Question 1

What is the formal charge on the nitrogen atom in ammonia ($$\mathrm{NH_3$}$$)?

Accepted Answer

$$0$$

Question 2

Which of the following elements has the lowest electronegativity?

Accepted Answer

Radium ($$\mathrm{Ra})$$

Question 3

What is the correct name for the compound with the formula $$\mathrm{CS_2$}$$?

Accepted Answer

Carbon disulfide

Question 4

Convert $$39.119\ \mathrm{K} to$$ $$^{\circ}\mathrm{F}. ($$Round to the nearest integer.)

Accepted Answer

$$-389$$

Question 5

What is the VSEPR geometry of ozone ($$\mathrm{O_3$}$$)?

Accepted Answer

Bent

Question 6

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

Accepted Answer

$$\mathrm{NH_4Cl}$$

Question 7

Determine the bond angle for $$\mathrm{$$NCl_3$$}.$$

Accepted Answer

Less than $$109.5^{\circ}$$

Question 8

Which of the following molecules is polar?

Accepted Answer

$$\mathrm{H_3O^+}$$

Question 9

How many valence electrons does a hydrogen atom have?

Accepted Answer

1

Question 10

Draw the Lewis structure for $$\mathrm{$$CCl_2$$^{2-}}. $$How many lone pairs are present on the central atom?

Accepted Answer

2

Question 11

What is the charge of a cesium ion when it forms an ion?

Accepted Answer

$$+1$$

Question 12

How many resonance structures does $$\mathrm{SO_2$}$$ have?

Accepted Answer

2

Question 13

Identify the polyatomic ion: $$\mathrm{PO_4$^{3-}}.$$

Accepted Answer

Phosphate

Question 14

What is the correct formula for sodium acetate?

Accepted Answer

$$\mathrm{NaC_2H_3O_2}$$

Question 15

How many sigma and pi bonds are present in carbon tetrabromide ($$\mathrm{$$CBr_4$$}$$)?

Accepted Answer

4 sigma, 0 pi

Question 16

Which of the following best describes the geometry of boron trihydride ($$\mathrm{BH_3$}$$)?

Accepted Answer

Trigonal planar

Question 17

What is the charge on a barium ion when it forms an ion?

Accepted Answer

$$+2$$

Question 18

Which of the following is the correct name for $$\mathrm{NH_4$^+}$$?

Accepted Answer

Ammonium

Question 19

Which of the following molecules is polar due to the presence of a lone pair on the central atom?

Accepted Answer

$$\mathrm{CH_2O}$$

Question 20

A patient is exposed to $$39.119\ \mathrm{K} in a $$cryogenic procedure. What is this temperature in $$^{\circ}\mathrm{F}$$? (Use $$^{\circ}\mathrm{F} = \frac{9}{5}(K - 273.15) + 32)$$

Accepted Answer

$$-389$$

CHEM 111 Exam 3: Step-by-Step Study Guidance

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