Q: A sample contains 3.0 moles of sodium chloride (NaCl). What is the mass of this sample? (Molar mass of NaCl = 58.44 g/mol)

$$3.0 \times 58.44 = 175.32 g$$

Q: A student needs to convert 250.0 mL to liters using dimensional analysis. Which of the following is the correct setup?

$$250.0\ \mathrm{mL} \times \frac{1\ \mathrm{L}}{1000\ \mathrm{mL}}$$

Question 1

Which of the following best describes a chemical change?

Accepted Answer

Iron rusting when exposed to air

Question 2

A student measures the mass of a sample three times and records 2.51 g, 2.50 g, and 2.52 g. The true mass is 2.80 g. Which statement best describes the measurements?

Accepted Answer

The measurements are precise but not accurate.

Question 3

Which of the following is the correct number of significant figures in the measurement 0.0045600 g?

Accepted Answer

6

Question 4

Which of the following best describes a heterogeneous mixture?

Accepted Answer

Salad with lettuce, tomatoes, and cucumbers

Question 5

A sample contains 3.0 moles of sodium chloride (NaCl). What is the mass of this sample? (Molar mass of NaCl = 58.44 g/mol)

Accepted Answer

$$3.0 	imes 58.44 = 175.32 g$$

Question 6

Which statement is NOT part of Dalton’s Atomic Theory?

Accepted Answer

Atoms can be created or destroyed in chemical reactions.

Question 7

Which of the following is an isotope of carbon?

Accepted Answer

$$^{12}\mathrm{C}$$ and $$^{14}\mathrm{C}$$

Question 8

Which of the following elements is a halogen?

Accepted Answer

Chlorine

Question 9

What is the correct chemical formula for aluminum sulfate?

Accepted Answer

$$\mathrm{Al_2$(SO_4$)_3}$$

Question 10

Which of the following best describes the difference between ionic and molecular (covalent) compounds?

Accepted Answer

Ionic compounds are formed by transferring electrons, while molecular compounds are formed by sharing electrons.

Question 11

A student needs to convert 250.0 mL to liters using dimensional analysis. Which of the following is the correct setup?

Accepted Answer

$$250.0\ \mathrm{mL} 	imes \frac{1\ \mathrm{L}}{1000\ \mathrm{mL}}$$

Question 12

Which of the following names is correct for the compound $$\mathrm{Fe_2O_3}$$?

Accepted Answer

Iron(III) oxide

Question 13

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

Accepted Answer

Elements in the same group have similar chemical properties.

Question 14

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

Accepted Answer

$$\mathrm{CH_2O}$$

Question 15

Which of the following is a correct example of a physical property?

Accepted Answer

Density

Question 16

Which of the following best describes the nucleus of an atom?

Accepted Answer

It contains protons and neutrons.

Question 17

Which of the following is the correct name for $$\mathrm{N_2O_5}$$?

Accepted Answer

Dinitrogen pentoxide

Question 18

A sample of gold has a mass of 19.3 g and a volume of 1.00 cm$$^3. $$What is the density of gold?

Accepted Answer

$$19.3\ \mathrm{g/cm^3$}$$

Question 19

Which of the following is the correct formula for magnesium chloride?

Accepted Answer

$$\mathrm{$$MgCl_2$$}$$

Question 20

Which of the following is a correct example of dimensional analysis for converting 5.00 km to meters?

Accepted Answer

$$5.00\ \mathrm{km} 	imes \frac{1000\ \mathrm{m}}{1\ \mathrm{km}}$$

General Chemistry Foundations: Matter, Measurement, Atomic Theory, and Chemical Bonding

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