Regents Chemistry Midterm Quiz

Which conclusion was developed as a result of the gold foil experiment?

• Atoms are mostly empty space

• All atoms are hard, indivisible spheres

• Atoms have different volumes

• All atoms have the same volume

An excited potassium atom emits a specific amount of energy when one of its electrons moves from

• the first shell to the fourth shell

• the second shell to the fourth shell

• the fourth shell to the fifth shell

• the fourth shell to the second shell

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Which list of elements includes a metal, a metalloid, and a noble gas?

• Rb, Cl, Ne

• Sr, Si, Rn

• Rn, Cl, Ne

• Si, Rb, Sr

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Which element has chemical properties most similar to sodium?

• magnesium

• oxygen

• phosphorus

• rubidium

Which phrase describes the crystal structure and properties of two different forms of solid carbon called diamond and graphite?

• same crystal structure and same properties

• same crystal structure and different properties

• different crystal structures and different properties

• different crystal structures and same properties

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

• sodium chloride

• krypton

• glucose

• water

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Which sample of matter is a mixture?

• CO₂ (g)

• CCl₄ (ℓ)

• MgCl₂ (aq)

• Sn (s)

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

• 50. g of sulfur at 273 K

• 40. g of aluminum at 298 K

• 30. g of 303 K

• 20. g of aluminum at 323 K

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Which process represents a chemical change?

• Iodine sublimates.

• Water evaporates.

• An ice cube melts.

• A candle burns in the air.

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What is the net (overall) charge of a monatomic ion that has 15 protons, 16 neutrons, and 18 electrons?

• 2+

• 2-

• 3+

• 3-

Tags

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