Q: Which of the following is the correct factor-label setup to convert 100 cm to inches? ($$1 \ \mathrm{in} = 2.54 \ \mathrm{cm})$$

$$100 \ \mathrm{cm} \times \dfrac{1 \ \mathrm{in}}{2.54 \ \mathrm{cm}}$$

Question 1

A recipe calls for 100 g of olive oil. If the density of olive oil is $$0.92 \ \mathrm{g/mL}$$, how many milliliters of olive oil are needed?

Accepted Answer

108.7 mL

Question 2

Which of the following is the correct relationship for density?

Accepted Answer

$$\mathrm{density} = \dfrac{\mathrm{mass}}{\mathrm{volume}}$$

Question 3

Convert 26.22 miles to kilometers, given that $$1 \ \mathrm{km} = 0.6214 \ \mathrm{mi}.$$

Accepted Answer

42.22 km

Question 4

A car can travel 100 km on 5 L of fuel. What is its fuel efficiency in miles per gallon? ($$1 \ \mathrm{km} = 0.6214 \ \mathrm{mi}$$, $$1 \ \mathrm{gal} = 3.785 \ \mathrm{L})$$

Accepted Answer

13.1 mi/gal

Question 5

Which answer has the correct number of significant figures for the sum $$3.0 \ \mathrm{g} + 126.90 \ \mathrm{g}$$?

Accepted Answer

129.9 g

Question 6

A sample of acetone has a mass of $$5.0 \ \mathrm{g}$$ and a density of $$0.78 \ \mathrm{g/mL}. $$What is its volume in mL?

Accepted Answer

6.4 mL

Question 7

Which metric prefix represents $$10^{-6}$$?

Accepted Answer

micro-

Question 8

If you are 20 years old, approximately how many seconds old are you? (Assume $$1 \ \mathrm{year} = 365.25 \ \mathrm{days})$$

Accepted Answer

630,720,000 seconds

Question 9

Which of the following is the correct factor-label setup to convert 100 cm to inches? ($$1 \ \mathrm{in} = 2.54 \ \mathrm{cm})$$

Accepted Answer

$$100 \ \mathrm{cm} 	imes \dfrac{1 \ \mathrm{in}}{2.54 \ \mathrm{cm}}$$

Question 10

A patient receives a dose of 250 mg of a medication. How many micrograms ($$\mu\mathrm{g}) is $$this?

Accepted Answer

250,000 $$\mu\mathrm{g}$$

Question 11

Which of the following is true about significant figures in multiplication?

Accepted Answer

The answer should have as many significant figures as the number with the fewest significant figures.

Question 12

A solution has a density of $$1.25 \ \mathrm{g/mL}. $$What is the mass of $$80.0 \ \mathrm{mL} of $$this solution?

Accepted Answer

100 g

Question 13

Which of the following is the correct conversion factor to change gallons to liters?

Accepted Answer

$$1 \ \mathrm{gal} = 3.785 \ \mathrm{L}$$

Question 14

A sample weighs 0.0035 kg. How many milligrams is this?

Accepted Answer

3,500 mg

Question 15

Which of the following is the correct number of significant figures for the value $$\dfrac{1.00 	imes 0.08206 	imes 298.15}{1.0068}$$?

Accepted Answer

2.430

Question 16

Which is heavier: a ton of bricks or a ton of feathers?

Accepted Answer

They weigh the same

Question 17

How many nanograms are in 0.000001 grams?

Accepted Answer

1,000,000 ng

Question 18

A nurse needs to administer 2.5 deciliters (dL) of saline. How many milliliters (mL) is this?

Accepted Answer

250 mL

Question 19

Which of the following is the correct conversion factor to change pounds to grams?

Accepted Answer

$$1 \ \mathrm{lb} = 453.6 \ \mathrm{g}$$

Question 20

A student measures the length of a desk as 1.20 m. How many centimeters is this?

Accepted Answer

120 cm

Unit Conversions, Significant Figures, and Density in GOB Chemistry

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