$$1.51 \times 10$$^{24}$$ atoms

Question 1

Which quantum number indicates the shape or type of an atomic orbital?

Accepted Answer

Angular momentum quantum number ($$l)$$

Question 2

Which of the following electron configurations is NOT possible for a ground-state atom?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^6$$\ $$3s^2$$\ $$3p^6$$\ $$4s^2$$\ $$3d^{11}$$

Question 3

Which of the following is a correct name for the compound $$Fe_2O_3$$?

Accepted Answer

Iron(III) oxide

Question 4

What is the correct formula for hydrobromic acid?

Accepted Answer

$$HBr$$

Question 5

Which of the following best describes a single replacement reaction?

Accepted Answer

$$AB + C \rightarrow AC + B$$

Question 6

A student mixes solutions of $$AgNO_3$$ and $$NaCl. $$What is the precipitate formed?

Accepted Answer

$$AgCl$$

Question 7

Which of the following is the correct net ionic equation for the reaction between $$BaCl_2$$ and $$Na_2SO_4$$?

Accepted Answer

$$Ba^{2+} (aq$$) + $$SO_4$$^{2-} (aq) \rightarrow $$BaSO_4 (s$$)$$

Question 8

How many moles are in $$12.0$$ grams of carbon? (Atomic mass of C = $$12.0 g/$$mol)

Accepted Answer

$$1.00$$ mol

Question 9

Which of the following is a decomposition reaction?

Accepted Answer

$$2H_2O_2 \rightarrow 2H_2O + O_2$

Question 10

A sample contains $$3.01 	imes 10$$^{23}$$ molecules of CO_2$. How many moles of CO_2$ are present?

Accepted Answer

$$0.50$$ mol

Question 11

Which of the following is the correct name for $$N_2O_5$$?

Accepted Answer

Dinitrogen pentoxide

Question 12

What is the molar mass of $$H_2SO_4$$?

Accepted Answer

$$98.0 g/$$mol

Question 13

Which of the following is a binary acid?

Accepted Answer

Hydrochloric acid

Question 14

What is the correct formula for aluminum sulfate?

Accepted Answer

$$Al_2$$($$SO_4)_3$

Question 15

Which of the following best describes the Law of Conservation of Mass?

Accepted Answer

Mass is neither created nor destroyed during a chemical reaction.

Question 16

How many atoms are in $$2.5$$ moles of sodium?

Accepted Answer

$$1.51 	imes 10$$^{24}$$ atoms

Question 17

Which of the following is the correct balanced equation for the reaction of iron(III) chloride with sodium hydroxide?

Accepted Answer

$$FeCl_3 + 3$$NaOH \rightarrow Fe(OH)_3 + 3NaCl$$

Question 18

A compound contains $$40.0 g of $$oxygen and $$10.0 g of $$hydrogen. What is the mass percent of hydrogen in the compound?

Accepted Answer

$$20.0\%$$

Question 19

Which of the following is a molecular compound?

Accepted Answer

$$CO_2$$

Question 20

Which of the following is the correct formula for calcium phosphate?

Accepted Answer

$$Ca_3$$($$PO_4)_2$

Introductory Chemistry Study Guide: Atomic Structure, Chemical Nomenclature, Reactions, and Mole Calculations

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