Question 1

A bronze statue acquires a green coating with time. This is an example of which type of chemical change?

Accepted Answer

Chemical change due to corrosion

Question 2

Which of the following is a pure substance?

Accepted Answer

Methane gas

Question 3

A sample contains 5.25 mg of krypton atoms. If the molar mass of krypton is 83.8 g/mol, how many moles of krypton are present?

Accepted Answer

$$6.26 	imes 10$$^{-5}$$ mol

Question 4

A 1.446 g sample of potassium reacts with 1.811 g chlorine to form potassium chloride as the only product. What is the mass of potassium chloride formed?

Accepted Answer

$$2.77 g$$

Question 5

Which quantum numbers are impossible for an electron in an atom?

Accepted Answer

$$n=2, l=2, m_l=0, m_s=+\frac{1}{2}$$

Question 6

Which element has the lowest atomic number with a filled 3d subshell?

Accepted Answer

Zinc ($$Z=30)$$

Question 7

Which of the following electron configurations does NOT fulfill the Pauli Exclusion Principle?

Accepted Answer

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

Question 8

Which of the following elements has the highest first ionization energy?

Accepted Answer

F

Question 9

Arrange the following elements in order of increasing atomic radius: Li, K, Na, Rb, Cs.

Accepted Answer

Li \u003c Na \u003c K \u003c Rb \u003c Cs

Question 10

Which of the following compounds is polar?

Accepted Answer

HF

Question 11

Calculate the lattice energy of CaO given the following data: $$\Delta H_{f}(CaO) = -635.5 kJ/$$mol, $$\Delta H_{a}(Ca) = 172 kJ/$$mol, $$\Delta H_{a}(O) = 249 kJ/$$mol, $$IE_1(Ca) = 590$ kJ/mol, IE_2$(Ca) = 1145 kJ/$$mol, $$EA_1(O) = -141$ kJ/mol, EA_2$(O) = 781.4 kJ/$$mol.

Accepted Answer

$$-3414 kJ/$$mol

Question 12

Which statement is TRUE regarding the electron affinity of halogens?

Accepted Answer

Halogens have high electron affinity because they readily accept electrons to achieve noble gas configuration.

Question 13

Which of the following ions has the largest ionic radius?

Accepted Answer

F$$^{-}$$

Question 14

Which of the following statements about the periodic trends is correct?

Accepted Answer

Ionization energy decreases down a group.

Question 15

Which of the following electron configurations represents a transition metal?

Accepted Answer

$$1s^2$$ $$2s^2$$ $$2p^6$$ $$3s^2$$ $$3p^6$$ $$3d^5$$ $$4s^1$$

Question 16

A vinegar that is 5.0 mass percent CH$$_3$$COOH reacts with sodium bicarbonate, producing sodium acetate, carbon dioxide, and water. How many grams of carbon dioxide are produced when 50.0 mL of this vinegar reacts with excess sodium bicarbonate? (Density of vinegar = 1.01 g/mL)

Accepted Answer

$$2.50 g$$

Question 17

Which of the following best explains why the second ionization energy of Li is much higher than the first?

Accepted Answer

The second electron is removed from a more stable, closed shell.

Question 18

Which of the following compounds is most ionic?

Accepted Answer

CaCl$$_2$$

Question 19

Which of the following is the correct ground-state electron configuration for sulfur?

Accepted Answer

$$1s^2$$ $$2s^2$$ $$2p^6$$ $$3s^2$$ $$3p^4$$

General Chemistry Study Guide: Atomic Structure, Periodicity, and Ionic Bonding

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