Sig. Figs. and Rules Flashcards
True or False - The bold digits in the following folowing number are significant: 1.0789
True
True or False - The bold digits in the following folowing number are significant: 1.0700
True
Sig Figs were created to reflect the precision of an instrument
For example, a mass balance weighs to 0.0000 digits. Because that balance is precise up to that fourth decimal point, we would include it when we report the mass of an object or substance. Therefore, zeros after a decimal point that trail a nonzero digit are always significant. For example: the zeros in 0.0000099 are not significant, however, these underlined zeros are significant 0.009900
True or False - The bold digits in the following folowing number are significant: 1.070078
True
Zeros that are in between two non zero digits are always significant
True or False - The bold digits in the following folowing number are significant: 0.0001
False
Leadning zeros are not significant
Becuase the digit 1 is in the ten-thousandths place, this number alone will indicate the precision of an instrument, the leading zeros are not significant because they do nothing to indicate the precision of a hypothetical measurement.
True or False - The bold digits in the following folowing number are significant: 900000
False
Trailing zeros are not significant unless there is a decimal point
i.e. the zeros of 9000 are not significant but adding a decimal: 9000. makes all the zeros significant
True or False - The bold digits in the following folowing number are significant: 1.00890
True
Remember, zeros between digits are significant
True or False - The bold digits in the following folowing number are significant: 1.008900
True
Trailing zeros after a decimal are significant
What is the final answer for the following calculation? 2.1+2.0000000001
Remember your Sig Fig Rules
4.1
When adding or subtracting, use the number with the least decimal places
For this question, we limit our Sig Figs to the tenths (0.1) place because of 2.1
What is the final answer for the following calculation?
4-2.1
Remember your Sig Fig Rules
2
When adding or subtracting, use the number with the least decimal places
For this question, we limit our Sif Figs in the final answer to the nearest whole number because the number 4 limits our final answer to whole intergers in the ones place.
What is the final answer for the following calculation?
75.00000/25.0
Remember your Sig FIg Rules
3.00
For division & multiplication, we use the number with least Sig Figs
For this question, 25.0 has only three Sig Figs, so our final answer must have three Sig Figs as well.
What is the final answer for the following calculation?
(3.00000)(25.0)=?
75.0
For division & multiplication, we use the number with least Sig Figs
25.0 is again our limiting number, having only three Sig Figs. Therefore, our final answer must also have three Sig FIgs.