Question 1

Which of the following elements is most likely to have the largest atomic radius?

Accepted Answer

K

Question 2

Which of the following statements best explains why ionization energy increases across a period from left to right?

Accepted Answer

The nuclear charge increases, pulling electrons closer to the nucleus.

Question 3

Given the following ions: $$\mathrm{Na^+}$$, $$\mathrm{Mg$$^{2+}$$}$$, $$\mathrm{Al$$^{3+}$$}$$, and $$\mathrm{K^+}$$, which has the smallest ionic radius?

Accepted Answer

$$\mathrm{Al$$^{3+}$$}$$

Question 4

Which of the following compounds is a binary molecular (covalent) compound?

Accepted Answer

$$\mathrm{CO_2$}$$

Question 5

Which of the following is the correct systematic name for $$\mathrm{Fe_2O_3}$$?

Accepted Answer

Iron(III) oxide

Question 6

Which of the following is a correct balanced equation for the decomposition of calcium carbonate?

Accepted Answer

$$\mathrm{$$CaCO_3$$ \rightarrow CaO + CO_2$}$$

Question 7

Which of the following metals will react with water at room temperature to produce hydrogen gas?

Accepted Answer

Sodium

Question 8

What is the empirical formula for a compound that is 40% sulfur and 60% oxygen by mass?

Accepted Answer

$$\mathrm{SO_2$}$$

Question 9

Which of the following ions is a polyatomic anion?

Accepted Answer

$$\mathrm{SO_4$^{2-}}$$

Question 10

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

Accepted Answer

0.50 mol

Question 11

Which of the following reactions is a double-replacement reaction?

Accepted Answer

$$\mathrm{$$AgNO_3$$ + NaCl \rightarrow AgCl + $$NaNO_3$$}$$

Question 12

Which of the following is the correct electron configuration for a neutral atom of phosphorus (atomic number 15)?

Accepted Answer

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

Question 13

Which of the following is the correct formula for the compound formed between calcium and nitrate?

Accepted Answer

$$\mathrm{Ca(NO_3$)_2}$$

Question 14

Which of the following is a correct balanced equation for the neutralization of hydrochloric acid with sodium hydroxide?

Accepted Answer

$$\mathrm{HCl + NaOH \rightarrow NaCl + H_2O}$$

Question 15

Which of the following elements is a halogen?

Accepted Answer

Chlorine

Question 16

What is the molar mass of $$\mathrm{C_2H_6O} ($$ethanol)?

Accepted Answer

46 g/mol

Question 17

Which of the following is a correct Lewis electron dot structure for magnesium?

Accepted Answer

Mg with two dots

Question 18

Which of the following compounds is insoluble in water according to the solubility rules?

Accepted Answer

$$\mathrm{AgCl}$$

Question 19

A compound has an empirical formula of $$\mathrm{CH_2O}$$ and a molar mass of 180 g/mol. What is its molecular formula?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$}$$

Study Guide: Periodic Table, Chemical Nomenclature, Reactions, and Mole Concept

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