of the following reaction or mechanistic step(s).arrow_forward
- Curved arrows are used to illustrate the flow of electrons. Use the reaction conditions provided and follow the arrows to draw the intermediate and the product in this reaction or mechanistic step(s).arrow_forwardLook at the following pairs of structures carefully to identify them as representing a) completely different compounds, b) compounds that are structural isomers of each other, c) compounds that are geometric isomers of each other, d) conformers of the same compound (part of structure rotated around a single bond) or e) the same structure.arrow_forwardGiven 10.0 g of NaOH, what volume of a 0.100 M solution of H2SO4 would be required to exactly react all the NaOH?arrow_forward
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