Q: Which of the following is the correct formula to convert 2.50 gallons to liters using the provided conversion factor?

$$2.50 \times 3.785 \, \text{L}$$

Q: Which of the following is the correct formula for calculating the number of moles from mass and molar mass?

$$\text{moles} = \frac{\text{mass}}{\text{molar mass}}$$

Q: Which of the following is the correct dimensional analysis setup to convert 5280 ft to miles?

$$5280 \times \frac{1}{5280} \, \text{mi}$$

Q: Which of the following is the correct formula for calculating percent composition by mass?

$$\frac{\text{mass of element}}{\text{total mass of compound}} \times 100\%$$

Q: Which of the following is the correct setup to convert 1.00 lb to grams using the provided conversion factor?

$$1.00 \times 453.6 \, \text{g}$$

Question 1

Which of the following best describes the difference between a compound and a mixture?

Accepted Answer

A compound consists of two or more elements chemically bonded in fixed proportions, while a mixture contains two or more substances physically combined in variable proportions.

Question 2

Which of the following is the correct formula to convert 2.50 gallons to liters using the provided conversion factor?

Accepted Answer

$$2.50 	imes 3.785 \, 	ext{L}$$

Question 3

A student measures the mass of a sample as 4.50 g and its volume as 1.50 mL. What is the density of the sample?

Accepted Answer

$$3.00 \, 	ext{g/mL}$$

Question 4

Which of the following is NOT a physical property?

Accepted Answer

Reactivity with acid

Question 5

Which statement about isotopes is correct?

Accepted Answer

Isotopes of an element have the same number of protons but different numbers of neutrons.

Question 6

What is the molar mass of water ($$\mathrm{H_2O}$$)?

Accepted Answer

$$18.02 \, 	ext{g/mol}$$

Question 7

Which of the following best describes the law of definite proportions?

Accepted Answer

A chemical compound always contains exactly the same proportion of elements by mass.

Question 8

A sample contains $$3.01 	imes 10$$^{23}$$ molecules of $$\mathrm{$$CO_2$$}$$. How many moles of $$\mathrm{$$CO_2$$}$$ are present?

Accepted Answer

$$0.500 \, 	ext{mol}$$

Question 9

Which of the following is the correct electron configuration for a neutral oxygen atom?

Accepted Answer

$$1s^2$$ $$2s^2$$ $$2p^4$$

Question 10

Which of the following is the correct formula for calculating the number of moles from mass and molar mass?

Accepted Answer

$$	ext{moles} = \frac{	ext{mass}}{	ext{molar mass}}$$

Question 11

A compound contains 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen by mass. What is the empirical formula?

Accepted Answer

$$\mathrm{CH_2O}$$

Question 12

Which of the following is a correct example of modern systematic nomenclature for an ionic compound?

Accepted Answer

Sodium chloride

Question 13

Which of the following statements about Dalton’s atomic theory is FALSE?

Accepted Answer

Atoms can be divided into protons, neutrons, and electrons.

Question 14

A student needs to prepare 250 mL of a 0.100 M NaCl solution. How many grams of NaCl are required? ($$	ext{Molar mass of NaCl} = 58.44 \, 	ext{g/mol})$$

Accepted Answer

$$1.46 \, 	ext{g}$$

Question 15

Which of the following is the correct dimensional analysis setup to convert 5280 ft to miles?

Accepted Answer

$$5280 	imes \frac{1}{5280} \, 	ext{mi}$$

Question 16

Which of the following is a chemical change?

Accepted Answer

Rusting of iron

Question 17

Which of the following is the correct formula for calculating percent composition by mass?

Accepted Answer

$$\frac{	ext{mass of element}}{	ext{total mass of compound}} 	imes 100\%$$

Question 18

Which of the following best explains why noble gases are chemically inert?

Accepted Answer

They have completely filled valence electron shells.

Question 19

Which of the following is the correct setup to convert 1.00 lb to grams using the provided conversion factor?

Accepted Answer

$$1.00 	imes 453.6 \, 	ext{g}$$

Question 20

Which of the following is the correct formula for calculating the number of particles from moles?

Accepted Answer

$$	ext{particles} = 	ext{moles} 	imes N_A$$

General Chemistry Syllabus and Study Guide: Fundamental Concepts and Calculations

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