Question 1

Which of the following best describes why sodium (Na) forms a $$\mathrm{Na^+}$$ ion when it reacts with chlorine (Cl) to form table salt ($$\mathrm{NaCl}$$)?

Accepted Answer

Sodium loses one electron to achieve the electron configuration of neon, forming $$\mathrm{Na^+}.$$

Question 2

Which of the following elements will form an anion with a $$2-$$ charge to achieve a noble gas configuration?

Accepted Answer

Oxygen ($$\mathrm{O})$$

Question 3

How many valence electrons are represented in the Lewis dot symbol for a neutral phosphorus ($$\mathrm{P}) $$atom?

Accepted Answer

$$5$$

Question 4

Which of the following is the correct formula for the ionic compound formed between magnesium and nitrogen?

Accepted Answer

$$\mathrm{Mg_2N_3}$$

Question 5

Which of the following is a polyatomic ion?

Accepted Answer

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

Question 6

What is the correct name for $$\mathrm{$$CaCO_3$$}$$?

Accepted Answer

Calcium carbonate

Question 7

Calculate the formula mass of $$\mathrm{Na_2SO_4}$$ using the following atomic masses: $$\mathrm{Na}$$ = $$23.0 u$$, $$\mathrm{S}$$ = $$32.1 u$$, $$\mathrm{O}$$ = $$16.0 u.$$

Accepted Answer

$$142.1 u$$

Question 8

When potassium chloride ($$\mathrm{KCl}) $$dissolves in water, what happens at the molecular level?

Accepted Answer

$$\mathrm{K^+}$$ and $$\mathrm{Cl^-}$$ ions dissociate and disperse throughout the solution.

Question 9

Which of the following compounds is a strong electrolyte when dissolved in water?

Accepted Answer

$$\mathrm{NaCl} ($$sodium chloride)

Question 10

Which statement best describes a covalent bond?

Accepted Answer

A bond formed by the sharing of electrons between two nonmetal atoms.

Question 11

How many covalent bonds would a nitrogen atom most likely form to satisfy the octet rule?

Accepted Answer

Three

Question 12

Which of the following is the correct name for $$\mathrm{N_2O_4}$$?

Accepted Answer

Dinitrogen tetroxide

Question 13

Which of the following elements exists as a diatomic molecule in its natural state?

Accepted Answer

Oxygen ($$\mathrm{O_2$})$$

Question 14

How many total electrons are shared in a triple bond?

Accepted Answer

Six

Question 15

Which bond is the most polar based on the difference in electronegativity?

Accepted Answer

$$\mathrm{H-F}$$

Question 16

Calculate the molecular mass of $$\mathrm{CO_2$}$$ given $$\mathrm{C}$$ = $$12.0 u $$and $$\mathrm{O}$$ = $$16.0 u.$$

Accepted Answer

$$44.0 u$$

Question 17

What is the electron pair geometry of $$\mathrm{CH_4$}$$ according to VSEPR theory?

Accepted Answer

Tetrahedral

Question 18

Which of the following molecules is nonpolar, even though it contains polar bonds?

Accepted Answer

$$\mathrm{CO_2$}$$

Question 19

Which of the following best describes the meaning of the arrow ($$\rightarrow) in a $$chemical equation?

Accepted Answer

It separates the products from the reactants and indicates the direction of the reaction.

Question 20

How many oxygen atoms are present in $$3$$ molecules of $$\mathrm{Al_2$(SO_4$)_3}$$?

Accepted Answer

$$36$$

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