Regents Chem Review

. What is conserved during a chemical reaction?

• mass, only

• neither mass nor charge

• both mass and charge

• charge, only

The forces between atoms that create

chemical bonds are the result of interactions

between

• protons and electrons

• protons and nuclei

• nuclei

• electrons

Given the reaction:

Which statement best describes the reaction?

• A bond is broken and energy is released.

• A bond is formed and energy is absorbed.

• A bond is broken and energy is absorbed.

• A bond is formed and energy is released.

As energy is released during the formation of a

bond, the stability of the chemical system generally

will

• decrease

• increase

• stay the same

Which particles may be gained, lost, or shared

by an atom when it forms a chemical bond?

• protons

• nucleons

• electrons

• neutrons

Which symbol represents a particle that has

the same total number of electrons as S^2–?

• Ar

• Si

• O^2-

• Se^2-

Which of these elements has an atom with the

most stable outer electron configuration?

• Na

• Ca

• Ne

• Cl

Which bond is least polar?

• As-Cl

• Bi-Cl

• N-Cl

• P-Cl

Given the Lewis electron-dot diagram:

Which electrons are represented by all of the dots?

• all of the carbon and hydrogen electrons

• the carbon and hydrogen valence electrons

• the carbon valence electrons, only

• the hydrogen valence electrons, only

When a sodium atom reacts with a chlorine

atom to form a compound, the electron

configurations of the ions forming the compound

are the same as those in which noble gas atoms?

• krypton and neon

• krypton and argon

• neon and argon

• neon and helium