Process by which atoms or groups of atoms in a substance are reorganized into different substances.

The starting substance in a chemical reaction...

A substance that lowers the activation energy needed to start a chemical reaction.

What is an enzyme?

The number in front of a reactant or a product in a chemical equation.

During this reaction, energy is absorbed:

Catalysts begin chemical reactions by lowering the activation energy needed to start the reaction.

During this reaction, energy is released in the form of heat:

A substance in which another is dissolved.

Molecule that has oppositely charged regions.

The measure of concentration of hydrogen ions in a solution.

Sand and sugar is an example of a homogeneous mixture.

Two or more atoms of different elements chemically bonded together.

A substance made from only one type of atom.

Two or more elements or compounds not chemically bonded together.

This process can separate out a mixture

This model suggests the atom is a sphere of positive charge, and negatively charges electrons are embedded in to balance the total positive charge.

Atoms of the same element with different numbers of neutrons.

Before electron discovery, atoms were thought to be soft, negatively charged cylinders.

The first shell of electrons in an atom can hold up to 2 electrons, and the second can hold up to 10.

The chemical bond that forms when electrons are shared is called a...

Attractions between molecules are called:

Van Der Waals forces are responsible for:

The process by which atoms or groups of atoms in substances are reorganized into different substances.

Reactants are the starting substances, on the left side of the arrow, and products are the substances formed during the reaction, on the right side of the arrow.

The number of atoms of each elements on the reactant side cannot equal the number of atoms of the same element on the product side.

The minimum amount of energy needed for reactants to form products is called:

Reactions that release energy in the form of heat are exothermic.

A catalyst is a substance that lowers the activation energy needed to start a chemical reaction.

Enzymes are biological catalysts that slow the rate of chemical reactions in biological processes.

Factors such as pH, temperature, and other substances affect enzyme activity.

The reactants that bind to an enzyme.

Buffers

Housed in the nucleus of the atom: