Chemistry Final Exam

Select the correct answer. Which is an example of a solution?

• flour and water

• sand and water

• salt and water

• oil and water

• ice and water

Select the correct answer. Dry ice, or solid carbon dioxide, has the molecular formula CO₂. How should you classify it?

• element

• compound

• mixture

• colloid

• suspension

Tags

NGSS.MS-PS1-1

Select the correct answer. Which statement is true of a chemical change?

• It involves changes in the molecular structure.

• It involves changes in phase but not changes in the molecular structure.

• It involves dissolving one substance into another.

• It involves a change in the state, or phase, of a substance.

• It involves the process of separating two or more dissolved substances.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Select the correct answer. Which is a chemical property of hydrogen?

• It is a light gas.

• It is a combustible gas.

• It is a colorless gas.

• It has a boiling point of -252.87°C.

• It is a good conductor of electricity.

Tags

NGSS.HS-PS1-1

Select the correct answer. Which types of orbitals are found in the principal energy level n = 2?

• s

• s, f

• s, d

• s, p

• s, p, d

Select the correct answer. What can you say about a calcium atom by looking at the symbol \( \frac{44}{20} \text{Ca} \)?

• A calcium atom has 44 neutrons and 20 electrons.

• A calcium atom has 20 protons and 24 electrons.

• A calcium atom has 64 protons and 20 neutrons.

• A calcium atom has 20 protons and 24 neutrons.

• A calcium atom has 20 protons and 44 neutrons.

Tags

NGSS.MS-PS1-1

Select the correct answer. Hydrogen (H-1), deuterium (H-2), and tritium (H-3) are the three isotopes of hydrogen. What are the values of a, b, and c in the table?

• a = 2, b = 3, c = 2

• a = 1, b = 2, c = 3

• a = 2, b = 1, c = 3

• a = 1, b = 1, c = 2

• a = 1, b = 1, c = 1

Tags

NGSS.HS-PS1-4

NGSS.HS-PS1-8

Select the correct answer. Using the information in the table, what is the average atomic mass of sulfur?

• 31.972 amu

• 32.060 amu

• 33.71 amu

• 34.090 amu

• 35.967 amu

Select the correct answer. Which of these elements has two valence electrons?

• hydrogen (H)

• barium (Ba)

• nitrogen (N)

• krypton (Kr)

• bromine (Br)

Tags

NGSS.HS-PS1-1

Select the correct answer. Which of these elements is a halogen?

• potassium (K)

• calcium (Ca)

• vanadium (V)

• gallium (Ga)

• bromine (Br)

Tags

NGSS.HS-PS1-1