Question 1

A student determined the mass of a sample contained in a beaker by subtracting the mass of the beaker alone ($$73.8 \ \mathrm{g}) $$from the mass of the beaker containing the sample ($$75.652 \ \mathrm{g}). $$How many significant figures should be reported for the mass of the sample?

Accepted Answer

2 significant figures

Question 2

Which of the following calculations is performed correctly according to the rules for significant figures? $$12.32 - 12.22 \div 3.97$$

Accepted Answer

$$0.025$$

Question 3

Given the calculation $$98.00725084 + 2.8053281$$, how many significant figures should the answer have?

Accepted Answer

2 decimal places

Question 4

A calculation yields $$1.952447552 \div 1.485103868 = 1.314. If $$the numbers have 8 and 9 significant figures respectively, how many significant figures should the answer have?

Accepted Answer

4 significant figures

Question 5

Which of the following is the correct result for $$2.3357 	imes 10^6$ + 6.92 	imes 10^5$ + 3.0223 	imes 10^4$ expressed with the proper number of significant figures?

Accepted Answer

$$3.030 	imes 10^6$

Question 6

Convert $$0.0921 \ \mathrm{nm} to$$ $$\mathrm{pm}.$$

Accepted Answer

$$92.1 \ \mathrm{pm}$$

Question 7

A healthy individual has a blood glucose concentration reported as $$122 \ \mathrm{mg/dL}. $$Convert that to units of $$\mathrm{g/L}.$$

Accepted Answer

$$1.22 \ \mathrm{g/L}$$

Question 8

A small hole in the wing of the space shuttle requires a $$27.2 \ \mathrm{cm}^2$$ patch. What is the patch's area in square inches ($$\mathrm{in}^2$$)? ($$1 \ \mathrm{in} = 2.54 \ \mathrm{cm})$$

Accepted Answer

$$4.22 \ \mathrm{in}^2$$

Question 9

Pure gold has a density of $$18.9 \ \mathrm{g/cm}^3. $$Express this density in units of $$\mathrm{lb/ft}^3$$. ($$1 \ \mathrm{lb} = 453.6 \ \mathrm{g}$$, $$1 \ \mathrm{ft}^3 = 2.54^3$ 	imes 10^3$ \ \mathrm{cm}^3)$$

Accepted Answer

$$1181 \ \mathrm{lb/ft}^3$$

Question 10

Which of the following best describes the rule for determining the number of significant figures in the result of a subtraction operation?

Accepted Answer

The result should have the same number of decimal places as the measurement with the fewest decimal places.

Question 11

If you multiply $$0.088217 	imes 4.72$$, how many significant figures should the answer have?

Accepted Answer

3 significant figures

Question 12

A scientist measures the mass of a sample as $$1.852 \ \mathrm{g}$$ and the volume as $$0.025 \ \mathrm{L}. $$What is the density in $$\mathrm{g/L}$$, reported with the correct number of significant figures?

Accepted Answer

$$74.1 \ \mathrm{g/L}$$

Question 13

Which of the following conversions is correct for $$0.001317 \ \mathrm{kg} to$$ $$\mathrm{g}$$?

Accepted Answer

$$1.317 \ \mathrm{g}$$

Question 14

A solution contains $$0.00006000 \ \mathrm{mol} of $$solute in $$0.001317 \ \mathrm{L} of $$solution. What is the molarity ($$\mathrm{mol/L}) of $$the solution?

Accepted Answer

$$0.0456 \ \mathrm{mol/L}$$

Question 15

Which of the following is the correct scientific notation for $$0.00001871$$?

Accepted Answer

$$1.871 	imes 10$$^{-5}$$

Question 16

A sample has a mass of $$1471.00 \ \mathrm{g}$$ and a volume of $$808.0 \ \mathrm{cm}^3. $$What is its density in $$\mathrm{g/cm}^3$$ with the correct number of significant figures?

Accepted Answer

$$1.820 \ \mathrm{g/cm}^3$$

Question 17

Which of the following is the correct conversion factor to use when converting $$\mathrm{cm}^2 to$$ $$\mathrm{in}^2$$?

Accepted Answer

$$1 \ \mathrm{in}^2 = 6.4516 \ \mathrm{cm}^2$$

Question 18

A student records a measurement as $$0.0588 \ \mathrm{mol}$$, but the correct value is $$0.061 \ \mathrm{mol}. $$What is the percent error?

Accepted Answer

$$3.6\%$$

Question 19

Which of the following best describes the difference between accuracy and precision?

Accepted Answer

Accuracy refers to how close a measurement is to the true value, while precision refers to how close repeated measurements are to each other.

Significant Figures, Unit Conversions, and Scientific Calculations in General Chemistry 2.0

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