Elements, Compounds, Elements, Compounds, and Mixturesand Mixtures

Pure SubstancesPure Substances

A sample of matter that has definite A sample of matter that has definite chemical and physical propertieschemical and physical properties..

What is an ELEMENT?What is an ELEMENT?o A pure substance A pure substance

containing only one kind of containing only one kind of atom.atom.

o Cannot be separated into Cannot be separated into simpler materials by simpler materials by chemical or physical means.chemical or physical means.

o Over 100 existing elements Over 100 existing elements are listed and classified on are listed and classified on the Periodic Tablethe Periodic Table

What is a COMPOUND?What is a COMPOUND?o A pure substance containing A pure substance containing

two or more kinds of different two or more kinds of different elementselements

o The atoms are chemically The atoms are chemically combined in some waycombined in some way

o Compounds cannot be separated by Compounds cannot be separated by physical means, separating a physical means, separating a compound requires a chemical reactioncompound requires a chemical reaction

o Properties of a compound are usually Properties of a compound are usually different than the properties of the different than the properties of the elements it containselements it contains

What is a MIXTURE?What is a MIXTURE?o Two or more elements or Two or more elements or

compounds NOT chemically compounds NOT chemically combinedcombined

o Can be uniform called Can be uniform called homogeneoushomogeneous and are and are known as solutionsknown as solutions

o Can also be non-uniform called Can also be non-uniform called heterogeneousheterogeneous

o Can be separated into their Can be separated into their components by chemical or physical components by chemical or physical meansmeans

Element, Compound or Element, Compound or Mixture?Mixture?

MixtureMixture

Element, Compound or Element, Compound or Mixture?Mixture?

CompoundCompound

Element, Compound or Element, Compound or Mixture?Mixture?

MixtureMixture

Element, Compound or Element, Compound or Mixture?Mixture?

ElementElement

Element, Compound or Element, Compound or Mixture?Mixture?

MixtureMixture

Element, Compound or Element, Compound or Mixture?Mixture?

ElementElement

Can you identify the following?Can you identify the following?

You will be shown a series of photos. Tell if each You will be shown a series of photos. Tell if each photo represents an item composed of an photo represents an item composed of an element, compound, or mixture.element, compound, or mixture.

Review:Review:An An elementelement contains just one type of atom. contains just one type of atom. A A compoundcompound contains two or more different contains two or more different atoms joined together. atoms joined together. A A mixturemixture contains two or more different contains two or more different substances that are only physically joined substances that are only physically joined together, not chemically.together, not chemically.

– A mixture can contain both elements and compoundsA mixture can contain both elements and compounds

Element, Compound, or Mixture?Element, Compound, or Mixture?

RocksRocks

Element, Compound, or Element, Compound, or MixtureMixture??

RocksRocks

Element, Compound, or Mixture?Element, Compound, or Mixture?

CopperCopper

ElementElement, Compound, or Mixture?, Compound, or Mixture?

CopperCopper

Element, Compound, or Mixture?Element, Compound, or Mixture?

Jelly BeansJelly Beans

Element, Compound, or Element, Compound, or MixtureMixture??

Jelly BeansJelly Beans

Element, Compound, or Mixture?Element, Compound, or Mixture?

Table SugarTable Sugar

Element, Element, CompoundCompound, or Mixture?, or Mixture?

Table SugarTable Sugar

Element, Compound, or Mixture?Element, Compound, or Mixture?

DiamondDiamond

ElementElement, Compound, or Mixture?, Compound, or Mixture?

DiamondDiamond

Element, Compound, or Mixture?Element, Compound, or Mixture?

TeaTea

Element, Compound, or Element, Compound, or MixtureMixture??

TeaTea

Element, Compound, or Mixture?Element, Compound, or Mixture?

SaltSalt

Element, Element, CompoundCompound, or Mixture?, or Mixture?

SaltSalt

Element, Compound, or Mixture?Element, Compound, or Mixture?

Neon GasNeon Gas

ElementElement, Compound, or Mixture?, Compound, or Mixture?

Neon GasNeon Gas

Element, Compound, or Mixture?Element, Compound, or Mixture?

SaladSalad

Element, Compound, or Element, Compound, or MixtureMixture??

SaladSalad

Element, Compound, or Mixture?Element, Compound, or Mixture?

Pure WaterPure Water

Element, Element, CompoundCompound, or , or Mixture?Mixture?

Pure WaterPure Water

Element, Compound, or Element, Compound, or Mixture?Mixture?AluminumAluminum

ElementElement, Compound, or , Compound, or Mixture?Mixture?AluminumAluminum

Element, Compound, or Element, Compound, or Mixture?Mixture?

LemonadeLemonade

Element, Compound, or Element, Compound, or MixtureMixture??

LemonadeLemonade

Element, Compound, or Element, Compound, or Mixture?Mixture?

SilverSilver

ElementElement, Compound, or , Compound, or Mixture?Mixture?

SilverSilver

Element, Compound, or Element, Compound, or Mixture?Mixture?

SandSand

Element, Compound, or Element, Compound, or MixtureMixture??

SandSand