AEPA Chemistry Certification
Examination Questions and Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
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1. What determines the identity of an element?
A. Number of neutrons
B. Number of electrons
C. Number of protons
D. Atomic mass
Correct Answer: C. Number of protons
Rationale: The number of protons is the atomic number and uniquely identifies
each element.
2. Which particle has a negative charge?
A. Proton
B. Neutron
C. Electron
D. Nucleus
Correct Answer: C. Electron
Rationale: Electrons carry a negative electrical charge.
3. What is the SI unit for amount of substance?
,A. Gram
B. Mole
C. Liter
D. Kelvin
Correct Answer: B. Mole
Rationale: The mole is the SI base unit used to measure the amount of a chemical
substance.
4. Which law states that mass is conserved during a chemical reaction?
A. Boyle’s Law
B. Law of Conservation of Mass
C. Charles’s Law
D. Periodic Law
Correct Answer: B. Law of Conservation of Mass
Rationale: Matter is not created or destroyed during chemical reactions.
5. Which type of bond involves sharing electrons?
A. Ionic bond
B. Metallic bond
C. Covalent bond
D. Hydrogen bond
Correct Answer: C. Covalent bond
Rationale: Covalent bonds form when atoms share electron pairs.
6. Which element is a halogen?
A. Sodium
B. Chlorine
,C. Magnesium
D. Neon
Correct Answer: B. Chlorine
Rationale: Chlorine belongs to Group 17, the halogen family.
7. Which state of matter has definite volume but no definite shape?
A. Solid
B. Liquid
C. Gas
D. Plasma
Correct Answer: B. Liquid
Rationale: Liquids maintain their volume but take the shape of their containers.
8. Which equation defines density?
A. Density = mass × volume
B. Density = mass ÷ volume
C. Density = volume ÷ mass
D. Density = mass + volume
Correct Answer: B. Density = mass ÷ volume
Rationale: Density is calculated by dividing mass by volume.
9. Which gas law describes an inverse relationship between pressure and
volume?
A. Boyle’s Law
B. Charles’s Law
C. Avogadro’s Law
D. Dalton’s Law
Correct Answer: A. Boyle’s Law
, Rationale: Boyle’s Law states that pressure increases as volume decreases at
constant temperature.
10. Which value represents a neutral solution at 25°C?
A. pH 2
B. pH 5
C. pH 7
D. pH 12
Correct Answer: C. pH 7
Rationale: A neutral solution has equal concentrations of hydrogen and hydroxide
ions.
11. Which instrument measures mass?
A. Balance
B. Thermometer
C. Burette
D. Pipette
Correct Answer: A. Balance
Rationale: Balances are used to determine the mass of substances.
12. Which change produces a new substance?
A. Melting
B. Freezing
C. Chemical reaction
D. Crushing
Correct Answer: C. Chemical reaction
Rationale: Chemical reactions rearrange atoms to form new substances.
Examination Questions and Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
1. What determines the identity of an element?
A. Number of neutrons
B. Number of electrons
C. Number of protons
D. Atomic mass
Correct Answer: C. Number of protons
Rationale: The number of protons is the atomic number and uniquely identifies
each element.
2. Which particle has a negative charge?
A. Proton
B. Neutron
C. Electron
D. Nucleus
Correct Answer: C. Electron
Rationale: Electrons carry a negative electrical charge.
3. What is the SI unit for amount of substance?
,A. Gram
B. Mole
C. Liter
D. Kelvin
Correct Answer: B. Mole
Rationale: The mole is the SI base unit used to measure the amount of a chemical
substance.
4. Which law states that mass is conserved during a chemical reaction?
A. Boyle’s Law
B. Law of Conservation of Mass
C. Charles’s Law
D. Periodic Law
Correct Answer: B. Law of Conservation of Mass
Rationale: Matter is not created or destroyed during chemical reactions.
5. Which type of bond involves sharing electrons?
A. Ionic bond
B. Metallic bond
C. Covalent bond
D. Hydrogen bond
Correct Answer: C. Covalent bond
Rationale: Covalent bonds form when atoms share electron pairs.
6. Which element is a halogen?
A. Sodium
B. Chlorine
,C. Magnesium
D. Neon
Correct Answer: B. Chlorine
Rationale: Chlorine belongs to Group 17, the halogen family.
7. Which state of matter has definite volume but no definite shape?
A. Solid
B. Liquid
C. Gas
D. Plasma
Correct Answer: B. Liquid
Rationale: Liquids maintain their volume but take the shape of their containers.
8. Which equation defines density?
A. Density = mass × volume
B. Density = mass ÷ volume
C. Density = volume ÷ mass
D. Density = mass + volume
Correct Answer: B. Density = mass ÷ volume
Rationale: Density is calculated by dividing mass by volume.
9. Which gas law describes an inverse relationship between pressure and
volume?
A. Boyle’s Law
B. Charles’s Law
C. Avogadro’s Law
D. Dalton’s Law
Correct Answer: A. Boyle’s Law
, Rationale: Boyle’s Law states that pressure increases as volume decreases at
constant temperature.
10. Which value represents a neutral solution at 25°C?
A. pH 2
B. pH 5
C. pH 7
D. pH 12
Correct Answer: C. pH 7
Rationale: A neutral solution has equal concentrations of hydrogen and hydroxide
ions.
11. Which instrument measures mass?
A. Balance
B. Thermometer
C. Burette
D. Pipette
Correct Answer: A. Balance
Rationale: Balances are used to determine the mass of substances.
12. Which change produces a new substance?
A. Melting
B. Freezing
C. Chemical reaction
D. Crushing
Correct Answer: C. Chemical reaction
Rationale: Chemical reactions rearrange atoms to form new substances.
