Question 1

Which of the following is an example of a chemical change?

Accepted Answer

Rusting of iron nails

Question 2

Which statement best describes a physical change?

Accepted Answer

The substance changes state but retains its chemical identity

Question 3

Which unit is most appropriate for measuring the mass of a single atom?

Accepted Answer

Atomic mass unit (amu)

Question 4

A student measures the boiling point of water three times and gets 99.8°C, 99.9°C, and 99.7°C. The accepted value is 100.0°C. Which statement best describes the reliability of these measurements?

Accepted Answer

The measurements are precise but not accurate

Question 5

Which law states that matter is composed of atoms that combine in simple whole-number ratios?

Accepted Answer

Law of Definite Proportions

Question 6

Which quantum number determines the shape of an atomic orbital?

Accepted Answer

Angular momentum quantum number ($l$)

Question 7

What is the electron configuration for a neutral oxygen atom?

Accepted Answer

$1s^2 2s^2 2p^4$

Question 8

Which of the following elements has the highest electronegativity?

Accepted Answer

Fluorine (F)

Question 9

Which type of chemical bond involves the sharing of electron pairs between atoms?

Accepted Answer

Covalent bond

Question 10

Which statement about the periodic table is correct?

Accepted Answer

Elements are arranged by increasing atomic number

Question 11

Which orbital has a spherical shape?

Accepted Answer

$s$ orbital

Question 12

What is the molar mass of water ($H_2O$)?

Accepted Answer

$18.02\ g/mol$

Question 13

Which of the following best explains why metals conduct electricity?

Accepted Answer

Metals have loosely bound valence electrons that can move freely

Question 14

Which molecular shape is predicted for $CO_2$ using VSEPR theory?

Accepted Answer

Linear

Question 15

Which of the following is a consequence of the quantum mechanical model of the atom?

Accepted Answer

Electrons exist in defined energy levels and regions of probability

Question 16

Which of the following is NOT a property of ionic compounds?

Accepted Answer

Malleability

Question 17

A solution is prepared by dissolving 5.00 g of NaCl in enough water to make 250 mL of solution. What is the molarity of the solution? ($M_{NaCl} = 58.44\ g/mol$)

Accepted Answer

$0.342\ M$

Question 18

Which of the following best describes the process of hybridization in valence bond theory?

Accepted Answer

Mixing of atomic orbitals to form new, equivalent hybrid orbitals

Question 19

Which of the following molecules exhibits electron delocalization as described by molecular orbital theory?

Accepted Answer

$O_2$

Question 20

Which of the following is a real-world application of Lewis structures?

Accepted Answer

Predicting the reactivity of drugs used to treat AIDS

General Chemistry: Key Concepts and Chapter Outlines

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