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 1.25 g of amoxicillin, which is available in 250-mg tablets. How many tablets are needed?

Accepted Answer

5 tablets

Question 3

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

Accepted Answer

Micro

Question 4

Convert 3.5 Gbyte to kbyte. Report your answer with the correct number of significant figures.

Accepted Answer

$$3.5 	imes 10^6$ kbyte

Question 5

A sample of gold has dimensions 15.5 cm × 27.3 cm × 5.40 in. What is the mass (in kg) of the sample if the density of gold is 19.32 g/mL? (1 in = 2.54 cm)

Accepted Answer

1.12 × $$10^3 kg$$

Question 6

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.

Question 7

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

Accepted Answer

12,500 mL

Question 8

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

Accepted Answer

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

Question 9

Calculate 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 10

A dose of 240 mg of acetaminophen is prescribed for a 20-kg child. If Children’s Tylenol contains 160 mg per 5.0 mL, how many mL should be administered?

Accepted Answer

7.5 mL

Question 11

Which of the following measurements is the most precise?

Accepted Answer

2.500 g

Question 12

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

Accepted Answer

3 tablets

Question 13

Which of the following is an exact number?

Accepted Answer

There are 12 eggs in a dozen

Question 14

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

Accepted Answer

30 mg

Question 15

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

Accepted Answer

1 mL = 1 cm$$^3$$

Question 16

A single 1-oz serving of tortilla chips contains 250 mg of sodium. If an individual ate the entire 13-oz bag, how many grams of sodium would they ingest?

Accepted Answer

3.25 g

Question 17

Which of the following best describes the meaning of the prefix 'nano'?

Accepted Answer

$$10^{-9}$$

Question 18

If a measurement is reported as 27 °C ± 1 °C, what does the ± 1 °C represent?

Accepted Answer

The uncertainty in the measurement

Question 19

Which of the following is the correct formula for density?

Accepted Answer

$$d = \frac{m}{V}$$

Question 20

A scientist measures the mass of a sample four times and gets values that are all very close to each other, but far from the true value. Which of the following best describes the data?

Accepted Answer

Poor accuracy, good precision

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

Guida di studio - Domande di pratica

Study guide - Flashcard