Regents 612

The mass of a proton is approximately equal to the mass of

• an alpha particle

• a beta particle

• a positron

• a neutron

An orbital of an atom is defined as the most probable location of

• an electron

• a neutron

• a positron

• a proton

What must occur when an electron in an atom returns from a higher energy state to a lower energy state?

• A specific amount of energy is released.

• A random amount of energy is released.

• The atom undergoes transmutation.

• The atom spontaneously decays.

Tags

NGSS.HS-PS4-3

Which element is a liquid at 305 K and 1.0 atmosphere?

• magnesium

• fluorine

• gallium

• iodine

Which list of elements consists of a metal, a metalloid, and a nonmetal?

• Li, Na, Rb

• Cr, Mo, W

• Sn, Si, C

• O, S, Te

At STP, which physical property of aluminum always remains the same from sample to sample?

• mass

• density

• length

• volume

Which statement describes a chemical property of silicon?

• Silicon has a blue-gray color.

• Silicon is a brittle solid at 20°C.

• Silicon melts at 1414°C.

• Silicon reacts with fluorine.

Tags

NGSS.HS-PS1-1

Which diagram represents a mixture of two different molecular forms of the same element?

• 1

• 2

• 3

• 4

A compound is broken down by chemical means during

• chromatography

• distillation

• electrolysis

• filtration

Which quantities must be conserved in all chemical reactions?

• mass, charge, density

• mass, charge, energy

• charge, volume, density

• charge, volume, energy

Tags

NGSS.HS-PS1-7