CHEM Ch. 3 Review

Front

What does the law of definite proportions state?

Back

Any two samples of a chemical compound will have the same elements in the same proportions by mass.

Front

What are isotopes?

Back

Atoms of the same element that have different masses due to varying numbers of neutrons.

Front

What is the smallest unit of an element?

Back

The atom, which can exist alone or in combination with other atoms.

Front

How is the average atomic mass of an element defined?

Back

It is the weighted average of all naturally occurring isotopes of the element.

Front

What was a key finding from Rutherford's experiments with gold foil?

Back

Most of the particles passed through the foil, indicating that atoms are mostly empty space.

Front

What is an element?

Back

A pure substance that cannot be broken down into simpler substances by chemical means.

Front

What is the atomic number of an element?

Back

The number of protons in the nucleus of an atom, which determines the element's identity.

Front

What is a molecule?

Back

A group of two or more atoms bonded together, representing the smallest fundamental unit of a chemical compound.

Front

What is the difference between an atom and a molecule?

Back

An atom is a single unit of an element, while a molecule is a combination of two or more atoms.

Front

What is a neutron?

Back

A subatomic particle found in the nucleus of an atom, with no charge.