Q: A solution is prepared by dissolving $$17.2 g of $$NaOH in $$250.0 mL of $$water. What is the molarity of the solution? ($$M_{NaOH} = 40.0 g/$$mol)

$$1.72$$ \text{ mol} / 0.250$$ L = 6.88$ M

Question 1

A 2.00 L flask contains 0.320 moles of liquid bromine. How many bromine molecules are in the flask? Use Avogadro's number $$6.022 	imes 10$$^{23}$$ mol$$^{-1}$$.

Accepted Answer

$$1.93 	imes 10$$^{24}$$

Question 2

Which of the following statements about subatomic particles is true?

Accepted Answer

Protons and neutrons have approximately the same mass.

Question 3

A sample of glucose ($$C_6H_{12}O_6$) contains 1.773$$ 	imes $$10^{21}$$ molecules of glucose. How many moles of glucose does this sample contain?

Accepted Answer

$$2.94 	imes 10$$^{-3}$$ mol

Question 4

Which of the following compounds would you expect to be ionic?

Accepted Answer

NaCl

Question 5

A 2.0 L balloon is filled with a gas at 5.0 atm. If the pressure is reduced to 0.50 atm without a change in temperature, what would the volume of the balloon be?

Accepted Answer

$$20 L$$

Question 6

Which of the following atoms has the largest atomic radius?

Accepted Answer

K

Question 7

Which of the following elements has the largest second ionization energy (IE$$_2$$)?

Accepted Answer

Na

Question 8

A sample of air at normal room pressure and $$25^\circC $$has a density of $$1.19 g/L. $$What is the mass in kilograms of the air in a room that measures $$14.3 m$$ $$	imes$$ $$17.5 m$$ $$	imes$$ $$8.00 m$$?

Accepted Answer

$$2.38 	imes 10^2$ kg

Question 9

Which of the following best describes the difference between an ionic and a covalent compound?

Accepted Answer

Ionic compounds are formed from the transfer of electrons, covalent compounds from the sharing of electrons.

Question 10

Which of the following is the correct electron configuration for sodium (Na)?

Accepted Answer

$$1s^2$$ $$2s^2$$ $$2p^6$$ $$3s^1$$

Question 11

A solution is prepared by dissolving $$17.2 g of $$NaOH in $$250.0 mL of $$water. What is the molarity of the solution? ($$M_{NaOH} = 40.0 g/$$mol)

Accepted Answer

$$1.72$$ 	ext{ mol} / 0.250$$ L = 6.88$ M

Question 12

Which of the following statements about the kinetic molecular theory is correct?

Accepted Answer

Gas particles are in constant, random motion and collisions are perfectly elastic.

Question 13

Which of the following is the empirical formula of a compound that is 85.6% C and 14.4% H by mass?

Accepted Answer

$$CH_2$$

Question 14

Which of the following has the highest lattice energy?

Accepted Answer

LiF

Question 15

Which of the following is NOT a valid set of four quantum numbers $$(n, l, m_l, m_s)$$?

Accepted Answer

$$2, 2, 1, +1/2$$

Question 16

Which of the following best explains why the atomic radius increases down a group in the periodic table?

Accepted Answer

The number of energy levels increases.

Question 17

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

Accepted Answer

BaCO$$_3$$

Question 18

Which of the following is the correct Lewis structure for carbon dioxide (CO$$_2$$)?

Accepted Answer

O=C=O, with each O atom having two lone pairs

Question 19

Which of the following is the correct order of increasing boiling point for the following substances: CH$$_4$$, CH$$_3Cl$$, CH$$_3OH$$, H$$_2O$$?

Accepted Answer

CH$$_4$$ \u003c CH$$_3Cl$$ \u003c CH$$_3OH$$ \u003c H$$_2O$$

Question 20

Which of the following is the correct name for Mg(NO$$_3$$)$$_2$$?

Accepted Answer

Magnesium nitrate

General Chemistry I: Comprehensive Study Guide (Practice Final Exam Topics)

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