Chapter 1 Matter and Change

Chemistry Def – The study of matter and the changes that matter undergoes

Matter Def – anything that has mass and occupies space

Mass vs Weight Mass – a measure of the amount of matter in an object (grams) Weight – a measure of the gravitational force acting upon an object (Newtons)

Extensive v Intensive properties Extensive properties depend upon the amount of matter present Ex: Mass, volume, etc Intensive Properties do NOT depend upon the amount of matter present Ex: Boiling point, melting point, density,etc **Intensive Properties are more useful in terms of identifying substances!

Physical Properties definition: a characteristic that can be observed or measured without changing the identity of the substance. ex: melting point, boiling point, density, color

Chemical Properties definition: a substance’s ability to undergo changes that transform it into a different substance. combustion (burning) reaction with an acid

Properties of Paper Brainstorm – Chemical and Physical Properties of paper.

How is Matter Classified? BBC video

Classification of Matter Elements Compounds Mixtures homogeneous heterogeneous

Elements Elements are pure substances that contain only one type of atom. Examples: Cu, O2, C60

Compounds Compounds are pure substances that contain two or more types of atoms that are chemically bonded together. They can be broken down into simpler substances. Ex: H2O, NaCl, CO2

Mixtures Mixtures contain two or more substances (elements or compounds) that are blended together, but NOT chemically bonded. Each substance maintains its own identity. Ex: saltwater, soil

Homogeneous Mixtures The substances in a homogeneous mixture are spread uniformly throughout each other. Ex: saltwater

Heterogeneous Mixtures The substances in a heterogeneous mixture are not evenly spread throughout each other. Ex: salad dressing