Matter

Chemical change

A change that produces a new substance. Chemical change. A chemical change is when substances combine or break apart to form 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 is a characteristic that describes a substance's ability to change into a different substance.

Compound

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

Density

An object's mass per unit volume. Density. Density tells us how much stuff an object has packed into a certain space.

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.

Heterogeneous mixture

A mixture in which substances are not evenly mixed. Heterogeneous mixture. In Science, a heterogeneous mixture is when you can see the different parts, like salad with vegetables.

Homogeneous mixture

A mixture in which substances are evenly mixed also called a solution. homogeneous mixture. In science, a homogeneous mixture is when different substances are mixed so thoroughly that they look and feel like a single substance.

Mass

The amount of matter in an object. Mass. Mass is a measure of how much stuff is inside an object.

Matter

Anything that has volume and mass. Matter. Matter is anything that takes up space and has weight.

Mixture

A combination of substances that keep their individual properties. Mixture. In Science, a mixture is when two or more substances are combined but each one retains its own properties.

Molecule

A group of atoms held together by bonds. Molecule. A molecule is a combination of two or more atoms bonded together, forming the smallest unit of a chemical compound.

Physical change

A change in size, shape, or state but not in identity. Physical change. A physical change alters the form of a substance but not its chemical composition.

Physical property

A property of a substance we can observe without changing its identity, like color or hardness. Physical property. It's a characteristic of a substance that we can see or measure without changing what the substance is.

Solution

A mixture of evenly distributed substances. Solution. A solution is a homogeneous mixture where one substance is dissolved in another.

Substance

An element or compound with the same composition and properties throughout. Substance. In Science, a substance is a form of matter with consistent chemical and physical properties.