UWF EDF6225 Foundations of ABA – Exams
1 & 2 Complete Practice Bundle
Section I: Matter, Measurement, and Scientific Method (1–20)
1. Which of the following is a pure substance?
A. Air
B. Salt water
C. Gold
D. Brass
Correct Answer: C
Rationale: Gold is an element, which is a pure substance. Air, salt water, and brass are
mixtures.
2. Which of the following is a homogeneous mixture?
A. Sand and water
B. Salt water
C. Oil and water
D. Granite
Correct Answer: B
Rationale: Salt water is a homogeneous mixture (solution) because its composition is
uniform throughout.
3. Which of the following is a chemical change?
A. Melting ice
B. Boiling water
C. Rusting iron
D. Dissolving sugar
Correct Answer: C
Rationale: Rusting iron is a chemical change because a new substance (iron oxide) is
formed.
,4. Which of the following is a physical change?
A. Burning wood
B. Digesting food
C. Cutting paper
D. Baking a cake
Correct Answer: C
Rationale: Cutting paper is a physical change because it does not alter the chemical
composition.
5. How many significant figures are in 0.00340?
A. 2
B. 3
C. 4
D. 5
Correct Answer: B
Rationale: Leading zeros are not significant; 3, 4, and the trailing zero are significant, giving
3 significant figures.
6. How many significant figures are in 1200?
A. 2
B. 3
C. 4
D. Ambiguous
Correct Answer: D
Rationale: Trailing zeros in a whole number without a decimal point are ambiguous.
7. What is the SI unit of mass?
A. Gram
B. Pound
C. Kilogram
D. Ounce
Correct Answer: C
Rationale: The kilogram (kg) is the SI base unit of mass.
,8. What is the SI unit of temperature?
A. Celsius
B. Fahrenheit
C. Kelvin
D. Rankine
Correct Answer: C
Rationale: The kelvin (K) is the SI base unit of temperature.
9. Convert 25°C to Kelvin.
A. 248 K
B. 273 K
C. 298 K
D. 323 K
Correct Answer: C
Rationale: K = °C + 273.15 = 25 + 273 = 298 K.
10. Convert 300 K to Celsius.
A. 27°C
B. 37°C
C. 47°C
D. 57°C
Correct Answer: A
Rationale: °C = K − 273 = 300 − 273 = 27°C.
11. What is the density of a substance with mass 25 g and volume 5 mL?
A. 0.2 g/mL
B. 5 g/mL
C. 20 g/mL
D. 125 g/mL
Correct Answer: B
Rationale: Density = mass/volume = 25/5 = 5 g/mL.
, 12. Which of the following is a chemical property?
A. Density
B. Melting point
C. Flammability
D. Solubility
Correct Answer: C
Rationale: Flammability is a chemical property because it describes how a substance reacts.
13. Which of the following is a physical property?
A. Reactivity with acid
B. Boiling point
C. Combustibility
D. Oxidation
Correct Answer: B
Rationale: Boiling point is a physical property because it does not involve a chemical
change.
14. What is the metric prefix for 10⁻³?
A. Milli
B. Micro
C. Nano
D. Centi
Correct Answer: A
Rationale: Milli (m) = 10⁻³.
15. What is the metric prefix for 10⁶?
A. Kilo
B. Mega
C. Giga
D. Tera
1 & 2 Complete Practice Bundle
Section I: Matter, Measurement, and Scientific Method (1–20)
1. Which of the following is a pure substance?
A. Air
B. Salt water
C. Gold
D. Brass
Correct Answer: C
Rationale: Gold is an element, which is a pure substance. Air, salt water, and brass are
mixtures.
2. Which of the following is a homogeneous mixture?
A. Sand and water
B. Salt water
C. Oil and water
D. Granite
Correct Answer: B
Rationale: Salt water is a homogeneous mixture (solution) because its composition is
uniform throughout.
3. Which of the following is a chemical change?
A. Melting ice
B. Boiling water
C. Rusting iron
D. Dissolving sugar
Correct Answer: C
Rationale: Rusting iron is a chemical change because a new substance (iron oxide) is
formed.
,4. Which of the following is a physical change?
A. Burning wood
B. Digesting food
C. Cutting paper
D. Baking a cake
Correct Answer: C
Rationale: Cutting paper is a physical change because it does not alter the chemical
composition.
5. How many significant figures are in 0.00340?
A. 2
B. 3
C. 4
D. 5
Correct Answer: B
Rationale: Leading zeros are not significant; 3, 4, and the trailing zero are significant, giving
3 significant figures.
6. How many significant figures are in 1200?
A. 2
B. 3
C. 4
D. Ambiguous
Correct Answer: D
Rationale: Trailing zeros in a whole number without a decimal point are ambiguous.
7. What is the SI unit of mass?
A. Gram
B. Pound
C. Kilogram
D. Ounce
Correct Answer: C
Rationale: The kilogram (kg) is the SI base unit of mass.
,8. What is the SI unit of temperature?
A. Celsius
B. Fahrenheit
C. Kelvin
D. Rankine
Correct Answer: C
Rationale: The kelvin (K) is the SI base unit of temperature.
9. Convert 25°C to Kelvin.
A. 248 K
B. 273 K
C. 298 K
D. 323 K
Correct Answer: C
Rationale: K = °C + 273.15 = 25 + 273 = 298 K.
10. Convert 300 K to Celsius.
A. 27°C
B. 37°C
C. 47°C
D. 57°C
Correct Answer: A
Rationale: °C = K − 273 = 300 − 273 = 27°C.
11. What is the density of a substance with mass 25 g and volume 5 mL?
A. 0.2 g/mL
B. 5 g/mL
C. 20 g/mL
D. 125 g/mL
Correct Answer: B
Rationale: Density = mass/volume = 25/5 = 5 g/mL.
, 12. Which of the following is a chemical property?
A. Density
B. Melting point
C. Flammability
D. Solubility
Correct Answer: C
Rationale: Flammability is a chemical property because it describes how a substance reacts.
13. Which of the following is a physical property?
A. Reactivity with acid
B. Boiling point
C. Combustibility
D. Oxidation
Correct Answer: B
Rationale: Boiling point is a physical property because it does not involve a chemical
change.
14. What is the metric prefix for 10⁻³?
A. Milli
B. Micro
C. Nano
D. Centi
Correct Answer: A
Rationale: Milli (m) = 10⁻³.
15. What is the metric prefix for 10⁶?
A. Kilo
B. Mega
C. Giga
D. Tera
