Science Unit Matter Vocabulary Students need to know the meaning of each word. matter – anything that takes up space and has mass physical properties – anything you can observe about an object using your senses Three states of matter: solid – a form of matter that takes up a specific amount of space and has a definite shape liquid – a form of matter that has volume that stays the same, but can change its shape gas – a form of matter that does not have a definite shape or a definite volume evaporation – the process by which a liquid changes into a gas Small particles that make up matter: atom – the basic building block of matter. molecule – the smallest particle of a substance that keeps its physical properties. It is made up of atoms. Ways to measure matter: volume – the amount of space that matter takes up mass – the amount of matter in an object physical change – a change to matter in which no new kinds of matter are formed Important Information Students need to know: 1. Objects are made of materials that can be described by their physical properties. 2. There are three states of matter: solid, liquid, and gas. 3. Matter can be measured. The amount of matter is an object is its mass, and the amount of space the matter takes up is its volume. 4. Matter is made of parts that are too small to be seen without magnification. Atoms are the smallest particles. Molecules are made up of atoms. 5. The physical properties of matter stay the same when the shape or size of the matter is changed. This is called a physical change. Example: When you cut a sheet of paper in half with scissors, each smaller piece is still paper. The matter did not change. Skills Students should be able to: 1. Name the three states of matter and describe each state. 2. Name examples of physical properties of matter (size, shape, color, texture, temperature, and smell are examples) and be able to describe an object by telling about its physical properties. 3. Name examples of physical changes, such as molding a piece of clay into a new shape or changing the temperature of an object (melting an ice cube to get liquid water).