June 2019 Chemistry Regents Questions 11-20 Question Preview (ID: 59728)


Use Your Knowledge Of Chemistry To Answer All Questions In The Data Set. You Will Need Your Chemistry Reference Tables And A Calculator To Answer Some Of The Questions. Good Luck. TEACHERS: click here for quick copy question ID numbers.

During all chemical reactions, charge, mass and energy are
a) condensed
b) conserved
c) decayed
d) decomposed

The degree of polarity of a covalent bond between two atoms is determined by calculating the difference in their
a) atomic radii
b) melting points
c) electronegativities
d) ionization energies

Which substance can not be broken down by a chemical change?
a) ammonia
b) magnesium
c) methane
d) water

Which statement describes the components of a mixture?
a) Each component gains new properties.
b) Each component loses its original properties.
c) The proportions of components can vary.
d) The proportions of components cannot vary.

Table sugar can be separated from a mixture of table sugar and sand at STP by adding
a) sand, stirring, and distilling at 100.°C
b) sand, stirring, and filtering
c) water, stirring, and distilling at 100.°C
d) water, stirring, and filtering

Which statement describes the particles of an ideal gas, based on the kinetic molecular theory?
a) The volume of the particles is considered negligible.
b) The force of attraction between the particles is strong.
c) The particles are closely packed in a regular, repeating pattern.
d) The particles are separated by small distances, relative to their size.

During which two processes does a substance release energy?
a) freezing and condensation
b) freezing and melting
c) evaporation and condensation
d) evaporation and melting

Based on Table I, which compound dissolves in water by an exothermic process?
a) NaCl
b) NaOH
c) NH4Cl
d) NH4NO3

At STP, which property of a molecular substance is determined by the arrangement of its molecules?
a) half-life
b) molar mass
c) physical state
d) percent composition

Equilibrium can be reached by
a) physical changes, only
b) nuclear changes, only
c) both physical changes and chemical changes
d) both nuclear changes and chemical changes

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