Question 1

Which of the following numbers is correctly written in scientific notation?

Accepted Answer

$$4.5 	imes 10^1$

Question 2

A sample has a mass of 27.2 g and a volume of 22.5 mL. What is its density in $$\mathrm{g/mL}$$, reported to the correct number of significant figures?

Accepted Answer

$$1.21\ \mathrm{g/mL}$$

Question 3

Which measurement below contains the correct number of significant figures for a graduated cylinder marked every 0.1 mL?

Accepted Answer

$$2.94\ \mathrm{mL}$$

Question 4

How many significant figures are in the measurement $$0.00450$$?

Accepted Answer

3

Question 5

Which of the following is an exact number?

Accepted Answer

The number of pencils in a box: 10 pencils

Question 6

A car travels $$78.0\ \mathrm{km} on a $$trip. How many miles did the car travel? ($$1\ \mathrm{mi} = 1.609\ \mathrm{km})$$

Accepted Answer

$$48.5\ \mathrm{mi}$$

Question 7

Which statement about mass and weight is correct?

Accepted Answer

Mass is a measure of the amount of matter, while weight depends on gravity.

Question 8

A medication is prescribed at $$11.5\ \mathrm{mg/kg} of $$body weight. What is the dose in grams for a $$145.1\ \mathrm{lb}$$ patient? ($$1\ \mathrm{kg} = 2.205\ \mathrm{lb})$$

Accepted Answer

$$0.756\ \mathrm{g}$$

Question 9

Which SI prefix multiplier is most appropriate for expressing the length of a chemical bond, typically about $$120\ \mathrm{pm}$$?

Accepted Answer

pico ($$10^{-12})$$

Question 10

Convert $$2650\ \mathrm{cm}^2 to$$ $$\mathrm{m}^2$$ using the correct conversion factor and significant figures.

Accepted Answer

$$0.2659\ \mathrm{m}^2$$

Question 11

Which of the following conversion factors is correctly constructed from the equivalence $$1\ \mathrm{in.} = 2.54\ \mathrm{cm}$$?

Accepted Answer

$$\frac{2.54\ \mathrm{cm}}{1\ \mathrm{in.}}$$

Question 12

A student measures the temperature of a solution as $$103.3\ ^\circ\mathrm{C}. If $$the thermometer is marked every $$1\ ^\circ\mathrm{C}$$, how many significant figures should be reported?

Accepted Answer

3

Question 13

When multiplying $$2.02 	imes 89.667 	imes 0.10$$, to how many significant figures should the final answer be rounded?

Accepted Answer

Two

Question 14

Which rule applies when adding $$5.892 + 6.10$$?

Accepted Answer

Round to the least number of decimal places.

Question 15

A liquid has a density of $$1.32\ \mathrm{g/cm}^3. $$What volume in $$\mathrm{mL} is $$needed to obtain $$68.4\ \mathrm{g} of $$the liquid?

Accepted Answer

$$51.8\ \mathrm{mL}$$

Question 16

Which of the following is NOT a derived SI unit?

Accepted Answer

Meter ($$\mathrm{m})$$

Question 17

A solution map is most useful for which type of chemistry problem?

Accepted Answer

Unit conversion problems

Question 18

Which of the following statements about significant figures is correct?

Accepted Answer

Trailing zeros after a decimal point are significant.

Question 19

A block of titanium has a mass of $$90.0\ \mathrm{g}$$ and a density of $$4.50\ \mathrm{g/cm}^3. $$What is its volume in $$\mathrm{cm}^3$$?

Accepted Answer

$$20.0\ \mathrm{cm}^3$$

Measurement and Problem Solving in Chemistry: Scientific Notation and Significant Figures

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