Question 1

Which of the following is a chemical property of a substance?

Accepted Answer

Seashells, calcium carbonate, fizz when immersed in vinegar.

Question 2

How many significant figures are in the number 0.00030450?

Accepted Answer

6

Question 3

Convert 8.45 kg to micrograms ($$\mu g).$$

Accepted Answer

$$8.45 	imes 10^9$\ \mu g$$

Question 4

A rectangular block of gold is 5.6 inches long, 3.04 inches wide, and 2.42 inches high. What is the mass of this block of gold in kg? (Density of gold = $$18.9\ g/cm^3$; 1 inch = 2.54 cm)

Accepted Answer

$$4.97\ kg$$

Question 5

A freighter carrying uranium hexafluoride sank in the English Channel. The cargo weighed $$2.25 	imes 10^4$ kg and had a volume of 1.62$$ 	imes $$10^4 L. $$What is the density ($$g/cm^3) of $$uranium hexafluoride?

Accepted Answer

$$1.39\ g/cm^3$

Question 6

Zinc metal reacts with sulfur to produce zinc sulfide. If 65.4 g of zinc reacts with 32.1 g of sulfur, how many grams of zinc sulfide ($$ZnS) $$would be produced?

Accepted Answer

$$97.5\ g$$

Question 7

Complete the following table for $$^{80}_{34}Se$$^{2+}$$: What is the atomic number?

Accepted Answer

34

Question 8

Which of the following elements is a nonmetal and is found in Group 14 of the periodic table?

Accepted Answer

C

Question 9

What is the formula for magnesium sulfide?

Accepted Answer

$$MgS$$

Question 10

How many moles are present in 33.5 g of potassium sulfate ($$K_2SO_4$$)? (Molar mass = $$174.26\ g/mol)$$

Accepted Answer

$$0.193\ mol$$

Question 11

How many water molecules are present in a 10.0 g sample of water? ($$M_{H_2O} = 18.02\ g/mol$$; $$N_A = 6.022 	imes 10$$^{23}$$)

Accepted Answer

$$3.34 	imes 10$$^{23}$$

Question 12

An unidentified element has two naturally occurring isotopes: 60.4% with a mass of 68.9257 amu and 39.6% with a mass of 70.9249 amu. What is the average atomic mass?

Accepted Answer

$$69.72\ amu$$

Question 13

An oxide of iron has the formula $$Fe_2O_3. $$What is the mass percent of iron in this compound? ($$M_{Fe} = 55.85\ g/mol$$, $$M_{O} = 16.00\ g/mol)$$

Accepted Answer

69.94%

Question 14

Which of the following is the correct formula for iron(III) oxide?

Accepted Answer

$$Fe_2O_3$$

Question 15

Convert 318 μs (microseconds) to milliseconds.

Accepted Answer

$$0.000318\ ms$$

Question 16

Which of the following is the correct name for $$H_3PO_4$$?

Accepted Answer

Phosphoric acid

Question 17

A compound has an empirical formula of $$CH_2$$ and a molar mass of $$56.11\ g/mol. $$What is its molecular formula?

Accepted Answer

$$C_4H_8$$

Question 18

Which of the following is the correct formula for calcium nitride?

Accepted Answer

$$Ca_3N_2$$

Question 19

Convert 93 km to nanometers.

Accepted Answer

$$9.3 	imes 10$$^{13}$$\ nm$$

Question 20

Which of the following is a physical property?

Accepted Answer

Pure water freezes at 0°C.

General Chemistry: Fundamental Concepts and Problem-Solving Practice

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