Question 1

Which of the following elements is classified as a metalloid and is located in the p-block of the periodic table?

Accepted Answer

Silicon (Si)

Question 2

Which of the following electron configurations represents a noble gas?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^6$$

Question 3

Which of the following ions is isoelectronic with argon ($$Ar$$)?

Accepted Answer

$$Ca^{2+}$$

Question 4

Which element has the highest first ionization energy among the following?

Accepted Answer

Fluorine (F)

Question 5

Arrange the following bonds in order of increasing bond strength: single, double, triple.

Accepted Answer

Single \u003c Double \u003c Triple

Question 6

Which of the following statements about the effective nuclear charge ($$Z_{eff}) is $$correct?

Accepted Answer

$$Z_{eff}$$ increases across a period due to increased nuclear charge and relatively constant shielding.

Question 7

Which of the following elements forms a cation with a fixed charge of $$+3$$?

Accepted Answer

Aluminum (Al)

Question 8

What is the correct formula for the compound named 'copper(II) sulfate'?

Accepted Answer

$$CuSO_4$$

Question 9

A sample of magnesium chloride ($$MgCl_2) $$contains $$4.00$$ grams of magnesium. How many moles of chloride ions are present?

Accepted Answer

0.33 moles

Question 10

Which of the following molecules has a trigonal planar molecular geometry according to VSEPR theory?

Accepted Answer

$$BF_3$$

Question 11

Which of the following compounds is a hydrate?

Accepted Answer

$$CuSO_4$$\cdot 5H_2O$$

Question 12

Which of the following statements best describes paramagnetism?

Accepted Answer

A substance with unpaired electrons that is attracted to a magnetic field.

Question 13

Which of the following is the correct chemical equation for the second ionization energy of sodium ($$Na$$)?

Accepted Answer

$$Na^{+}(g$$) \rightarrow $$Na^{2+}(g$$) + $$e^{-}$$

Question 14

Which of the following molecules is nonpolar, despite having polar bonds?

Accepted Answer

$$CO_2$$

Question 15

Which of the following elements has the largest atomic radius?

Accepted Answer

Potassium (K)

Question 16

What is the percent composition by mass of oxygen in water ($$H_2O$$)? (Molar mass of $$H_2O is$$ $$18.02\ g/mol)$$

Accepted Answer

88.8%

Question 17

Which of the following is an exception to the octet rule?

Accepted Answer

$$BF_3$$

Question 18

Which of the following polyatomic ions has a charge of $$-2$$?

Accepted Answer

$$SO_4$$^{2-}$$

Question 19

Which of the following elements exists as a diatomic molecule in its natural state?

Accepted Answer

Nitrogen (N$$_2)$$

Question 20

A compound contains 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen by mass. What is its empirical formula?

Accepted Answer

$$CH_2O$$

General Chemistry Study Guide: Periodic Properties, Molecules & Compounds, and Chemical Bonding (Chapters 3-5)

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