Fall Final 23 (Honors)

A scientific artist is assigned the task of drawing an illustration depicting particles of a liquid. Which of the following best describes the drawing the illustrator should make?

• A. a drawing depicting spheres moving randomly and far apart

• B. a drawing depicting spheres closely packed and vibrating in place

• C. a drawing depicting spheres moving randomly and vibrating in place

• D. a drawing depicting spheres sliding past one another and fairly close together

Which two events must occur for condensation to happen?

• A. Molecules in the gaseous state must gain energy, and the molecules must move closer together.

• B. Molecules in the gaseous state must lose energy, and the molecules must move farther apart.

• C. Molecules in the gaseous state must gain energy, and the molecules must move farther apart.

• D. Molecules in the gaseous state must lose energy, and the molecules must move closer together.

A student heats a solid for 30 seconds. The solid does not melt, but its temperature rises from 20°C to 25°C. What is happening to the kinetic energy of the molecules in the solid?

• A. The kinetic energy is remaining constant.

• B. The kinetic energy is decreasing.

• C. The kinetic energy is increasing.

• D. The kinetic energy vanishes.

A chemist examines two compounds. Both are clear, odorless liquids. Which of the following would not indicate that a chemical change has occurred when the two compounds are combined?

• A. The product remains clear but bubbles form.

• B. The product remains odorless but turns blue.

• C. The product remains clear but a new smell is apparent.

• D. The product is also clear and odorless.

Which reaction would result in a change in odor, indicating a chemical change has occurred?

• A. boiling water

• B. frying an egg

• C. slicing an apple

• D. mashing a banana

What in this image indicates a chemical change has occurred?

• A. the tablets falling to the bottom

• B. bubbles rising from the tablets

• C. a cloudy solution forming

• D. the size of the tablets changing

At 25°C, what happens to the pressure of a gas in a sealed container when you compress the gas into a smaller volume?

• A. The pressure increases.

• B. The pressure decreases.

• C. The pressure remains constant.

• D. The pressure can either increase or decrease, depending on the magnitude of the volume change.

The combustion of propane occurs when propane interacts with oxygen gas to produce water and carbon dioxide. If 6 moles of propane react at 373 K in a volume of 2.5 L, what is the resulting pressure in the cylinder from the CO(g) produced in the reaction?

• A. 24 atm

• B. 48 atm

• C. 73 atm

• D. 97 atm

The atomic number of lead is 82. Its mass number is 207. How many protons, neutrons, and electrons does this atom of lead contain?

• A. 207 protons, no neutrons, and 207 electrons

• B. 125 protons, 82 neutrons, and 125 electrons

• C. 82 protons, 125 neutrons, and 82 electrons

• D. 82 protons, 207 neutrons, and 82 electrons

The atomic mass of silver is 107.87. Silver has two very abundant isotopes occurring in almost equal proportions, along with a number of very rare isotopes. Which are most likely to be the atomic masses of the two most abundant isotopes of silver?

• A. 105.91, 106.91

• B. 105.91. 108.90

• C. 106.91, 108.90

• D. 106.91, 109.91