1|Page SUCCESS!!!
,MODULE 1 PRACTICE QUESTIONS
Q1. Convert 845.3 to exponential form and explain your answer.
Answer: 8.453 × 10²
845.3 is larger than 1, so the exponent is positive. Move the decimal 2 places to the left: 8.453 × 10²
Q2. Convert 3.21 × 10⁻⁵ to ordinary form and explain your answer.
Answer: 0.0000321
The exponent is negative, so the number is smaller than 1. Move the decimal 5 places to the left:
0.0000321
Q3. 24.6 grams = ? kilograms. Show your work.
Answer: 0.0246 kg
24.6 g × (1 kg / 1000 g) = 0.0246 kg
Q4. 6.3 ft = ? inches. Show your work.
Answer: 75.6 inches
6.3 ft × (12 in / 1 ft) = 75.6 inches
Q5. Convert 28°C to Kelvin.
Answer: 301 K
°C → K: add 273. 28 + 273 = 301 K
Q6. Convert 158°F to Celsius.
Answer: 70°C
°F → °C: (°F - 32) ÷ 1.8. (158 - 32) ÷ 1.8 = 126 ÷ 1.8 = 70°C
Q7. Convert 343 K to Fahrenheit.
Answer: 158°F
K → °C → °F. 343 - 273 = 70°C. (70 × 1.8) + 32 = 126 + 32 = 158°F
Q8. Calculate the mass of an 18.6 mL sample of freon with a density of 1.49 g/mL.
Answer: 27.7 g
Mass = Density × Volume = 1.49 g/mL × 18.6 mL = 27.7 g (3 sig figs)
2|Page SUCCESS!!!
,Q9. Calculate the density of crude oil if 26.3 g occupies 30.5 mL.
Answer: 0.862 g/mL
Density = Mass / Volume = 26.3 g / 30.5 mL = 0.862 g/mL (3 sig figs)
Q10. How many significant figures are in 3.0600?
Answer: 5 significant figures
3.0600 has 5 sig figs: the 3, the zero between 3 and 6, the 6, and the two trailing zeros after the decimal
Q11. How many significant figures are in 0.0151?
Answer: 3 significant figures
0.0151 has 3 sig figs: 1, 5, and 1. The leading zeros are NOT significant
Q12. Calculate 3.0600 ÷ 0.0151 and report the answer with the correct number of significant
figures.
Answer: 203
*3.0600 ÷ 0.0151 = 202.649... The divisor (0.0151) has 3 sig figs, so the answer should have 3 sig figs:
203*
Q13. Define accuracy.
Answer: Accuracy is the nearness of the measured value to the actual value of the quantity being
measured
Q14. Define precision.
Answer: Precision is the degree of agreement between several measured values of a quantity
Q15. What is the difference between mass and weight?
Answer: Mass is a measure of the amount of matter in an object and is independent of location. Weight is
a measure of the gravitational force acting on an object and depends on location
Q16. Identify the following as a physical or chemical change: melting ice.
Answer: Physical change
Melting is a reversible change; the substance (water) changes state but its chemical composition remains
the same
3|Page SUCCESS!!!
, Q17. Identify the following as a physical or chemical change: burning wood.
Answer: Chemical change
Burning produces new substances (ash, smoke, gases) and is irreversible
Q18. What is the atomic number of an element?
Answer: The atomic number is the number of protons in the nucleus of an atom (and also the number of
electrons in a neutral atom)
Q19. What is an isotope?
Answer: Isotopes are atoms of the same element that have different numbers of neutrons, and therefore
different mass numbers
Q20. What is the charge of an ion?
Answer: Ionic charge = protons - electrons
MODULE 2: PERIODIC TABLE & ATOMIC STRUCTURE
Key Concepts
• Periodic Trends:
o Atomic Radius: Increases down a group (more electron shells) and to the left across a
period (less nuclear pull)
o Ionization Energy: Increases up a group and to the right across a period
o Electronegativity: Increases up a group and to the right across a period
• Electron Configuration: Write both full configurations and noble gas shorthand
• Quantum Theory: Wave nature of light is supported by optical phenomena
(reflection/refraction), interference patterns from light passing through narrow slits, and
Maxwell's theory of electromagnetic radiation
• Element Symbols: Know common element symbols (Sb = Antimony, Pb = Lead, As = Arsenic,
Mn = Manganese, Ba = Barium, Hg = Mercury, Be = Beryllium, Bi = Bismuth, Ni = Nickel, Sr =
Strontium, F = Fluorine, S = Sulfur, Au = Gold, Sn = Tin, Ti = Titanium, W = Tungsten, Fe =
Iron)
MODULE 2 PRACTICE QUESTIONS
4|Page SUCCESS!!!
,MODULE 1 PRACTICE QUESTIONS
Q1. Convert 845.3 to exponential form and explain your answer.
Answer: 8.453 × 10²
845.3 is larger than 1, so the exponent is positive. Move the decimal 2 places to the left: 8.453 × 10²
Q2. Convert 3.21 × 10⁻⁵ to ordinary form and explain your answer.
Answer: 0.0000321
The exponent is negative, so the number is smaller than 1. Move the decimal 5 places to the left:
0.0000321
Q3. 24.6 grams = ? kilograms. Show your work.
Answer: 0.0246 kg
24.6 g × (1 kg / 1000 g) = 0.0246 kg
Q4. 6.3 ft = ? inches. Show your work.
Answer: 75.6 inches
6.3 ft × (12 in / 1 ft) = 75.6 inches
Q5. Convert 28°C to Kelvin.
Answer: 301 K
°C → K: add 273. 28 + 273 = 301 K
Q6. Convert 158°F to Celsius.
Answer: 70°C
°F → °C: (°F - 32) ÷ 1.8. (158 - 32) ÷ 1.8 = 126 ÷ 1.8 = 70°C
Q7. Convert 343 K to Fahrenheit.
Answer: 158°F
K → °C → °F. 343 - 273 = 70°C. (70 × 1.8) + 32 = 126 + 32 = 158°F
Q8. Calculate the mass of an 18.6 mL sample of freon with a density of 1.49 g/mL.
Answer: 27.7 g
Mass = Density × Volume = 1.49 g/mL × 18.6 mL = 27.7 g (3 sig figs)
2|Page SUCCESS!!!
,Q9. Calculate the density of crude oil if 26.3 g occupies 30.5 mL.
Answer: 0.862 g/mL
Density = Mass / Volume = 26.3 g / 30.5 mL = 0.862 g/mL (3 sig figs)
Q10. How many significant figures are in 3.0600?
Answer: 5 significant figures
3.0600 has 5 sig figs: the 3, the zero between 3 and 6, the 6, and the two trailing zeros after the decimal
Q11. How many significant figures are in 0.0151?
Answer: 3 significant figures
0.0151 has 3 sig figs: 1, 5, and 1. The leading zeros are NOT significant
Q12. Calculate 3.0600 ÷ 0.0151 and report the answer with the correct number of significant
figures.
Answer: 203
*3.0600 ÷ 0.0151 = 202.649... The divisor (0.0151) has 3 sig figs, so the answer should have 3 sig figs:
203*
Q13. Define accuracy.
Answer: Accuracy is the nearness of the measured value to the actual value of the quantity being
measured
Q14. Define precision.
Answer: Precision is the degree of agreement between several measured values of a quantity
Q15. What is the difference between mass and weight?
Answer: Mass is a measure of the amount of matter in an object and is independent of location. Weight is
a measure of the gravitational force acting on an object and depends on location
Q16. Identify the following as a physical or chemical change: melting ice.
Answer: Physical change
Melting is a reversible change; the substance (water) changes state but its chemical composition remains
the same
3|Page SUCCESS!!!
, Q17. Identify the following as a physical or chemical change: burning wood.
Answer: Chemical change
Burning produces new substances (ash, smoke, gases) and is irreversible
Q18. What is the atomic number of an element?
Answer: The atomic number is the number of protons in the nucleus of an atom (and also the number of
electrons in a neutral atom)
Q19. What is an isotope?
Answer: Isotopes are atoms of the same element that have different numbers of neutrons, and therefore
different mass numbers
Q20. What is the charge of an ion?
Answer: Ionic charge = protons - electrons
MODULE 2: PERIODIC TABLE & ATOMIC STRUCTURE
Key Concepts
• Periodic Trends:
o Atomic Radius: Increases down a group (more electron shells) and to the left across a
period (less nuclear pull)
o Ionization Energy: Increases up a group and to the right across a period
o Electronegativity: Increases up a group and to the right across a period
• Electron Configuration: Write both full configurations and noble gas shorthand
• Quantum Theory: Wave nature of light is supported by optical phenomena
(reflection/refraction), interference patterns from light passing through narrow slits, and
Maxwell's theory of electromagnetic radiation
• Element Symbols: Know common element symbols (Sb = Antimony, Pb = Lead, As = Arsenic,
Mn = Manganese, Ba = Barium, Hg = Mercury, Be = Beryllium, Bi = Bismuth, Ni = Nickel, Sr =
Strontium, F = Fluorine, S = Sulfur, Au = Gold, Sn = Tin, Ti = Titanium, W = Tungsten, Fe =
Iron)
MODULE 2 PRACTICE QUESTIONS
4|Page SUCCESS!!!
