TE21 Round 3

Front

What is the Periodic Table?

Back

A tabular arrangement of chemical elements, organized by their atomic number, electron configuration, and recurring chemical properties.

Front

What is an element?

Back

A pure substance that cannot be broken down into simpler substances by chemical means. Examples include oxygen (O) and magnesium (Mg).

Front

What is a compound?

Back

A substance formed when two or more elements are chemically bonded together. Example: potassium chloride (KCl).

Front

What is the relationship between oxygen and sulfur in the Periodic Table?

Back

Oxygen and sulfur are in the same group, but not the same period. They have similar reactivity due to being in the same group.

Front

What happens to molecules when a gas cools and becomes a liquid?

Back

The molecules slow down and get closer together.

Front

What is cellular hierarchy?

Back

The organization of biological structures from smallest to largest: cells, tissues, organs, organ systems, and organisms.

Front

What is the atomic number?

Back

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

Front

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

Back

A physical change alters the form of a substance but not its chemical composition, while a chemical change results in the formation of new substances.

Front

What are neutrons?

Back

Subatomic particles found in the nucleus of an atom that have no charge and contribute to the atomic mass.

Front

What is reactivity in chemistry?

Back

The tendency of a substance to undergo a chemical reaction, either by itself or with other materials.