Chemistry Benchmark

What characteristics do elements within a group share with one another?

• all have similar chemical and physical properties
• all exist in the same state of matter
• all have the same atomic mass
• all have the same number of neutrons

Which of the following is true about halogens?

• they have one valence electron
• they have two valence electrons
• they have seven valence electrons
• they have eight valence electrons

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which of the following substances would you expect to have the lowest melting point?

• sodium chloride
• silicon dioxide
• carbon dioxide
• aluminum chloride

Tags

NGSS.HS-PS1-3

Which of the following best describes a solution?

• a homogeneous mixture composed of two or more pure substances in different states of matter
• a homogeneous mixture composed of two or more pure substances in the same state of matter
• a homogeneous mixture composed of one pure substance with portions in different states of matter
• a heterogeneous mixture composed of two or more pure substances in the same state of matter

Which of the following is evidence of a chemical change?

• change of state
• change of shape
• change of size
• change of chemical composition

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Why are noble gases non-reactive?

• they are ionic in nature
• they have atoms which are bonded to one another
• their valence orbitals are completely occupied
• none of the above

Tags

NGSS.HS-PS1-1

Which two atoms are isotopes of the same element?

• atom A: 47 protons and 60 neutrons; atom B: 48 protons and 59 neutrons
• atom A: 47 protons and 60 neutrons; atom B: 47 protons and 62 neutrons
• atom A: 46 protons and 60 neutrons; atom B: 47 protons and 59 neutrons
• atom A: 47.5 protons and 60 neutrons; atom B: 47.5 protons and 59 neutrons

Where is most of the atom's mass located?

• protons
• neutrons
• electrons
• nucleus

All of the oxidation numbers in a neutral compound add up to ________.

• 0
• +1
• -1
• it depends on the compound

A student heated 10 grams of a clear, colorless liquid over a Bunsen burner. The liquid gradually decreased in volume until no liquid remained and only 0.5 grams of a white solid was left. Which of the following statements makes sense as an explanation for the identity of the original liquid?

• Heat caused a reaction that converted the clear, colorless liquid to a white solid.
• A solution present in the original solute evaporated leaving behind the solvent, which can be identified as a white solid.
• A solvent present in the original solution evaporated leaving behind the solute, which can be identified as a white solid.
• A solute present in the original solution evaporated leaving behind the solvent, which can be identified as a white solid.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

NGSS.MS-PS1-5