Lecture - Significant Figures Quiz

Nonzero integers always count as what in a number?

• Leading zeros

• Trailing zeros

• Significant figures

• Captive zeros

What are leading zeros?

• Zeros that count as significant figures

• Zeros between nonzero digits

• Zeros at the right end of the number

• Zeros that precede all the nonzero digits

How many significant figures does the number 1.008 have?

• Two

• Three

• Four

• Five

Trailing zeros are significant only if the number contains what?

• A nonzero digit

• A decimal point

• A leading zero

• A captive zero

How many significant figures does the number 100 have when written as 1.00 x 10^2?

• One

• Two

• Three

• Four

What are exact numbers in the context of significant figures?

• Numbers obtained using measuring devices

• Numbers that have a finite number of significant figures

• Numbers determined by counting or from definitions, assumed to have an infinite number of significant figures

• Numbers that are always less than 10

Which of the following is an example of an exact number?

• The mass of a sample measured with a scale

• The length of a rod measured with a ruler

• The number 2 in the formula for the circumference of a circle (2πr)

• The volume of a liquid measured with a graduated cylinder

According to the text, why does the statement "1 inch is defined as exactly 2.54 centimeters" not limit the number of significant figures when used in a calculation?

• Because it is a measured value with a margin of error

• Because it is a definition that provides an infinite number of significant figures

• Because it is a random value with no significance

• Because it is a variable that changes with each measurement

How many significant figures are in the measurement 0.0105 g of caffeine from a student's extraction procedure on tea?

• 2

• 3

• 4

• 5

How many significant figures are in the measurement 0.050080 g recorded by a chemist in an analysis?

• 4

• 5

• 6

• 7