Unit 2 Physical Science Review

Front

What is an ion?

Back

An ion is an atom that has gained or lost one or more electrons, resulting in a net electrical charge.

Front

What is the mass of a single electron?

Back

The mass of a single electron is approximately 0 amu (atomic mass units).

Front

What do the 'sticks' in a molecular model represent?

Back

The 'sticks' in a molecular model represent chemical bonds between atoms.

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition, such as ice melting.

Front

What is an atom?

Back

An atom is the smallest unit of matter that retains the properties of an element.

Front

What is a molecule?

Back

A molecule is a group of two or more atoms bonded together.

Front

What is a compound?

Back

A compound is a substance formed when two or more different elements are chemically bonded together.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change alters the form or appearance of a substance without changing its composition, while a chemical change results in the formation of new substances.

Front

What is the nucleus of an atom?

Back

The nucleus is the central part of an atom, containing protons and neutrons.

Front

What are protons?

Back

Protons are positively charged particles found in the nucleus of an atom.