Chemistry Vocabulary
100

This tiny, basic building block makes up all matter in the universe.

What is an atom?

200

You get this type of substance when two or more different types of elements are chemically joined together.

What is a compound?

300

This iconic chart organizes all known chemical elements by their atomic structures and properties.

What is the Periodic Table?

400

Ranging from 0 to 14, this scale measures how acidic or basic a liquid substance is.

What is pH?

500

This pure substance is made of only one type of atom and cannot be broken down into anything simpler.

What is an element?

600

This force of attraction holds atoms together so they can form brand-new substances.

What is a chemical bond?

700

This law states that matter cannot be created or destroyed, meaning total mass stays equal before and after a reaction.

What is the Law of Conservation of Mass?

800

Water (H2O) is a famous example of this group of two or more atoms stuck together by chemical bonds.

What is a molecule?

900

During this process, starting substances rearrange their atoms to transform into completely new substances.

What is a chemical reaction?

1000

This term describes an atom or molecule that carries an electrical charge because it gained or lost electrons.

What is an ion?

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