Virginia Chemistry

What kelvin temperature is equivalent to -24 ⁰C?

• a. 226 K
• b. 249 K
• c. 273 K
• d. 297 K

More than two-thirds of the elements are classified as

• a. nonmetals
• b. metals
• c. metalloids
• d. noble gases

The arrangement of the elements in the present Periodic Table is based on atomic

• a. mass
• b. number
• c. radius
• d. density

The elements in the modern Periodic Table are arranged according to their

• a. atomic number
• b. oxidation number
• c. atomic mass
• d. nuclear mass

In the ground state, atoms of the elements in Group 15 of the Periodic Table all have the same number of

• a. filled principal energy levels
• b. occupied principal energy levels
• c. neutrons in the nucleus
• d. electrons in the valence shell

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which element has chemical properties that are most similar to the chemical properties of sodium?

• a. Mg
• b. K
• c. Se
• d. Cl

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which element is a noble gas?

• a. krypton
• b. chlorine
• c. antimony
• d. manganese

Tags

NGSS.HS-PS1-1

The process of filtration is performed in the laboratory to

• a. form precipitates
• b. remove water from solutions
• c. separate dissolved particles from the solvent
• d. separate insoluble substances in an aqueous mixture

Identify the two gases in the unknown mixture.

• a. Gas A & Gas C
• b. Gas B & Gas C
• c. Gas A & Gas D
• d. Gas C & Gas D

Tags

NGSS.HS-PS1-3

Which segment of the graph represents the gas phase only?

• a. A-B
• b. B-C
• c. C-D
• e. E-F