Question 1

Which group of elements is characterized by very low reactivity and exists as single atom gases at room temperature?

Accepted Answer

Group 8A (noble gases)

Question 2

What is the balanced equation for the combustion of methane, a process that occurs during cellular respiration?

Accepted Answer

$$\mathrm{CH_4$(g) + 2O_2(g) \rightarrow CO_2$(g) + 2H_2O(l) + heat}$$

Question 3

Which of the following statements best explains why alkali metals react violently with water?

Accepted Answer

They have low ionization energies and easily lose their single valence electron.

Question 4

In a single displacement reaction, which metal will displace copper from copper(II) sulfate solution?

Accepted Answer

Zinc

Question 5

Which of the following ions is isoelectronic with neon ($$\mathrm{Ne}$$)?

Accepted Answer

$$\mathrm{Na^+}$$

Question 6

What is the net ionic equation for the reaction between sodium chloride and silver nitrate in aqueous solution?

Accepted Answer

$$\mathrm{Cl^-(aq) + Ag^+(aq) \rightarrow AgCl(s)}$$

Question 7

Which element has the highest electronegativity according to the periodic table?

Accepted Answer

Fluorine

Question 8

What is the correct order of increasing atomic radius for the following elements: Cl, Na, Al, Mg?

Accepted Answer

Cl, Al, Mg, Na

Question 9

Which of the following reactions is a decomposition reaction?

Accepted Answer

$$\mathrm{$$CaCO_3$$(s) \xrightarrow{\Delta} CaO(s) + CO_2$(g)}$$

Question 10

Which of the following best describes the trend in ionization energy across a period from left to right?

Accepted Answer

Ionization energy increases due to increasing effective nuclear charge and decreasing atomic radius.

Question 11

Which of the following is the correct net ionic equation for the neutralization reaction between hydrochloric acid and sodium hydroxide?

Accepted Answer

$$\mathrm{H^+(aq) + OH^-(aq) \rightarrow H_2O(l)}$$

Question 12

Which of the following best explains why the ionic radius of $$\mathrm{F^-} is $$larger than that of $$\mathrm{F}$$?

Accepted Answer

Adding an electron increases electron-electron repulsion and the size of the electron cloud.

Question 13

Which of the following is a correct example of a halogen displacement reaction?

Accepted Answer

$$\mathrm{Cl_2$(g) + 2NaBr(aq) \rightarrow 2NaCl(aq) + Br_2$(l)}$$

Question 14

Which of the following ions has the smallest ionic radius among the isoelectronic species $$\mathrm{F^-}$$, $$\mathrm{Na^+}$$, and $$\mathrm{Mg$$^{2+}$$}$$?

Accepted Answer

$$\mathrm{Mg$$^{2+}$$}$$

Question 15

Which of the following is a correct example of a precipitation reaction?

Accepted Answer

$$\mathrm{NaCl(aq) + $$AgNO_3$$(aq) \rightarrow $$NaNO_3$$(aq) + AgCl(s)}$$

Question 16

Which of the following best describes the trend in atomic radius down a group?

Accepted Answer

Atomic radius increases due to electrons being added to higher principal quantum number shells.

Question 17

Which of the following is the correct oxidation half-reaction for the reaction $$\mathrm{Zn(s) + Cu$$^{2+}$$(aq) \rightarrow Zn$$^{2+}$$(aq) + Cu(s)}$$?

Accepted Answer

$$\mathrm{Zn(s) \rightarrow Zn$$^{2+}$$(aq) + 2e^-}$$

Question 18

Which of the following best describes the difference between electron affinity and electronegativity?

Accepted Answer

Electron affinity is experimentally measurable for isolated atoms; electronegativity is an estimated value for atoms in chemical bonds.

Periodicity and Chemical Reactions: Structure, Trends, and Types of Reactions

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