August 2022 Chemistry Regents Questions 41-50 Question Preview (ID: 61273)

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Which two particle diagrams represent two different phases of the same compound, only?

a) A and B

b) A and C

c) B and C

d) B and D

A sample of KCl(s) is dissolved in water to form KCl(aq). When the water in the KCl(aq) is completely evaporated, KCl(s) remains. Which statement describes a property of the KCl(s) after the water evaporated?

a) The KCl(s) becomes a molecular compound.

b) The molar mass of the KCl(s) decreases.

c) The melting point of the KCl(s) is unchanged.

d) The KCl(s) conducts an electric current.

Which statement describes ice and liquid water in a stoppered flask at 0°C at equilibrium?

a) The rate of melting must equal the rate of freezing.

b) The rate of freezing must be greater than the rate of melting.

c) The mass of the ice must equal the mass of the liquid water.

d) The mass of the ice must be greater than the mass of the liquid water.

When heat is added to the system, the concentration of N2(g)

a) decreases and the concentration of NO(g) decreases

b) decreases and the concentration of NO(g) increases

c) increases and the concentration of NO(g) increases

d) increases and the concentration of NO(g) decreases

Which numbered interval represents the activation energy of the reaction?

a) 1

b) 2

c) 3

d) 4

What is a chemical name for the compound?

a) 2-chloropentene

b) 2-chloropentane

c) 4-chloropentene

d) 4-chloropentane

Which formula represents a saturated organic compound?

a) C2H2

b) C2H4

c) C3H4

d) C3H8

The compounds CH3CH2CH2OH and CH3OCH2CH3 have different

a) numbers of carbon atoms per mole

b) numbers of hydrogen atoms per mole

c) functional groups

d) molecular masses

Which phrase describes the direction of electron flow in this cell?

a) from Ni(s) through the wire to Mg(s)

b) from Mg(s) through the wire to Ni(s)

c) from Ni2+(aq) ions through the salt bridge to Mg2+(aq) ions

d) from Mg2+(aq) ions through the salt bridge to Ni2+(aq) ions

According to one acid-base theory, which pair are the H+ donors?

a) NH3(aq) and H2O(l)

b) NH3(aq) and OH-(aq)

c) NH4+(aq) and H2O(l)

d) NH4+(aq) and OH-(aq)

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