Questions & Answers
Browse all 18 questions from the
Foundational Chemistry Principles study set below.
Each question shows the correct answer — select a study format above to practice interactively.
1
What is the primary reason for the high boiling point of water compared to other molecules of similar molecular weight, such as hydrogen sulfide (H₂S)?
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A
Strong van der Waals forces
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B
Presence of ionic bonds
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C
Extensive hydrogen bonding
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D
High kinetic energy of water molecules
2
Which noble gas is the most abundant in Earth's atmosphere?
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A
Helium (He)
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B
Neon (Ne)
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C
Argon (Ar)
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D
Krypton (Kr)
3
The process by which a solid directly transforms into a gas without passing through the liquid phase is known as:
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A
Evaporation
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B
Condensation
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C
Sublimation
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D
Deposition
4
What fundamental law states that in a chemical reaction, mass is neither created nor destroyed?
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A
Law of Definite Proportions
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B
Law of Multiple Proportions
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C
Law of Conservation of Mass
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D
Avogadro's Law
5
What is the approximate pH of a neutral solution at standard temperature and pressure?
6
Which element has the highest electronegativity?
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A
Oxygen (O)
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B
Chlorine (Cl)
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C
Fluorine (F)
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D
Nitrogen (N)
7
What type of chemical bond involves the sharing of electrons between atoms?
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A
Ionic bond
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B
Metallic bond
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C
Covalent bond
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D
Hydrogen bond
8
The number of protons in the nucleus of an atom is defined as its:
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A
Mass number
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B
Atomic number
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C
Isotope number
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D
Neutron number
9
What is the chemical formula for sulfuric acid?
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A
HCl
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B
HNO₃
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C
H₂SO₄
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D
H₃PO₄
10
Which phenomenon explains why adding salt to water lowers its freezing point?
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A
Osmotic pressure
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B
Boiling point elevation
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C
Freezing point depression
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D
Surface tension
11
What is the most abundant element in the Earth's crust by mass?
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A
Iron (Fe)
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B
Aluminum (Al)
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C
Silicon (Si)
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D
Oxygen (O)
12
What is the state of matter characterized by a definite volume but no definite shape?
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A
Solid
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B
Liquid
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C
Gas
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D
Plasma
13
What term describes a substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change?
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A
Inhibitor
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B
Catalyst
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C
Reactant
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D
Product
14
What is the common name for sodium chloride?
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A
Baking soda
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B
Table salt
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C
Bleach
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D
Vinegar
15
Which of the following is an example of an exothermic reaction?
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A
Melting ice
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B
Photosynthesis
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C
Combustion of wood
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D
Dissolving salt in water
16
What is the SI unit for pressure?
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A
Newton (N)
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B
Joule (J)
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C
Pascal (Pa)
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D
Watt (W)
17
The arrangement of electrons in atomic shells is described by which principle?
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A
Heisenberg Uncertainty Principle
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B
Pauli Exclusion Principle
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C
Aufbau Principle
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D
Hund's Rule
18
Which element is the primary component of natural gas?
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A
Ethane (C₂H₆)
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B
Propane (C₃H₈)
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C
Methane (CH₄)
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D
Butane (C₄H₁₀)
