Question 1

Which of the following is the correct formula for dinitrogen trioxide?

Accepted Answer

$$N_2O_3$$

Question 2

Given the structure of dopamine, which bond (1, 2, or 3) is the most polar based on the electronegativity values shown in the periodic table?

Accepted Answer

Bond 3 (C=O)

Question 3

What is the correct name for the compound with the formula $$BF_3$$?

Accepted Answer

boron trifluoride

Question 4

Which Lewis structure represents $$PBr_3$$ and what is its molecular shape according to VSEPR theory?

Accepted Answer

The structure with three Br atoms bonded to a central P atom, with one lone pair on P; shape is pyramidal.

Question 5

Which pair of atoms is most likely to form an ionic bond?

Accepted Answer

K and I

Question 6

A patient receives 25 mg of $$I$$-$$123 ($$half-life = 13 hours) at 9:00 a.m. Tuesday. How much remains at 11:00 a.m. Wednesday?

Accepted Answer

6.3 mg

Question 7

Which compound below is classified as covalent?

Accepted Answer

$$CO_2$$

Question 8

What is the charge of the ion formed by an element in Group 2A?

Accepted Answer

$$2+$$

Question 9

Which of the following bonds is more polar: $$C-N or$$ $$C-H$$?

Accepted Answer

$$C-N$$

Question 10

Which intermolecular force is dominant in $$NH_3$$?

Accepted Answer

hydrogen bonds

Question 11

Balance the following equation for the reaction of zinc with hydrochloric acid:
$$\_\_\_Zn(s) + \_\_\_HCl(aq) \rightarrow \_\_\_ZnCl_2(aq) + \_\_\_H_2(g)$$

Accepted Answer

$$1\ Zn(s) + 2\ HCl(aq) \rightarrow 1\ $$ZnCl_2$$(aq) + 1\ H_2$(g)$$

Question 12

Which molecule is nonpolar because the charge is distributed evenly across the molecule?

Accepted Answer

$$SiCl_4$$

Question 13

What is the formula for sulfur dichloride?

Accepted Answer

$$SCl_2$$

Question 14

Which reaction type is represented by $$SO_3(g) + H_2O(l$$) \rightarrow H_2SO_4(aq)$$?

Accepted Answer

combination reaction

Question 15

Which molecule below is polar because the charge is not distributed evenly across the molecule?

Accepted Answer

$$CHFCl_2$$

Question 16

Which of the following compounds experiences only dispersion forces between identical molecules?

Accepted Answer

$$CH_4$$

Question 17

What is the correct formula for diphosphorus tetraiodide?

Accepted Answer

$$P_2I_4$$

Question 18

Which molecule has a tetrahedral shape according to VSEPR theory?

Accepted Answer

$$CH_4$$

Question 19

Which of the following is the correct formula for silicon dioxide?

Accepted Answer

$$SiO_2$$

Chem121 Midterm #2 Study Guide – Step-by-Step Guidance

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