June 2019 Chemistry Regents Questions 21-30 Question Preview (ID: 59729)


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.

Which value is defined as the difference between the potential energy of the products and the potential energy of the reactants during a chemical change?
a) heat of fusion
b) heat of reaction
c) heat of deposition
d) heat of vaporization

The effect of a catalyst on a chemical reaction is to provide a new reaction pathway that results in a different
a) potential energy of the products
b) heat of reaction
c) potential energy of the reactants
d) activation energy

Chemical systems in nature tend to undergo changes toward
a) lower energy and lower entropy
b) lower energy and higher entropy
c) higher energy and lower entropy
d) higher energy and higher entropy

The atoms of which element bond to one another in chains, rings, and networks?
a) barium
b) carbon
c) iodine
d) mercury

What is the general formula for the homologous series that includes ethene?
a) CnH2n
b) CnH2n-6
c) CnH2n-2
d) CnH2n+2

When an F atom becomes an F- ion, the F atom
a) gains a proton
b) loses a proton
c) gains an electron
d) loses an electron

Which substance is an Arrhenius base?
a) HNO3
b) H2SO3
c) Ca(OH)2
d) CH3COOH

In which type of nuclear reaction do two light nuclei combine to produce a heavier nucleus?
a) positron emission
b) gamma emission
c) fission
d) fusion

Using equal masses of reactants, which statement describes the relative amounts of energy released during a chemical reaction and a nuclear reaction?
a) The chemical and nuclear reactions release equal amounts of energy.
b) The nuclear reaction releases half the amount of energy of the chemical reaction.
c) The chemical reaction releases more energy than the nuclear reaction.
d) The nuclear reaction releases more energy than the chemical reaction.

The ratio of the mass of U-238 to the mass of Pb-206 can be used to
a) diagnose thyroid disorders
b) diagnose kidney function
c) date geological formations
d) date once-living things

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