Regents Chemistry

Which process is a chemical change?

• condensation of H₂O(g)

• synthesis of MgO(s)

• evaporation of C₂H₅OH(l)

• sublimation of CO₂(s)

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which property is determined by the structure, arrangement, and interactions of the molecules of a substance at a given temperature and pressure?

• atomic radius

• half-life

• formula mass

• physical state

A collision between reactant particles is most likely to result in a reaction when the particles have proper orientation and proper

• charge

• energy

• mass

• radius

Given the equation representing a system at equilibrium: 2NO₂(g) ⇌ N₂O₄(g) Which statement describes this reaction at equilibrium?

• The concentration of the reactant and the product must be equal.

• The concentration of the reactant and the product must be constant.

• The rates of the forward and reverse reactions are increasing.

• The rates of the forward and reverse reactions are decreasing.

Which element must be present in an organic compound?

• carbon

• sulfur

• nitrogen

• oxygen

Tags

NGSS.HS-LS1-6

NGSS.HS-LS2-5

Which formula represents a saturated hydrocarbon?

• C₂H₂

• C₂H₄

• C₆H₁₀

• C₆H₁₄

Which reaction occurs at the anode in an electrochemical cell?

• saponification

• oxidation

• esterification

• reduction

Which statement describes the two types of reactions that occur in operating electrochemical cells?

• Nonspontaneous reactions occur in voltaic cells, and spontaneous reactions occur in electrolytic cells.

• Nonspontaneous reactions occur in electrolytic cells, and nonspontaneous reactions occur in voltaic cells.

• Spontaneous reactions occur in voltaic cells, and nonspontaneous reactions occur in electrolytic cells.

• Spontaneous reactions occur in electrolytic cells, and spontaneous reactions occur in voltaic cells.

Tags

NGSS.HS-PS3-5

Which term describes an acid according to one acid-base theory?

• H⁺ acceptor

• H⁺ donor

• H₂ acceptor

• H₂ donor

A 26.7-gram sample of which element has a volume of 3.00 cubic centimeters at room temperature?

• Cr

• Cd

• Nb

• Ni