January 2023 Chemistry Regents Questions 11-20 Question Preview (ID: 61255)

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Which statement describes the changes in bonding and energy that occur when a molecule of iodine, I2, forms two separate atoms of iodine?

a) A bond is formed as energy is absorbed.

b) A bond is formed as energy is released.

c) A bond is broken as energy is absorbed.

d) A bond is broken as energy is released.

The degree of polarity in the bond between a hydrogen atom and an oxygen atom in a molecule of water can be assessed using the difference in

a) densities

b) electronegativities

c) melting points

d) intermolecular forces

Which substance can not be broken down by a chemical change?

a) ammonia

b) ethanol

c) krypton

d) water

Which sample of matter is a mixture?

a) CO2(g)

b) CCl4(l)

c) MgCl2(aq)

d) Sn(s)

Which term is used to express the concentration of an aqueous solution?

a) parts per million

b) heat of fusion

c) pressure at 0°C

d) volume at 0°C

The particles in which sample have the lowest average kinetic energy?

a) 50. g of sulfur at 273 K

b) 40. g of aluminum at 298 K

c) 30. g of sulfur at 303 K

d) 20. g of aluminum at 323 K

Which process represents a chemical change

a) Iodine sublimes.

b) Water evaporates.

c) An ice cube melts.

d) A candle burns in air.

Which equation represents a physical equilibrium?

a) 1

b) 2

c) 3

d) 4

Systems in nature tend to undergo changes toward

a) higher energy and higher entropy

b) higher energy and lower entropy

c) lower energy and higher entropy

d) lower energy and lower entropy

Which formula represents a hydrocarbon?

a) C2H6

b) C2H5OH

c) C2H5Cl

d) C2H6

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