Q: A sample contains 8.92 g of nitrogen dioxide ($$\mathrm{NO_2$}). $$How many molecules are present? (Molar mass of $$\mathrm{NO_2$} = 46.0 g/$$mol, $$N_A = 6.022 \times 10$$^{23}$$ mol$$^{-1}$$)

$$1.17 \times 10$$^{23}$$ molecules

Q: Which of the following pairs of solutions will NOT produce a precipitate when mixed?

$$\mathrm{KI}$$ \text{ and } \mathrm{Ca($$NO_3)_2$$}$

Question 1

Which of the following best describes the octet rule?

Accepted Answer

Atoms tend to gain, lose, or share electrons to achieve a full set of eight valence electrons.

Question 2

What is the formula for the ionic compound formed between aluminum and sulfur?

Accepted Answer

$$\mathrm{Al_2S_3}$$

Question 3

Which of the following ions is a polyatomic ion?

Accepted Answer

$$\mathrm{NO_3$^-}$$

Question 4

A sample contains 8.92 g of nitrogen dioxide ($$\mathrm{NO_2$}). $$How many molecules are present? (Molar mass of $$\mathrm{NO_2$} = 46.0 g/$$mol, $$N_A = 6.022 	imes 10$$^{23}$$ mol$$^{-1}$$)

Accepted Answer

$$1.17 	imes 10$$^{23}$$ molecules

Question 5

Which of the following compounds is most likely to be insoluble in water?

Accepted Answer

$$\mathrm{$$CaCO_3$$}$$

Question 6

What is the correct name for $$\mathrm{Fe_2O_3}$$?

Accepted Answer

Iron (III) oxide

Question 7

Which of the following best describes the bonding in sodium chloride ($$\mathrm{NaCl}$$)?

Accepted Answer

Ionic bonding due to electron transfer from sodium to chlorine

Question 8

Which of the following ions is most likely to form from a Group 6A element?

Accepted Answer

$$\mathrm{O$$^{2-}$$}$$

Question 9

What is the net ionic equation for the reaction between aqueous solutions of sodium carbonate and calcium chloride?

Accepted Answer

$$\mathrm{Ca$$^{2+}$$(aq) + CO_3$^{2-}(aq) \rightarrow $$CaCO_3$$(s)}$$

Question 10

Which of the following best explains why noble gases are generally unreactive?

Accepted Answer

They have a full valence shell of electrons.

Question 11

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

Accepted Answer

$$\mathrm{(NH_4$)_2SO_4}$$

Question 12

Which of the following statements about transition metals is TRUE?

Accepted Answer

Transition metals can form more than one stable ionic charge.

Question 13

Which of the following best describes the process of solvation?

Accepted Answer

Solvent molecules surround and interact with solute ions or molecules.

Question 14

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

Accepted Answer

Cobalt(II) sulfide

Question 15

Which of the following pairs of solutions will NOT produce a precipitate when mixed?

Accepted Answer

$$\mathrm{KI}$$ 	ext{ and } \mathrm{Ca($$NO_3)_2$$}$

Question 16

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

Accepted Answer

$$\mathrm{Mg(OH)_2}$$

Question 17

How many valence electrons does chlorine (Cl, Z=17) have?

Accepted Answer

7

Question 18

Which of the following best describes the trend in electronegativity across a period in the periodic table?

Accepted Answer

Electronegativity increases from left to right.

Question 19

Which of the following is the correct name for $$\mathrm{Na_2SO_4}$$?

Accepted Answer

Sodium sulfate

Question 20

A compound contains the ammonium ion and the nitrate ion. What is its correct formula?

Accepted Answer

$$\mathrm{NH_4NO_3}$$

Chemical Bonds, Ionic Compounds, and Aqueous Reactions: Study Notes for General Chemistry

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