Question 1

Which of the following best describes the difference between an atomic element and a molecular element?

Accepted Answer

Atomic elements exist as single atoms, while molecular elements exist as molecules composed of two or more atoms of the same element.

Question 2

Which of the following compounds is an example of an ionic compound?

Accepted Answer

NaCl

Question 3

What is the correct chemical formula for a compound formed between aluminum ions ($$\mathrm{Al$$^{3+}$$}) $$and oxide ions ($$\mathrm{O$$^{2-}$$}$$)?

Accepted Answer

$$\mathrm{Al_2O_3}$$

Question 4

Which of the following is the correct name for the compound $$\mathrm{Fe_2O_3}$$ using the Stock system?

Accepted Answer

Iron (III) oxide

Question 5

A sample of a substance decomposes to produce 42.0 g of carbon and 14.1 g of hydrogen. What is the empirical formula of the substance? (Atomic masses: C = 12.01, H = 1.008)

Accepted Answer

$$\mathrm{CH_2$}$$

Question 6

Which of the following ions is a polyatomic cation?

Accepted Answer

$$\mathrm{NH_4$^+}$$

Question 7

What is the correct name for $$\mathrm{N_2O}$$?

Accepted Answer

Dinitrogen monoxide

Question 8

How many grams of carbon dioxide are present in $$4.22 	imes 10$$^{22}$$ molecules of carbon dioxide? (Molar mass of $$\mathrm{$$CO_2$$}$$ = 44.01 g/mol, Avogadro's number = 6.022$$ 	imes $$10^{23})$$

Accepted Answer

3.09 g

Question 9

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

Accepted Answer

$$\mathrm{MgS_2O_3}$$

Question 10

A hydrate is a compound that contains:

Accepted Answer

A specific amount of water chemically bound to it

Question 11

What is the mass percent of sodium in sodium carbonate ($$\mathrm{Na_2CO_3}$$)? (Atomic masses: Na = 22.99, C = 12.01, O = 16.00)

Accepted Answer

43.39%

Question 12

Which of the following is the correct molecular formula for fructose, given its empirical formula is $$\mathrm{CH_2O}$$ and its molar mass is 180.2 g/mol? (Empirical mass = 30.03 g/mol)

Accepted Answer

$$\mathrm{C_6H_{12}O_6$}$$

Question 13

Which of the following is the correct name for $$\mathrm{$$HNO_2$$}$$?

Accepted Answer

Nitrous acid

Question 14

What is the correct formula for iron (III) carbonate?

Accepted Answer

$$\mathrm{Fe_2$(CO_3$)_3}$$

Question 15

Which of the following best describes the process of combustion analysis for determining percent composition?

Accepted Answer

Burning a sample to produce $$\mathrm{CO_2$}$$ and $$\mathrm{H_2O}$$, then measuring their masses to calculate the amount of C and H in the original sample.

Question 16

Which of the following is the correct formula for ammonium dichromate?

Accepted Answer

$$\mathrm{(NH_4$)_2Cr_2O_7}$$

Question 17

How many sodium atoms are in 0.500 g of sodium phosphate ($$\mathrm{Na_3PO_4}$$)? (Molar mass = 163.94 g/mol, Avogadro's number = $$6.022 	imes 10$$^{23}$$)

Accepted Answer

$$5.51 	imes 10$$^{21}$$

Question 18

Which of the following is the correct name for $$\mathrm{$$ClO_2$$}$$?

Accepted Answer

Chlorine dioxide

Question 19

Which of the following best describes the difference between molecular weight and formula weight?

Accepted Answer

Molecular weight is used for molecular compounds, while formula weight is used for ionic compounds.

Molecules and Compounds: Structure, Nomenclature, and Calculations

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