Chemistry

Front

What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means. Examples include hydrogen, oxygen, and gold.

Front

What particle contributes the negative charge to the atom?

Back

The electron contributes the negative charge to the atom.

Front

What is the purpose of coefficients in a chemical equation?

Back

Coefficients are used to balance chemical equations, indicating the number of molecules or moles of a substance involved in the reaction.

Front

What does the subscript in a chemical formula indicate?

Back

The subscript indicates the number of atoms of the element in a molecule. For example, in MgBr₂, the '2' indicates there are 2 bromide ions for every magnesium ion.

Front

What is the charge of a proton?

Back

A proton has a positive charge of +1.

Front

What is the charge of a neutron?

Back

A neutron has no charge; it is neutral.

Front

What is the charge of an electron?

Back

An electron has a negative charge of -1.

Front

What is an ionic compound?

Back

An ionic compound is formed when atoms transfer electrons, resulting in the attraction between positively and negatively charged ions. Example: Sodium chloride (NaCl).

Front

What is the chemical formula for water?

Back

The chemical formula for water is H₂O, indicating it has 2 hydrogen atoms and 1 oxygen atom.

Front

What is the atomic number?

Back

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