Q: A sample of gold has dimensions $$15.5 \ \mathrm{cm} \times 27.3 \ \mathrm{cm} \times 5.40 \ \mathrm{in}. If $$the density of gold is $$19.32 \ \mathrm{g/mL}$$ and $$1 \ \mathrm{in} = 2.54 \ \mathrm{cm}$$, what is the mass in kg? (rounded to 3 significant figures)

$$1.12 \times 10^3$ \ \mathrm{kg}$$

Question 1

Which of the following is the correct SI base unit for measuring temperature?

Accepted Answer

Kelvin (K)

Question 2

A patient is prescribed 975 mg of medication. If each tablet contains 325 mg, how many tablets should the patient take?

Accepted Answer

3 tablets

Question 3

Convert 0.0057 to scientific notation with the correct number of significant figures.

Accepted Answer

$$5.7 	imes 10$$^{-3}$$

Question 4

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

Accepted Answer

Micro

Question 5

A cube of gold has a length of 2.00 cm on each side. If the density of gold is $$19.32 \ \mathrm{g/cm^3$}$$, what is the mass of the cube?

Accepted Answer

$$77.3 \ \mathrm{g}$$

Question 6

Which of the following best describes accuracy in scientific measurement?

Accepted Answer

The closeness of a measurement to the true value

Question 7

A hospital has 125 deciliters (dL) of blood plasma. What is the volume in milliliters (mL)?

Accepted Answer

$$12,500 \ \mathrm{mL}$$

Question 8

Which of the following measurements contains the correct number of significant figures: $$0.00250$$?

Accepted Answer

3 significant figures

Question 9

A sample of mercury has a mass of $$1.00 	imes 10^2$ \ \mathrm{g}$$ and occupies a volume of $$7.36 \ \mathrm{cm^3$}. $$What is the density of mercury?

Accepted Answer

$$13.6 \ \mathrm{g/cm^3$}$$

Question 10

Which of the following is an exact number?

Accepted Answer

There are 12 eggs in a dozen.

Question 11

A child is prescribed 160 mg of ibuprofen. If Children’s Motrin contains 100 mg per 5 mL, how many mL should be administered?

Accepted Answer

8 mL

Question 12

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

Accepted Answer

Precision is the closeness of repeated measurements to each other; accuracy is the closeness to the true value.

Question 13

Convert $$3.5$$ Gbyte to kbyte using metric prefixes.

Accepted Answer

$$3.5 	imes 10^6$ kbyte

Question 14

A 133-lb patient is prescribed isotretinoin at a dose of $$0.5 \ \mathrm{mg/kg}. (1 lb = 0.454 kg) $$How many mg of isotretinoin are needed?

Accepted Answer

$$30 \ \mathrm{mg}$$

Question 15

Which of the following is the correct equivalence statement for volume?

Accepted Answer

$$1 \ \mathrm{mL} = 1 \ \mathrm{cm^3$}$$

Question 16

A woman is told to take 1.5 g of calcium daily. If each tablet contains 500 mg, how many tablets should she take?

Accepted Answer

3 tablets

Question 17

Which of the following is the correct formula for converting Celsius to Kelvin?

Accepted Answer

$$K = ^\circ C + 273.15$$

Question 18

A sample of gold has dimensions $$15.5 \ \mathrm{cm} 	imes 27.3 \ \mathrm{cm} 	imes 5.40 \ \mathrm{in}. If $$the density of gold is $$19.32 \ \mathrm{g/mL}$$ and $$1 \ \mathrm{in} = 2.54 \ \mathrm{cm}$$, what is the mass in kg? (rounded to 3 significant figures)

Accepted Answer

$$1.12 	imes 10^3$ \ \mathrm{kg}$$

Question 19

The LD50 of caffeine is $$192 \ \mathrm{mg/kg}. $$How many cups of coffee (100 mg/cup) would a 59 kg person need to drink to reach this threshold?

Accepted Answer

113 cups

Chapter 1: Matter, Energy, and Measurement – GOB Chemistry Study Notes

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