Chemistry Unit 2

The ____________ principle is the principle of quantum physics that states that it is impossible to determine accurately both the position and the speed of an electron at the same time.

• Pauli exclusion

• magnetic

• Newton's

• Heisenberg uncertainty

• Aufbau

The ____________ principle is a principle of quantum mechanics that states that an electron always occupies the orbital with lowest energy available.

• Hund's

• magnetic

• Pauli exclusion

• Aufbau

• orbital

The process of physically separating a single-phase mixture into components if the components have different boiling points is called simple _________.

• distillation

• chromatography

• filtration

• solubility

• fractional distillation

Chlorine could combine with ____________ to gain the extra electron it needs to stabilize the outer shell.

• helium

• iodine

• sulfur

• phosphorus

• hydrogen

A mixture in which the individual components form a single phase with uniform consistency is ___________.

• solution

• crystallization

• homogeneous

• suspension

• heterogeneous

The ____________ theory states that light, as well as electrons have the properties of both waves and particles.

• photoelectric effect

• emission spectrum

• quantum

• principal

• wave-duality

A change in a substance that does not involve a change in its composition is a(n) __________ change.

• electric

• physical

• polar

• chemical

• atomic

The _________ is a weighted average of the relative atomic masses of all the isotopes of an element.

• atomic mass

• symbol

• mass number

• atomic number

• isotope

The __________ principle is a principle of quantum mechanics that states that orbitals of equal energy are each occupied by a single electron before any orbital is occupied by a second electron.

• magnetic rule

• orbital notation

• Pauli exclusion

• Aufbau law

• Hund's rule

A characteristic of a substance that can only be observed during a chemical reaction in which a substance either combines chemically with another substance or the substance breaks down chemically into simpler substances is called a(n) __________ property.

• chemical

• physical

• extensive

• normal

• intensive