uncw chm 101 exam 1 Questions and
answers rated A+ 2026
Which diagram best represents a heterogeneous mixture of gaseous hydrogen and liquid bromine? -
correct answer ✔b.
Methanol has a molecular formula of CH4O. At room temperature and atmospheric pressure, methanol
is a clear liquid. Based on this information, which of the following statements is also true? a. Methanol is
a compound. b. Methanol can be classified as a mixture. c. Methanol is a solution. d. Oxygen can be
separated from methanol by distillation. - correct answer ✔a. methanol is a compound
Which of the following is/are chemical properties of copper?
i. turns green when exposed to air
ii. has a reddish-brown color
iii. changes from a solid to a liquid at 1085 ºC - correct answer ✔a. turns green when exposed to air
complete the equation with the correct number of significant figures
21.2 cm + 0.67 cm = __ - correct answer ✔21.9 cm
A cube of copper has a mass of 25 kg. The density of copper is 8.94 g/cm3 . What is the length of each
side of this cube? - correct answer ✔14 cm
Most of the alpha particles in Rutherford's gold foil experiment pass through the foil. Some of the alpha
particles fail to pass through the foil because:
a. most of the gold atom is empty space.
b. the positive charge spread throughout the gold atom is not able to alter the pathway of the alpha
particle.
answers rated A+ 2026
Which diagram best represents a heterogeneous mixture of gaseous hydrogen and liquid bromine? -
correct answer ✔b.
Methanol has a molecular formula of CH4O. At room temperature and atmospheric pressure, methanol
is a clear liquid. Based on this information, which of the following statements is also true? a. Methanol is
a compound. b. Methanol can be classified as a mixture. c. Methanol is a solution. d. Oxygen can be
separated from methanol by distillation. - correct answer ✔a. methanol is a compound
Which of the following is/are chemical properties of copper?
i. turns green when exposed to air
ii. has a reddish-brown color
iii. changes from a solid to a liquid at 1085 ºC - correct answer ✔a. turns green when exposed to air
complete the equation with the correct number of significant figures
21.2 cm + 0.67 cm = __ - correct answer ✔21.9 cm
A cube of copper has a mass of 25 kg. The density of copper is 8.94 g/cm3 . What is the length of each
side of this cube? - correct answer ✔14 cm
Most of the alpha particles in Rutherford's gold foil experiment pass through the foil. Some of the alpha
particles fail to pass through the foil because:
a. most of the gold atom is empty space.
b. the positive charge spread throughout the gold atom is not able to alter the pathway of the alpha
particle.
