
(a)
Interpretation:
The value 0.00001258 L needs to be round off up to three significant figures.
Concept Introduction:
The following rules needs to be followed to determine the correct number of significant figures in a given number:
- All non-zero digits are significant.
- Trailing zeros after decimal are significant.
- All zeros in between two non-zero or significant figures are significant.
Rules for rounding off numbers are as follows:
- If the digit to be rounded off is followed by digit greater than 5, the number will be rounded up.
- If the digit to be rounded off is followed by digit zero or less than 5, the number will be rounded down.
- If the digit to be rounded off is followed by digit 5 and it is even, then it will remain the same, but if the digit is odd, it will be rounded up to get an even number.
For example: Rounding off number 38, the first digit is followed by digit 8 which is greater than 5 thus; the number will be rounded up to the nearest ten that is 40.
For example: Rounding off number 33, the first digit is followed by digit 3 which is less than 5 thus; the number will be rounded down to the nearest ten that is 30.
(b)
Interpretation:
The value
Concept Introduction:
The following rules needs to be followed to determine the number of significant figures:
- All non-zero digits are significant.
- Trailing zeros after decimal are significant.
- All zeros in between two non-zero or significant figures are significant.
Rules for rounding off numbers are as follows:
- If the digit to be rounded off is followed by digit greater than 5, the number will be rounded up.
- If the digit to be rounded off is followed by digit zero or less than 5, the number will be rounded down.
- If the digit to be rounded off is followed by digit 5 and it is even, then it will remain the same, but if the digit is odd, it will be rounded up to get an even number.
For example: Rounding off number 38, the first digit is followed by digit 8 which is greater than 5 thus; the number will be rounded up to the nearest ten that is 40.
For example: Rounding off number 33, the first digit is followed by digit 3 which is less than 5 thus; the number will be rounded down to the nearest ten that is 30.
(c)
Interpretation:
The value
Concept Introduction:
The following rules needs to be followed to determine the number of significant figures:
- All non-zero digits are significant.
- Trailing zeros after decimal are significant.
- All zeros in between two non-zero or significant figures are significant.
Rules for rounding off numbers are as follows:
- If the digit to be rounded off is followed by digit greater than 5, the number will be rounded up.
- If the digit to be rounded off is followed by digit zero or less than 5, the number will be rounded down.
- If the digit to be rounded off is followed by digit 5 and it is even, then it will remain the same, but if the digit is odd, it will be rounded up to get an even number.
For example: Rounding off number 38, the first digit is followed by digit 8 which is greater than 5 thus; the number will be rounded up to the nearest ten that is 40.
For example: Rounding off number 33, the first digit is followed by digit 3 which is less than 5 thus; the number will be rounded down to the nearest ten that is 30.
(d)
Interpretation:
The value
Concept Introduction:
The following rules needs to be followed to determine the number of significant figures:
- All non-zero digits are significant.
- Trailing zeros after decimal are significant.
- All zeros in between two non-zero or significant figures are significant.
Rules for rounding off numbers are as follows:
- If the digit to be rounded off is followed by digit greater than 5, the number will be rounded up.
- If the digit to be rounded off is followed by digit zero or less than 5, the number will be rounded down.
- If the digit to be rounded off is followed by digit 5 and it is even, then it will remain the same, but if the digit is odd, it will be rounded up to get an even number.
For example: Rounding off number 38, the first digit is followed by digit 8 which is greater than 5 thus; the number will be rounded up to the nearest ten that is 40.
For example: Rounding off number 33, the first digit is followed by digit 3 which is less than 5 thus; the number will be rounded down to the nearest ten that is 30.

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Chapter 2 Solutions
Basic Chemistry (5th Edition)
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