General Chemistry I Examination
Questions and Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. Chemistry is the study of:
A. Living organisms only
B. Planets and stars
C. Matter and the changes it undergoes
D. Earthquakes
Answer: C. Matter and the changes it undergoes
Rationale: Chemistry focuses on the composition, properties, and transformations
of matter.
2. Matter is defined as anything that:
A. Produces light
B. Conducts electricity
C. Has mass and occupies space
D. Contains oxygen
Answer: C. Has mass and occupies space
Rationale: All matter has measurable mass and takes up volume.
3. Which of the following is a physical property?
A. Flammability
B. Reactivity with acids
C. Density
D. Ability to rust
,Answer: C. Density
Rationale: Density can be measured without changing the chemical identity of a
substance.
4. Which of the following is a chemical property?
A. Melting point
B. Boiling point
C. Color
D. Flammability
Answer: D. Flammability
Rationale: Flammability describes a substance's ability to undergo combustion, a
chemical change.
5. Which process is a physical change?
A. Burning wood
B. Rusting iron
C. Digestion of food
D. Melting ice
Answer: D. Melting ice
Rationale: Melting changes only the physical state, not the chemical composition.
6. Which process is a chemical change?
A. Freezing water
B. Crushing sugar
C. Boiling ethanol
D. Burning propane
Answer: D. Burning propane
Rationale: Combustion forms new substances, making it a chemical change.
,7. An element is a substance that:
A. Contains two or more atoms
B. Can be separated physically
C. Cannot be broken down by chemical means
D. Contains equal numbers of protons and neutrons
Answer: C. Cannot be broken down by chemical means
Rationale: Elements are the simplest chemical substances.
8. A compound is composed of:
A. One type of atom only
B. Two or more elements chemically combined
C. Two physical mixtures
D. One molecule only
Answer: B. Two or more elements chemically combined
Rationale: Compounds contain elements bonded in fixed proportions.
9. Which is an example of a mixture?
A. Oxygen gas
B. Sodium chloride
C. Water
D. Air
Answer: D. Air
Rationale: Air is a mixture of gases including nitrogen, oxygen, and argon.
10. A homogeneous mixture is also called a:
, A. Suspension
B. Colloid
C. Solution
D. Compound
Answer: C. Solution
Rationale: A solution has a uniform composition throughout.
11. The smallest unit of an element that retains its identity is an:
A. Molecule
B. Compound
C. Atom
D. Ion
Answer: C. Atom
Rationale: Atoms are the fundamental units of elements.
12. The subatomic particle with a positive charge is the:
A. Electron
B. Neutron
C. Proton
D. Photon
Answer: C. Proton
Rationale: Protons carry a +1 charge and are located in the nucleus.
13. The subatomic particle with no electrical charge is the:
A. Electron
B. Proton
C. Neutron
D. Positron
Questions and Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. Chemistry is the study of:
A. Living organisms only
B. Planets and stars
C. Matter and the changes it undergoes
D. Earthquakes
Answer: C. Matter and the changes it undergoes
Rationale: Chemistry focuses on the composition, properties, and transformations
of matter.
2. Matter is defined as anything that:
A. Produces light
B. Conducts electricity
C. Has mass and occupies space
D. Contains oxygen
Answer: C. Has mass and occupies space
Rationale: All matter has measurable mass and takes up volume.
3. Which of the following is a physical property?
A. Flammability
B. Reactivity with acids
C. Density
D. Ability to rust
,Answer: C. Density
Rationale: Density can be measured without changing the chemical identity of a
substance.
4. Which of the following is a chemical property?
A. Melting point
B. Boiling point
C. Color
D. Flammability
Answer: D. Flammability
Rationale: Flammability describes a substance's ability to undergo combustion, a
chemical change.
5. Which process is a physical change?
A. Burning wood
B. Rusting iron
C. Digestion of food
D. Melting ice
Answer: D. Melting ice
Rationale: Melting changes only the physical state, not the chemical composition.
6. Which process is a chemical change?
A. Freezing water
B. Crushing sugar
C. Boiling ethanol
D. Burning propane
Answer: D. Burning propane
Rationale: Combustion forms new substances, making it a chemical change.
,7. An element is a substance that:
A. Contains two or more atoms
B. Can be separated physically
C. Cannot be broken down by chemical means
D. Contains equal numbers of protons and neutrons
Answer: C. Cannot be broken down by chemical means
Rationale: Elements are the simplest chemical substances.
8. A compound is composed of:
A. One type of atom only
B. Two or more elements chemically combined
C. Two physical mixtures
D. One molecule only
Answer: B. Two or more elements chemically combined
Rationale: Compounds contain elements bonded in fixed proportions.
9. Which is an example of a mixture?
A. Oxygen gas
B. Sodium chloride
C. Water
D. Air
Answer: D. Air
Rationale: Air is a mixture of gases including nitrogen, oxygen, and argon.
10. A homogeneous mixture is also called a:
, A. Suspension
B. Colloid
C. Solution
D. Compound
Answer: C. Solution
Rationale: A solution has a uniform composition throughout.
11. The smallest unit of an element that retains its identity is an:
A. Molecule
B. Compound
C. Atom
D. Ion
Answer: C. Atom
Rationale: Atoms are the fundamental units of elements.
12. The subatomic particle with a positive charge is the:
A. Electron
B. Neutron
C. Proton
D. Photon
Answer: C. Proton
Rationale: Protons carry a +1 charge and are located in the nucleus.
13. The subatomic particle with no electrical charge is the:
A. Electron
B. Proton
C. Neutron
D. Positron
