Today’s Catalyst1. What is an intensive property of matter? List two examples of intensive properties.   2. What is an extensive property of matter? List two examples of extensive properties.

Do not depend upon the amount of matter present; color, density

Do depend upon the amount of matter present; mass, volume

Today’s Catalyst

3. Compare these two elephants. What would be an intensive property of the elephants? What would be an extensive property of the elephants?

https://www.youtube.com/watch?v=88MBCyiaPSM

Pure Substances and Mixtures

By the end of the class period today I will be able to…Identify a piece of matter as an element, compound, homogeneous, or heterogeneous mixture based upon its properties

Pure SubstancesComposition is the same throughout and

does not vary from sample to sample.

CANNOT be broken down by physical changes

Can be an element or compound.

ElementDefinition: substances in their simplest formsCannot be broken down by a physical or chemical change

Found on the periodic tableMade up of one type of atom

Examples of Elements:HydrogenCarbonLithiumGold

What are two other examples of elements not listed above? What do all elements have in common?

CompoundDefinition: substance formed by the

chemical combination of two or more elementscan be broken into simpler substances by a chemical change

+ = Compound

A compound is always composed of the same elements in the same proportions.

In other words, Carbon Dioxide (CO2) is always composed of 1 atom of C and 2 atoms of O.

If there are different amounts of carbon or oxygen, it is no longer carbon dioxide.

Law of Definite Proportions

More Examples of Compounds

MixtureDefinition: two or more pure substances (elements or compounds) that are mixed together but NOT joined chemicallyNOT a pure substanceExamples: The air we breath, gasoline for cars, the sidewalk on which we walk

Homogeneous MixturesUniform in composition and

appearance

Same proportion of components throughout

Consists of two or more substances in the same phase

Also called solutions

Heterogeneous Mixturesvariable appearance and composition

Raise ‘em Up!Look at the following example and with your partner determine if it is a heterogeneous mixture, homogeneous mixture, element, or compound

Chicken Noodle Soup

Heterogeneous Mixture

Pure Water

Compound

Tap Water

Homogeneous Mixture

Pure Gold

Element

Coca-Cola

Homogeneous Mixture

Kool Aid has mass and takes

up space

Can be separated

by allowing water to

evaporate

Same composition throughout

Wrapping up!In 1-2 STRONG sentences…under your flow-chart…

Why is it DIFFICULT to classify matter??

HOMEWORK!!!Complete the 2-sided Pure Substance and

Mixtures Homework sheet – due tomorrow! We will go over ALL correct answers tomorrow!!

TEST coming THURSDAY SEPTEMBER 17th !!! Covers: Physical/Chemical Properties AND

Changes, States of Matter, and Pure Substances and Mixtures!!