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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