Q: A student needs to convert 24 kilometers per minute to meters per second. Which of the following is the correct setup for dimensional analysis?

$$24\ \mathrm{km/min} \times \frac{1000\ \mathrm{m}}{1\ \mathrm{km}} \times \frac{1\ \mathrm{min}}{60\ \mathrm{s}}$$

Q: Which of the following is a correct example of dimensional analysis for converting 3.7 L to mL?

$$3.7\ \mathrm{L} \times \frac{1000\ \mathrm{mL}}{1\ \mathrm{L}}$$

Question 1

A student measures the boiling point of water as 98.5 $$^\circC$$, 101.2 $$^\circC$$, and 100.0 $$^\circC. $$The accepted value is 100.0 $$^\circC. $$Which statement best describes the student's measurements?

Accepted Answer

The measurements are neither accurate nor precise.

Question 2

Which piece of laboratory glassware is best for measuring 25.00 mL of a solution with the highest precision?

Accepted Answer

Volumetric flask

Question 3

A pharmacist dispenses 15.6 g of capsules. If each capsule weighs 0.65 g, how many capsules were dispensed?

Accepted Answer

$$15.6 \div 0.65 = 24$$ capsules

Question 4

Which of the following numbers has 3 significant figures?

Accepted Answer

1.20

Question 5

Convert 0.000081 to scientific notation.

Accepted Answer

$$8.1 	imes 10$$^{-5}$$

Question 6

A lake has a surface area of $$100\ \mathrm{mi}^2$$ and an average depth of 20 ft. If the mercury concentration is $$0.4\ \mu\mathrm{g}/\mathrm{L}$$, what is the total mass of mercury in kilograms in the lake? (1 mi = 1.609 km, 1 ft = 0.3048 m, 1 L = $$10^{-3} m$^3)$$

Accepted Answer

Approximately $$9.8 kg$$

Question 7

Which of the following best describes an isotope?

Accepted Answer

Atoms with the same number of protons but different numbers of neutrons

Question 8

How many significant figures should the answer to $$13.1\ \mathrm{cm} + 1.2039\ \mathrm{cm} + 15.77109\ \mathrm{cm} be $$reported to?

Accepted Answer

3 significant figures

Question 9

Which of the following is the correct scientific notation for 43,900?

Accepted Answer

$$4.39 	imes 10^4$

Question 10

A student needs to convert 24 kilometers per minute to meters per second. Which of the following is the correct setup for dimensional analysis?

Accepted Answer

$$24\ \mathrm{km/min} 	imes \frac{1000\ \mathrm{m}}{1\ \mathrm{km}} 	imes \frac{1\ \mathrm{min}}{60\ \mathrm{s}}$$

Question 11

Which subatomic particle is responsible for the identity of an element?

Accepted Answer

Proton

Question 12

A student records the following measurements for the length of a paperclip using four different rulers: 2.1 cm, 2.13 cm, 2.134 cm, and 2 cm. Which ruler is the most precise?

Accepted Answer

The ruler that measured 2.134 cm

Question 13

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

Accepted Answer

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

Question 14

Which of the following is a correct statement about significant figures in the number 0.0050830?

Accepted Answer

It has 5 significant figures.

Question 15

A student is asked to find the volume that 35.2 g of a substance will occupy if it has a density of 1.60 g/mL. What is the correct answer?

Accepted Answer

$$V = \frac{35.2\ \mathrm{g}}{1.60\ \mathrm{g/mL}} = 22.0\ \mathrm{mL}$$

Question 16

Which of the following is the correct number of protons, neutrons, and electrons for $$^{36}_{17}\mathrm{Cl}^-$$?

Accepted Answer

17 protons, 19 neutrons, 18 electrons

Question 17

Which of the following best describes a cation?

Accepted Answer

An ion with a positive charge

Question 18

Which of the following is a correct example of dimensional analysis for converting 3.7 L to mL?

Accepted Answer

$$3.7\ \mathrm{L} 	imes \frac{1000\ \mathrm{mL}}{1\ \mathrm{L}}$$

Question 19

Which of the following statements about the periodic table is correct?

Accepted Answer

Groups are vertical columns and periods are horizontal rows.

General Chemistry Fundamentals: Measurement, Atomic Structure, and the Periodic Table

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