e-Activity: Significant Figures Practice I

Significant Figures refer to the number of important _____ digits from zero(0) to nine(9) in the coefficient of an expression that conveys an accurate measurement, length, volume or mass.

• single

• real

• irrational

• variable

When rounding a quantity with no visible decimal point, to a place value(ie. nearest whole number), in significant figures, replace the rounded digits with_____.

To count the number of significant figures in a quantity, with no visible decimal point, start counting from the first digit _____.

• on the right

• on the left

• in the middle

• that varies depending on the number

All _____ digits are always significant figures.

Any zero(0) placed in between two(2) significant figures is considered a(n) _____.

• significant figure

• irrational number

• mixed number

• useless quantity

If zeros are placed both on the right side of a decimal point and left of a non-zero digit, they _____.

• are considered sometimes in the value of the quantity

• are significant figures

• may not be considered in the value of the quantity

• are not significant figures

Zeros placed on the right side of the last non-zero digit after the decimal point _____.

• are significant figures

• may sometimes be considered as significant figures

• are not significant figures

The measurement 1000 mL has ___ significant figure(s).

Zeros that are placed on the right side of the last non-zero digit _____ when they come from a measurement.

• are not significant figures

• may sometimes be significant figures

• are significant figures

How many significant figures are represented in the measurement

4000. torr? There are _____ significant figures in the measurement.

• 1

• 3

• 4

• 2