Matter What is matter?

Matter: What is it? Defined as anything that has mass and takes up space. Everything around you is made up of matter A chocolate cake is made up of matter You are made up of matter

Matter continued: Matter can be small or large All matter is made up of atoms and molecules Objects can be made up of different atoms Example: Gold is made up of Gold atoms Salt is made up of two different atoms: sodium atoms and chloride atoms

Physical Properties of Matter Any quality or condition of a substance that can be seen or measured without changing the substances identity. For Example: color, solubility, odor, hardness, melting point, and state of matter Remember Density is a physical property

States of Matter Solid Liquid Gas

Microscopic view of a solid Solids Definite volume Definite shape Atoms are packed together if fixed positions Strong attractive forces between atoms Only vibrate in place

Microscopic view of a liquid Liquids Definite volume Indefinite shape Atoms are close together Atoms can overcome attractive forces to flow

Microscopic view of a gas Gases Indefinite volume and shape Atoms move very fast Atoms are far apart Weak attractive forces

Changes in Matter Physical Change Chemical Change

Physical change change in a substance that doesn’t change the identity of the substance Example: Includes all changes in the state of matter (physical changes of a substance from one state to another) Grinding cutting Melting boiling

Changes in the state of matter deposition

Chemical change a change in which a substance is converted into a different substance same as chemical reaction doesn’t change the amount of matter present

Signs of a chemical change Energy is absorbed or given off (change in temperature) change in color or odor production of gas Irreversible

Chemical or Physical Change? Water boils Salt dissolves in water Milk spoils A metal chair rusts Paper is torn A tree burns down physical physical chemical chemical physical chemical