August 2017 Chemistry Regents Questions 21-30 Question Preview (ID: 59762)

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At STP, a 12.0-liter sample of CH4(g) has the same total number of molecules as

a) 6.0 L of H2(g) at STP

b) 12.0 L of CO2(g) at STP

c) 18.0 L of HCl(g) at STP

d) 24.0 L of O2(g) at STP

At standard pressure, during which physical change does the potential energy decrease?

a) liquid to gas

b) liquid to solid

c) solid to gas

d) solid to liquid

Which equation represents a chemical equilibrium?

a) 1

b) 2

c) 3

d) 4

The amount of randomness of the atoms in a system is an indication of the

a) entropy of the system

b) polarity of the system

c) excited state of the atoms

d) ground state of the atoms

When a sample of Ca(s) loses 1 mole of electrons in a reaction with a sample of O2(g), the oxygen

a) loses 1 mole of electrons

b) loses 2 moles of electrons

c) gains 1 mole of electrons

d) gains 2 mole of electrons

Which reaction occurs at the anode of an electrochemical cell?

a) oxidation

b) reduction

c) neutralization

d) transmutation

Which substance is an electrolyte?

a) CCl4

b) C6H12O6

c) SiO2

d) H2SO4

In which process does a heavy nucleus split into two lighter nuclei?

a) titration

b) fission

c) electrolysis

d) neutralization

Which process converts mass into energy?

a) distillation of ethanol

b) filtration of a mixture

c) fusion of hydrogen atoms

d) ionization of cesium atoms

Which radioisotope is used to determine the age of once-living organisms?

a) carbon-14

b) carbon-14

c) iodine-131

d) uranium-238

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