Question 1

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

Accepted Answer

$$1.245 	imes 10$$^{7}$$

Question 2

How many significant figures are in the number $$0.00013$$?

Accepted Answer

2

Question 3

Calculate $$(12.0450 + 9.47)$$ and express the answer with the correct number of significant figures.

Accepted Answer

$$21.52$$

Question 4

A laboratory measurement yields $$0.0531 g $$divided by $$0.744 mL. $$What is the result, reported with the correct number of significant figures?

Accepted Answer

$$7.14 	imes 10$$^{-2}$$

Question 5

Which of the following represents the heaviest mass?

Accepted Answer

1 Mg

Question 6

What is the correct SI prefix for the multiplier $$1000$$?

Accepted Answer

none of the above

Question 7

The standard SI unit for temperature is:

Accepted Answer

Kelvin

Question 8

Convert $$8.2 	imes 10$$^{-2}$$ L to mL.

Accepted Answer

$$82 mL$$

Question 9

A sample of an unknown metal has a mass of $$35.4 g $$and a volume of $$3.11 cm$^3. $$What is its density in g/cm$$^3$$?

Accepted Answer

$$11.4 g/cm$^3$$

Question 10

Glycerol has a mass of $$3.15 	imes 10$$^{3}$$ g and a volume of 2.50$ L. What is its density in g/cm^3$?

Accepted Answer

$$1.26 g/cm$^3$$

Question 11

Acetone has a density of $$0.7857 g/cm$^3. $$What is the mass in grams of $$17.53 mL of $$acetone?

Accepted Answer

$$13.77 g$$

Question 12

How many microliters are in $$41.0 mL$$?

Accepted Answer

$$4.10 	imes 10$$^{4}$$

Question 13

A room measures $$10.0 ft$$ $$	imes$$ $$11.0 ft$$ $$	imes$$ $$8.00 ft. $$What is the volume in liters? (Given: $$1 ft$$ $$= 12 in$$., $$1 in$$. $$= 2.54 cm$$, $$1 mL$$ $$= 1 cm$^3$$, $$1 mL$$ $$= 1 	imes 10$$^{-3}$$ L)

Accepted Answer

$$2.49 	imes 10$$^{4}$$ L

Question 14

Convert $$2.5 	imes 10$$^{-8}$$ m to nanometers (nm).

Accepted Answer

$$25 nm$$

Question 15

A student measures the height of the Sears Tower as $$1454 ft. $$What is this height in meters? ($$1 ft$$ $$= 12 in$$., $$1 in$$. $$= 2.54 cm$$, $$100 cm$$ $$= 1 m)$$

Accepted Answer

$$443.2 m$$

Question 16

Which of the following calculations is correctly rounded to the proper number of significant figures? $$(2.05631 	imes 6.9391136) / 12.59326$$

Accepted Answer

$$1.13306$$

Question 17

A nurse needs to administer $$7.24 g of $$acetone. If the density of acetone is $$0.7857 g/cm$^3$$, what volume in mL should be given?

Accepted Answer

$$9.21 mL$$

Question 18

A car is traveling at $$0.420 in/ms. $$What is its speed in km/hr? ($$1 in$$. $$= 2.54 cm$$, $$100 cm$$ $$= 1 m$$, $$1000 m$$ $$= 1 km$$, $$1 ms$$ $$= 10$$^{-3}$$ s, 1$ hr = 3600$ s)

Accepted Answer

$$38.4 km/hr$$

Question 19

Which of the following has the fewest significant figures?

Accepted Answer

$$0.00013$$

Question 20

A solution has a density of $$1.70 kg/m$^3. $$What is this density in g/L?

Accepted Answer

$$1.70 g/L$$

Study Guide for CHM1025: Chapters 2 and 3 – Scientific Notation, Significant Figures, SI Units, Conversions, and Density

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