Chemistry Review

Front

What is a molecule?

Back

A molecule is a group of two or more atoms bonded together. It is the smallest unit of a chemical compound that retains its chemical properties.

Front

What does a subscript in a chemical formula indicate?

Back

A subscript indicates the number of atoms of the element in a molecule. For example, in H2O, the '2' indicates there are two hydrogen atoms.

Front

How do you determine the number of molecules in a chemical formula?

Back

The number of molecules is determined by the coefficients in front of the formula. If there is no coefficient, it is assumed to be 1.

Front

What is the atomic number of an element?

Back

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

Front

What is the role of neutrons in an atom?

Back

Neutrons help stabilize the nucleus of an atom. They have no charge and contribute to the atomic mass.

Front

What is the universal solvent?

Back

Water is known as the universal solvent because it can dissolve more substances than any other liquid.

Front

What is surface tension?

Back

Surface tension is the property of a liquid that allows it to resist an external force, due to the cohesive nature of its molecules.

Front

What is capillary action?

Back

Capillary action is the ability of a liquid to flow in narrow spaces without the assistance of external forces, often seen in plants.

Front

What is a chemical reaction?

Back

A chemical reaction is a process that leads to the transformation of one set of chemical substances to another.

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 chemically bonded together.