Definition Quiz 1

Allotrope

• different molecular structures and different

  properties

• different molecular structures and the same properties

• the same molecular structures and different

  properties

• the same molecular structures and the same

  properties

Which particle remains undeflected when

passing through this electric field?

• Proton

• Neutron

• Electron

• Positron

The mass of an electron is

• equal to the mass of a proton

• equal to the mass of a neutron

• greater than the mass of a proton

• less than the mass of a neutron

Which statement explains why NaBr is classified

as a compound?

(1)

(2)

(3)

(4)

• NaBr dissolves in H2O at 298 K.

• Na and Br are both nonmetals.

• NaBr is a solid at 298 K and standard pressure.

• Na and Br are chemically combined in a fixed proportion.

During all chemical reactions, charge, mass and

energy are

• conserved

• decomposed

• decayed

• condensed

The degree of polarity of a covalent bond

between two atoms is determined by calculating

the difference in their

• melting points

• atomic radii

• ionization energies

• electronegativities

Which statement describes the components of a

mixture?

• The proportions of components can vary.

• Each component loses its original properties.

• Each component gains new properties.

• The proportions of components cannot vary.

Table sugar can be separated from a mixture of

table sugar and sand at STP by adding

• water, stirring, and distilling at 100.°C

• sand, stirring, and filtering

• water, stirring, and filtering

• sand, stirring, and distilling at 100.°C

When an F atom becomes an F^ ion, the F atom

• gains a proton

• loses an electron

• gains an electron

• loses a proton

Which electron configuration represents an atom of chlorine in an excited state?

• 2-8-7-2

• 2-8-8

• 2-7-8

• 2-8-7