Chem Regents Exam 6/2019 (Parts A)

Which particles are found in the nucleus of an

argon atom?

• protons and electrons

• positrons and neutrons

• protons and neutrons

• positrons and electrons

The diagram attached represents a particle traveling

through an electric field.

Which particle remains undeflected when

passing through this electric field?

• Proton

• Electron

• Neutron

• 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

Compared to the energy of an electron in the

second shell of an atom of sulfur, the energy of

an electron in the

• first shell is the same

• third shell is the same

• third shell is lower

• first shell is lower

In the ground state, an atom of which element

has seven valence electrons?

• sodium

• phosphorus

• nitrogen

• fluorine

Which information is sufficient to differentiate a

sample of sodium from a sample of silver?

• the mass of each sample

• the volume of each sample

• the reactivity of each sample with water

• the phase of each sample at room temperature

Graphite and diamond are two forms of solid

carbon at STP. These forms have

• different molecular structures and different

  properties

• the same molecular structures and different

  properties

• the same molecular structures and the same

  properties

• different molecular structures and the same

  properties

As the first five elements in Group 14 are

considered in order from top to bottom, there

are changes in both the

• number of valence shell electrons and

  number of fi rst shell electrons

• electronegativity values and number of fi rst

  shell electrons

• number of valence shell electrons and atomic

  radii

• electronegativity values and atomic radii

Which statement explains why NaBr is classified

as a compound?

• Na and Br are chemically combined in a fixed

  proportion.

• Na and Br are both nonmetals.

• NaBr is a solid at 298 K and standard

  pressure.

• NaBr dissolves in H2O at 298 K.

Which two terms represent types of chemical

formulas?

• fission and fusion

• oxidation and reduction

• empirical and structural

• endothermic and exothermic