June 2018 Chemistry Regents Questions 21-30 Question Preview (ID: 59752)

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The energy released during a nuclear reaction is a result of

a) breaking chemical bonds

b) forming chemical bonds

c) mass being converted to energy

d) energy being converted to mass

Which particle has the least mass?

a) alpha particle

b) beta particle

c) neutron

d) proton

The stability of an isotope is related to its ratio of

a) neutrons to positrons

b) neutrons to protons

c) electrons to positrons

d) electrons to protons

Which equation represents neutralization?

a) 6Li(s) + N2(g) → 2Li3N(s)

b) 2Mg(s) + O2(g) → 2MgO(s)

c) 2KOH(aq) + H2SO4(aq) → K 2SO4(aq) + 2H2O(ℓ)

d) Pb(NO3)2(aq) + K2CrO4(aq) → 2KNO3(aq) + PbCrO4(s)

The concentration of which ion is increased when LiOH is dissolved in water?

a) hydroxide ion

b) hydrogen ion

c) hydronium ion

d) halide ion

Which process requires energy to decompose a substance?

a) electrolysis

b) neutralization

c) sublimation

d) synthesis

Which energy conversion occurs in an operating voltaic cell?

a) chemical energy to electrical energy

b) chemical energy to nuclear energy

c) electrical energy to chemical energy

d) electrical energy to nuclear energy

Which formula can represent an alkyne?

a) C2H4

b) C2H6

c) C3H4

d) C3H6

Which formula represents an isomer of this compound?

a) 1

b) 2

c) 3

d) 4

The use of uranium-238 to determine the age of a geological formation is a beneficial use of

a) nuclear fusion

b) nuclear fission

c) radioactive isomers

d) radioactive isotopes

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