Question 1

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

Accepted Answer

Mole (mol)

Question 2

A patient is prescribed 975 mg of medication. How many grams is this? (Report your answer with the correct number of significant figures.)

Accepted Answer

$$0.975 g$$

Question 3

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

Accepted Answer

Micro

Question 4

Convert $$3.5$$ Gbytes to kbytes. (Use the correct number of significant figures.)

Accepted Answer

$$3.5 	imes 10^6$ kbytes

Question 5

A thermometer reads $$37.0^\circC. $$What is this temperature in Kelvin?

Accepted Answer

$$310.2 K$$

Question 6

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

Accepted Answer

$$155 g$$

Question 7

Which of the following best describes a measurement that is both accurate and precise?

Accepted Answer

Measurements are close to the true value and close to each other.

Question 8

A sample of gold is cut to $$15.5 cm$$ $$	imes$$ $$27.3 cm$$ $$	imes$$ $$5.40 in. $$What is the mass (in kg) if the density of gold is $$19.32 g/mL$$? ($$1 in$$ $$= 2.54 cm)$$

Accepted Answer

$$1120 kg$$

Question 9

Which of the following is an exact number?

Accepted Answer

There are $$12$$ eggs in a dozen

Question 10

A child is prescribed $$160 mg of $$ibuprofen. How many mL of Children’s Motrin (which contains $$100 mg $$per $$5 mL) $$are needed?

Accepted Answer

$$8 mL$$

Question 11

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

Accepted Answer

$$1 mL$$ $$= 1 cm$^3$$

Question 12

A hospital has $$125$$ deciliters of blood plasma. What is the volume in milliliters?

Accepted Answer

$$12,500 mL$$

Question 13

Which instrument would you use to deliver a specific, fixed volume of liquid most accurately?

Accepted Answer

Volumetric flask

Question 14

A $$133-lb $$patient is prescribed isotretinoin at $$0.5 mg/kg. $$How many mg are needed? ($$1 lb$$ $$= 0.454 kg)$$

Accepted Answer

$$30 mg$$

Question 15

Which of the following numbers has four significant figures?

Accepted Answer

$$8000.$$

Question 16

A scientist measures the mass of a sample four times and gets values close to each other but far from the true value. This data set is:

Accepted Answer

Precise but not accurate

Question 17

What is the density of mercury if $$1.00 	imes 10^2$ g occupies a volume of 7.36$ cm^3$?

Accepted Answer

$$13.6 g/cm$^3$$

Question 18

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

Accepted Answer

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

Question 19

A $$1-oz $$serving of tortilla chips contains $$250 mg of $$sodium. If an individual eats a $$13-oz $$bag, how many grams of sodium are ingested?

Accepted Answer

$$3.25 g$$

Question 20

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

Accepted Answer

Accuracy is how close measurements are to the true value; precision is how close measurements are to each other.

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

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