Unit 4 of 5
Study guide for CLEP CLEP Natural Sciences — Unit 4: Chemistry Fundamentals. Practice questions, key concepts, and exam tips.
35
Practice Questions
14
Flashcards
4
Key Topics
Try these 5 questions from this unit. Sign up for full access to all 35.
What is the primary function of the ozone layer?
To regulate Earth's temperature
To protect the Earth from ultraviolet radiation
To maintain atmospheric pressure
To facilitate photosynthesis
To control weather patterns
Answer: B — To protect the Earth from ultraviolet radiation is correct because ozone absorbs UV radiation, protecting life..
Which of the following is an example of a homogeneous mixture?
Oil and water
Salt and sand
Alcohol and water
Sugar and starch
Iron and sulfur
Answer: C — Alcohol and water is correct because alcohol and water form a uniform solution..
What type of reaction occurs when an element displaces another element from a compound?
Synthesis reaction
Decomposition reaction
Replacement reaction
Combustion reaction
Neutralization reaction
Answer: C — Replacement reaction is correct because one element replaces another in a compound, unlike synthesis which forms a new compound.
Which type of bond involves the transfer of electrons?
Covalent bond
Ionic bond
Hydrogen bond
Electrostatic bond
Van der Waals bond
Answer: B — Ionic bond is correct because ionic bonds involve electron transfer..
What is the term for the minimum energy required for a chemical reaction to occur?
Activation energy
Reaction energy
Bond energy
Potential energy
Kinetic energy
Answer: A — Activation energy is correct because activation energy is the minimum energy required, not potential energy.
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