WE WILL NOW BE STARTING ON CHEMISTRY TOPICS!  WHAT IS CHEMISTRY?  WHAT DOES IT HAVE TO DO WITH OUR LIVES?  Take this time to fill out the KWL (Know, Want to Know, Learned) on what you know and want to learn about CHEMISTRY CHEMISTRY: The study of what things are made of, their properties, and how they interact and change.

Chapter 1 Test  2 st Period Average: 30/44 High Scores: Logan* and Madi  3rd Period Average: 31/44 High Scores: Mercedes and Ceara  4th Period Average: 32/44 High Scores: Danny C, Ethan*, Haylie, and Sam

WHAT IS MATTER AND WHY DOES IT MATTER ? CHAPTER 2 - MATTER

What is Matter?  Anything you can hold or touch is matter.  Matter is anything that has mass and occupies space (volume).  Examples include you, your friends, and the table you are sitting at.

Is It Matter  Oxygen  The Air you breathe  Light  A rock  The moon  Light

What is Matter Made of?  Atoms are the building blocks of all matter.  There are many different kinds of atoms, 117 in all.  These different kinds are called elements.  By combining these we get every known matter.

What element are these made of?

What is the Human Body Made Of?

How does it work?  Elements combine to form compounds  Example: Nylon – made up of carbon, hydrogen, nitrogen, and oxygen atoms  Compounds have unique properties, every compound is different from the elements that make it.  The elements that form nylon are gases, yet when combined they produce a flexible solid

Molecules  Atoms can also combine to form molecules.  A molecule is the smallest unit of a substance that keeps the same physical and chemical properties.  Example: Water – made up of two hydrogen atoms and one oxygen atom (H20). These elements join together to form a unit so that each water molecule is uniform

Chemical Formulas  We use chemical formulas to represent compounds and our molecules.  A chemical formula shows how many atoms of each element are in a unit of a substance  Example H20

What we have so far?  Everything that has mass and volume is matter.  Matter is made up of atoms.  Two or more different types of atom equals a compound.  Atoms combine to form molecules which act as a unit  What do compounds and molecules form to make?

Pure Substances and Mixtures  Pure substances have a fixed composition and definite properties. Example is water.  Mixture is a combination of pure substances. Example is salt water  A mixture can be separated into its core components without a chemical change while a pure substance cannot.

Pure Substance or Mixture  A block of Iron  The air we breathe  A glass of water  A glass of orange juice

Mixtures  Are formed by mixing pure substances.  Mixtures are classified by how thoroughly the substances mix.  Homogeneous mixtures-mixture is same throughout.  Heterogeneous mixture-mixture is not the same throughout.

Heterogeneous or Homogeneous

Review  Matter is anything with mass and a volume.  Matter is made up of atoms.  Atoms make up molecules and compounds.  Molecules and compounds make up mixtures and pure substances.  Mixtures are either homogeneous or heterogenous.