Q: Write the balanced chemical equation for the reaction of cesium metal with water.

$$2\ \text{Cs}(s) + 2\ \text{H}_2\text{O}(l) \rightarrow 2\ \text{CsOH}(aq) + \text{H}_2(g)$$

Q: A cube of bismuth metal has an edge length of 5.00 cm. Given the density of Bi is 9.808 g/cm$$^3$$ and its molar mass is 209.0 g/mol, how many atoms of Bi are present in the cube?

$$3.53 \times 10$$^{24}$$ atoms

Q: What is the net ionic equation for the reaction of Bi$$_2O$_3(s) $$with dilute nitric acid?

$$\text{Bi}_2\text{O}_3(s) + 6\ \text{H}^+(aq) \rightarrow 2\ \text{Bi}^{3+}(aq) + 3\ \text{H}_2\text{O}(l)$$

Q: Which of the following is the correct balanced equation for the reaction of selenium dioxide with sodium hydroxide?

$$\text{SeO}_2(s) + 2\ \text{NaOH}(aq) \rightarrow \text{Na}_2\text{SeO}_3(aq) + \text{H}_2\text{O}(l)$$

Question 1

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

Accepted Answer

Additional electron shells are added, increasing the distance of the outermost electrons from the nucleus.

Question 2

Given the bonding atomic radii: C = 0.76 Å, S = 1.05 Å, H = 0.31 Å, what is the predicted length of the S—H bond in methyl mercaptan (CH$$_3SH$$)?

Accepted Answer

$$1.36\ 	ext{Å}$$

Question 3

Arrange the following atoms in order of increasing atomic radius: N, O, P, Ge.

Accepted Answer

O \u003c N \u003c P \u003c Ge

Question 4

Which of the following ions is largest in size: S$$^{2-}$$, S, O$$^{2-}$$?

Accepted Answer

S$$^{2-}$$

Question 5

In the isoelectronic series S$$^{2-}$$, Cl$$^-$$, K$$^+$$, Ca$$^{2+}$$, which ion is smallest?

Accepted Answer

Ca$$^{2+}$$

Question 6

Which element has the largest second ionization energy: Na, S, or Ca?

Accepted Answer

Na

Question 7

Which of the following statements about first ionization energies is TRUE?

Accepted Answer

The first ionization energy of O is less than that of N because in O we must pair electrons in the 2p orbitals.

Question 8

What is the electron configuration for Co$$^{3+}$$?

Accepted Answer

[Ar]3d$$^6$$

Question 9

Which of the following oxides is expected to form an acidic solution in water?

Accepted Answer

SO$$_2$$

Question 10

Write the balanced chemical equation for the reaction of cesium metal with water.

Accepted Answer

$$2\ 	ext{Cs}(s) + 2\ 	ext{H}_2	ext{O}(l) ightarrow 2\ 	ext{CsOH}(aq) + 	ext{H}_2(g)$$

Question 11

A cube of bismuth metal has an edge length of 5.00 cm. Given the density of Bi is 9.808 g/cm$$^3$$ and its molar mass is 209.0 g/mol, how many atoms of Bi are present in the cube?

Accepted Answer

$$3.53 	imes 10$$^{24}$$ atoms

Question 12

Which of the following best describes the trend in metallic character as you move down group 5A (15) in the periodic table?

Accepted Answer

Metallic character increases.

Question 13

What is the net ionic equation for the reaction of Bi$$_2O$_3(s) $$with dilute nitric acid?

Accepted Answer

$$	ext{Bi}_2	ext{O}_3(s) + 6\ 	ext{H}^+(aq) ightarrow 2\ 	ext{Bi}^{3+}(aq) + 3\ 	ext{H}_2	ext{O}(l)$$

Question 14

Which of the following best explains why the atomic radius of bismuth is larger than that of antimony?

Accepted Answer

Bismuth has more electron shells, increasing the distance of the outermost electrons from the nucleus.

Question 15

Which of the following is the correct electron configuration for S$$^{2-}$$?

Accepted Answer

[Ne]3s$$^23p$^6$$

Question 16

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

Accepted Answer

It increases.

Question 17

Which of the following is the correct balanced equation for the reaction of selenium dioxide with sodium hydroxide?

Accepted Answer

$$	ext{SeO}_2(s) + 2\ 	ext{NaOH}(aq) ightarrow 	ext{Na}_2	ext{SeO}_3(aq) + 	ext{H}_2	ext{O}(l)$$

Study Guide: Atomic and Ionic Radii, Bond Lengths, Ionization Energies, and Periodic Trends

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