Matter

Chemical change

A change that produces a new substance. Chemical change. A chemical change is when substances combine or break apart to form entirely new substances with different properties.

Chemical property

A property that is not visible until a substance undergoes a chemical reaction, like solubility. Chemical property. A chemical property describes how a substance interacts with other substances to form new compounds.

Chemical reaction

The process where substances change into different substances through the breaking of chemical bonds. Chemical reaction. A chemical reaction is when substances mix and their atoms rearrange to form new substances.

Compound

The substance made when atoms from two or more elements combine chemically. Compound. A compound is a substance formed when different types of atoms bond together.

Element

A substance made of one type of atom that cannot be broken down chemically. Element. An element is a pure substance consisting of only one kind of atom.

Energy

The ability to do work. Energy. Energy is the capacity to perform tasks or cause changes in systems.

Gas

A state of matter that has no fixed shape or volume. Gas. Gas is a state of matter where particles move freely and spread out to fill available space.

Heterogeneous mixture

A mixture in which substances are not evenly mixed. Heterogeneous mixture. In science, a heterogeneous mixture is one where you can see the different components, like a salad with various ingredients not blended together.

Homogeneous mixture

A mixture in which substances are evenly mixed also called a solution. Homogeneous mixture. A homogeneous mixture is when different components are combined so well that they appear as a single substance.

Law of conservation of mass

States that mass cannot be created or destroyed in a chemical reaction. Law of conservation of mass. It means that in a chemical reaction, the total mass of the substances involved stays the same.

Liquid

A state of matter that has definite volume but no definite shape. Liquid. Liquid flows easily and takes the shape of its container while maintaining a constant volume.

Mixture

A combination of substances that keep their individual properties. Mixture. In science, a mixture is when two or more substances are combined without any chemical reactions, so they each maintain their original characteristics.

Molecule

A group of atoms held together by bonds. Molecule. A molecule is a cluster of atoms joined by chemical bonds, forming the basic unit of a chemical compound.

Periodic table

A chart of all the elements, arranged by their physical and chemical properties. Periodic table. The periodic table is a visual organization of elements based on their atomic structure and chemical behavior.

Physical change

A change in size, shape, or state but not in identity. Physical change. A physical change occurs when the form of a substance changes but its identity remains the same.

Physical property

A property of a substance we can observe without changing its identity, like color or hardness. Physical property. In Science, a physical property is something you can see or measure about a substance without altering what it's made of.

Product

A new substance formed by a chemical reaction. Product. In science, a product is a material that results from a chemical reaction.

Reactant

A substance that is changed in a chemical reaction. Reactant. In a chemical reaction, a reactant is a starting material that undergoes change to form a product.

Solid

The state of matter with definite shape and volume. Solid. A solid is a state of matter where the particles are packed closely together, maintaining a fixed shape.

Solution

A mixture of evenly distributed substances. solution. A solution is a type of mixture where one substance is dissolved evenly throughout another.

Water vapor

Water in the form of a gas. Water vapor. Water vapor is the gas that forms when water heats up and evaporates.