StraighterLine Chemistry Final Exam SCRIPT
2026/2027 WITH EXPERT-VERIFIED ANSWERS
RATED A+
• Which of the following is a tentative explanation for a set of observations?
Select one:
a. Law
b. Hypothesis
c. Theory
d. Phenomena
e. Prediction -✓✓ b. Hypothesis
• If a liquid contains 60% sugar and 40% water throughout its composition then
what is it called?
Select one:
a. Solute
b. Compound
c. Homogeneous mixture
d. Heterogeneous mixture
e. Solvent -✓✓ c. Homogeneous mixture
• Which of the following does not have a uniform composition throughout?
Select one:
a. Element
b. Compound
c. Homogeneous mixture
,d. Heterogeneous mixture
e. Solvent -✓✓ d. Heterogeneous mixture
• Which one of these represents a physical change?
Select one:
a. Water, when heated, forms steam.
b. Bleach turns hair yellow.
c. Sugar, when heated, becomes brown.
d. Milk turns sour.
e. Apples, when exposed to air, turn brown. -✓✓ a. Water, when heated, forms
steam.
• How many micrograms are in 65.3 kg?
Select one:
a. 0.653 μg
b. 6.53 × 107 μg
c. 6.53 × 104 μg
d. 6.53 × 10-8 μg
e. 6.53 × 1010 μg -✓✓ e. 6.53 × 1010 μg
• A smart phone has dimensions of 4.9 inches (height), 2.3 inches (width) and 8.0
millimeters (depth). What is the volume of the smart phone in cubic centimeters?
(1 in = 2.54 cm)
Select one:
a. 58 cm3
b. 1.7 x 105 cm3
,c. 90 cm3
d. 3.4 cm3
e. 34 cm3 -✓✓ a. 58 cm3
• Given that 1 inch = 2.54 cm, 1.00 cm3 is equal to
Select one:
a. 16.4 in3
b. 6.45 in3
c. 0.394 in3
d. 0.155 in3
e. 0.0610 in3 -✓✓ e. 0.0610 in3
• What terms defines a mass which is exactly equal to 1/12 the mass of one carbon-
12 atom?
Select one:
a. Isotope number
b. Mass number
c. Mass-to-charge ratio
d. Atomic number
e. Atomic mass unit -✓✓ e. Atomic mass unit
• How many neutrons are there in an atom of lead whose mass number is 208?
Select one:
, a. 82
b. 126
c. 208
d. 290
e. none of them -✓✓ b. 126
• Which of these elements is chemically similar to magnesium?
Select one:
a. Sulfur
b. Calcium
c. Iron
d. Nickel
e. Potassium -✓✓ b. Calcium
• C(graphite) and C(diamond) are examples of:
Select one:
a. isotopes of carbon.
b. allotropes of carbon.
c. the law of definite proportions.
d. different carbon ions. -✓✓ b. allotropes of carbon.
• The 80Br- ion has
2026/2027 WITH EXPERT-VERIFIED ANSWERS
RATED A+
• Which of the following is a tentative explanation for a set of observations?
Select one:
a. Law
b. Hypothesis
c. Theory
d. Phenomena
e. Prediction -✓✓ b. Hypothesis
• If a liquid contains 60% sugar and 40% water throughout its composition then
what is it called?
Select one:
a. Solute
b. Compound
c. Homogeneous mixture
d. Heterogeneous mixture
e. Solvent -✓✓ c. Homogeneous mixture
• Which of the following does not have a uniform composition throughout?
Select one:
a. Element
b. Compound
c. Homogeneous mixture
,d. Heterogeneous mixture
e. Solvent -✓✓ d. Heterogeneous mixture
• Which one of these represents a physical change?
Select one:
a. Water, when heated, forms steam.
b. Bleach turns hair yellow.
c. Sugar, when heated, becomes brown.
d. Milk turns sour.
e. Apples, when exposed to air, turn brown. -✓✓ a. Water, when heated, forms
steam.
• How many micrograms are in 65.3 kg?
Select one:
a. 0.653 μg
b. 6.53 × 107 μg
c. 6.53 × 104 μg
d. 6.53 × 10-8 μg
e. 6.53 × 1010 μg -✓✓ e. 6.53 × 1010 μg
• A smart phone has dimensions of 4.9 inches (height), 2.3 inches (width) and 8.0
millimeters (depth). What is the volume of the smart phone in cubic centimeters?
(1 in = 2.54 cm)
Select one:
a. 58 cm3
b. 1.7 x 105 cm3
,c. 90 cm3
d. 3.4 cm3
e. 34 cm3 -✓✓ a. 58 cm3
• Given that 1 inch = 2.54 cm, 1.00 cm3 is equal to
Select one:
a. 16.4 in3
b. 6.45 in3
c. 0.394 in3
d. 0.155 in3
e. 0.0610 in3 -✓✓ e. 0.0610 in3
• What terms defines a mass which is exactly equal to 1/12 the mass of one carbon-
12 atom?
Select one:
a. Isotope number
b. Mass number
c. Mass-to-charge ratio
d. Atomic number
e. Atomic mass unit -✓✓ e. Atomic mass unit
• How many neutrons are there in an atom of lead whose mass number is 208?
Select one:
, a. 82
b. 126
c. 208
d. 290
e. none of them -✓✓ b. 126
• Which of these elements is chemically similar to magnesium?
Select one:
a. Sulfur
b. Calcium
c. Iron
d. Nickel
e. Potassium -✓✓ b. Calcium
• C(graphite) and C(diamond) are examples of:
Select one:
a. isotopes of carbon.
b. allotropes of carbon.
c. the law of definite proportions.
d. different carbon ions. -✓✓ b. allotropes of carbon.
• The 80Br- ion has
