Molecules

Front

What are pure substances?

Back

Pure substances are materials that are made of only one type of particle. They can be elements or compounds.

Front

What is an element molecule?

Back

An element molecule is a molecule that consists of two or more atoms of the same element, such as H₂ (hydrogen gas).

Front

What is a compound?

Back

A compound is a substance formed when two or more different elements are chemically bonded together, like NaCl (table salt).

Front

What is the difference between an element and a compound?

Back

An element is a pure substance made of only one type of atom, while a compound is made of two or more different types of atoms.

Front

What is the basic building block of matter?

Back

The basic building block of matter is the atom.

Front

What are electrons?

Back

Electrons are negatively charged particles that orbit the nucleus of an atom.

Front

What is the charge of a proton?

Back

A proton has a positive charge.

Front

What is the charge of a neutron?

Back

A neutron has no charge (it is neutral).

Front

What is the nucleus of an atom?

Back

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

Front

What is the chemical formula for water?

Back

The chemical formula for water is H₂O.