Question 1

Which element among Al, P, and Cl has the largest atomic radius, and why?

Accepted Answer

Al, because atomic radius decreases across a period from left to right.

Question 2

Which element among N, O, and F has the highest first ionization energy, and what is the main reason?

Accepted Answer

F, because ionization energy increases across a period and F is furthest right.

Question 3

Which element among F, Cl, and Br has the highest electron affinity, and why?

Accepted Answer

F, because it is the most electronegative and smallest in size.

Question 4

Identify the compound type and name for Cr2(SO4)3.

Accepted Answer

Ionic, chromium(III) sulfate

Question 5

What is the correct name for N2O5, and is it molecular or ionic?

Accepted Answer

Molecular, dinitrogen pentoxide

Question 6

Which of the following is the correct formula for the compound formed from Na$$^+$$ and O$$^{2-}$$?

Accepted Answer

$$\mathrm{Na_2O}$$

Question 7

What is the correct formula for the compound formed from NH$$_4^+$$ and CO$$_3$$^{2-}$$?

Accepted Answer

$$\mathrm{(NH_4$)_2CO_3}$$

Question 8

Which polyatomic ion has the formula $$\mathrm{NO_3$^-}$$?

Accepted Answer

Nitrate ion

Question 9

What is the correct name for the acid formed from the $$\mathrm{$$ClO_3$$^-}$$ anion?

Accepted Answer

Chloric acid

Question 10

Draw the Lewis structure for SF$$_4. $$How many lone pairs are on the central atom?

Accepted Answer

1 lone pair

Question 11

Which of the following best describes the bond lengths in the nitrate ion ($$\mathrm{NO_3$^-}) $$based on its resonance structures?

Accepted Answer

All N-O bonds are the same length due to resonance.

Question 12

Which of the following is the correct formula for the compound formed from aluminum and nitrate ions?

Accepted Answer

$$\mathrm{Al(NO_3$)_3}$$

Question 13

Which of the following is the correct formula for the compound formed from Pb$$^{2+}$$ and OCl$$^-$$?

Accepted Answer

$$\mathrm{Pb(OCl)_2}$$

Question 14

Which of the following is the correct formula for the compound formed from Al$$^{3+}$$ and N$$^{3-}$$?

Accepted Answer

$$\mathrm{AlN}$$

Question 15

Which of the following is the correct formula for the compound formed from K$$^+$$ and CO$$_3$$^{2-}$$?

Accepted Answer

$$\mathrm{K_2CO_3}$$

Question 16

Which of the following is the correct name for the acid formed from the $$\mathrm{NO_3$^-}$$ anion?

Accepted Answer

Nitric acid

Question 17

Which of the following is the correct formula for the compound formed from silver and sulfide ions?

Accepted Answer

$$\mathrm{Ag_2S}$$

Question 18

Which of the following is the correct formula for the carbonate ion?

Accepted Answer

$$\mathrm{CO_3$^{2-}}$$

Question 19

Which resonance structure of HCNO is most plausible based on formal charges, and why?

Accepted Answer

Structure A, because it has formal charges closest to zero and negative charge on the most electronegative atom.

Formal Charge Assignment and Resonance Structure Plausibility for HCNO

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