Elements, Compounds, and Mixtures

ELEMENTS, COMPOUNDS,AND MIXTURESNo warm up, we are jumping right in to this…

but first…

QUIZ!!!Clear Your Desk

Get out a writing utencil

ELEMENTSSo… what is an element?

ELEMENTS• An element is…

• A pure substance• Single kind of matter that has a

specific makeup and properties• Cannot be broken down into any other

substances by physical or chemical means• It is the SIMPLEST of substances!!!

WHEN ELEMENTS COMBINE

• Atom – Basic particle from which all elements are made.• Chemical bond – force of attraction

between two atoms• Molecules – groups of two or more atoms

held together by chemical bonds.

WHEN ELEMENTS COMBINE

•Two atoms of the same type can form a molecule!

•Oxygen we breathe is •Nitrogen in the ground (and air) is

COMPOUNDSWhat is a compound?

COMPOUND• Compound is a pure substance made of

two or more elements chemically combined in a set ratio.• Water = • (2 Hydrogen to 1 Oxygen or 2:1)

• Carbon Dioxide = • (1 Carbon to 2 Oxygen)

• Sugar = (12 Carbon, 22 Hydrogen, 11

Oxygen) …or 12:22:11

COMPOUNDS

“DIATOMIC” MOLECULES

• There are seven elements that form diatomic molecules.

•Hydrogen (H2)•Nitrogen (N2)•Oxygen (O2)• Fluorine (F2)• Chlorine (Cl2)• Iodine (I2)• Bromine (Br2)

MIXTURE

What in the world is a mixture?(and)

What makes it different from a Compound?

MIXTURE•Mixture – Made of two or more substances (elements or compounds or both) that are together in the same place but…

NOT CHEMICALLY COMBINED

MIXTURE

MIXTURES• 2 types of Mixtures•Heterogeneous & Homogeneous

•Heterogeneous = You can see the individual parts•Homogeneous = So evenly mixed you cannot see the individual parts!

MIXTURES

• I want EXAMPLES of Heterogeneous Mixtures!!!

•Now I want EXAMPLES of Homogeneous Mixtures!!!

SEPARATION ANXIETY•How can we separate a mixture?•Manually remove•Magnetic attraction• Filtration•Distillation• Evaporation

REVIEW…The simplest structure that cannot be broken down into any other substances by chemical or physical means is…

1) Mixture2) Compound3) Element4) Substance

REVIEW…A pure substance made of two or more elements chemically combined in a set ratio is called…

1) Mixture2) Compound3) Element4) Substance

REVIEW…This is made of two or more substances that are together in the same place but not chemically combined…

1) Mixture2) Compound3) Element4) Substance

REVIEW…• A mixture where you can see the

individual parts is called…

1) Solution2) Homogeneous Mixture3) Compound4) Heterogeneous Mixture

REVIEW…• A mixture where you cannot see the

individual parts is called…

1) Element2) Homogeneous Mixture3) Compound4) Heterogeneous Mixture