Question 1

Which of the following statements best explains why sodium chloride (NaCl) conducts electricity when dissolved in water but not in its solid form?

Accepted Answer

In solid NaCl, ions are locked in place and cannot move, but when dissolved in water, the ions are free to move and carry electric current.

Question 2

A magnesium atom (Z=12) forms an ion by losing electrons. What is the symbol for this ion, and what is its electron configuration?

Accepted Answer

Mg$$^{2+}$$; $$1s^2$$\ $$2s^2$$\ $$2p^6$$

Question 3

Which of the following ions is most likely to form based on the octet rule and periodic trends?

Accepted Answer

Sr$$^{2+}$$

Question 4

What is the correct formula for the ionic compound formed between calcium ions and nitrate ions?

Accepted Answer

Ca(NO$$_3$$)$$_2$$

Question 5

Which of the following best describes the difference between a cation and an anion?

Accepted Answer

A cation is a positively charged ion formed by losing electrons, while an anion is a negatively charged ion formed by gaining electrons.

Question 6

Which of the following compounds is named correctly according to the rules for naming ionic compounds containing transition metals?

Accepted Answer

Fe$$_2O$_3 is $$iron(III) oxide

Question 7

Which of the following ions is a polyatomic ion?

Accepted Answer

NO$$_3^-$$

Question 8

A nitrogen atom (Z=7) forms an ion to achieve a noble gas configuration. How many electrons does it gain, and what is the symbol for the resulting ion?

Accepted Answer

It gains 3 electrons to form N$$^{3-}.$$

Question 9

Which of the following best explains why ionic compounds generally have high melting and boiling points?

Accepted Answer

Strong electrostatic attractions between oppositely charged ions require a large amount of energy to break.

Question 10

Which of the following formulas is correct for the compound formed between aluminum ions and sulfate ions?

Accepted Answer

Al$$_2(SO$_4$$)$$_3$$

Question 11

Which of the following statements about acids and bases is correct?

Accepted Answer

Acids provide H$$^+$$ ions in water, while bases provide OH$$^-$$ ions in water.

Question 12

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

Accepted Answer

Ionization energy increases from left to right across a period.

Question 13

What is the correct name for the compound K$$_2SO$_4$$?

Accepted Answer

Potassium sulfate

Question 14

Which of the following ions is most likely to be formed by a group 7A (halogen) element?

Accepted Answer

X$$^-$$

Question 15

A patient is given a solution of sodium sulfate (Na$$_2SO$_4) $$intravenously. Which ions are present in the solution?

Accepted Answer

Na$$^+$$ and SO$$_4$$^{2-}$$

Question 16

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

Accepted Answer

FeCl$$_3$$

Question 17

Which of the following best explains why noble gases do not typically form ions?

Accepted Answer

They already have a stable octet of electrons and do not gain or lose electrons easily.

Question 18

Which of the following is the correct name for the compound Ba(OH)$$_2$$?

Accepted Answer

Barium hydroxide

Question 19

Which of the following best describes the bonding in a polyatomic ion such as NO$$_3^-$$?

Accepted Answer

The atoms are held together by covalent bonds, but the ion as a whole carries a charge.

Question 20

Which of the following is the correct formula for the compound formed between ammonium ions and phosphate ions?

Accepted Answer

(NH$$_4$$)$$_3PO$_4$$

Ionic Compounds: Structure, Formation, and Properties

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