This document discusses physical properties and mixtures. It defines pure substances as elements or compounds that have uniform molecules throughout. Elements are pure substances made of one type of molecule, while compounds are pure substances made of different molecule types but with uniform properties. Mixtures are not uniform throughout and contain different molecules and atoms. Homogenous mixtures like solutions appear the same everywhere, while heterogeneous mixtures like cookies or carpet are visibly non-uniform. Chemical changes alter the composition of a substance, unlike physical changes that do not change composition. Chemical properties can be identified through tests of flammability, reactivity, and electrolysis.

1. Physical Properties and
Mixtures
By Jessica
Oct ob er 18, 2012

2. What is a Pure Substance?
Made of Elements and Compounds
Same molecules throughout

3. What is an Element
Type of pure substance
One type of molecule throughout
100 types of elements
Most solid at room temperature
Ex: Mercury (Hg), Oxygen (O)

4. What is a Compound?
Type of pure substance
Different types of molecules
All same properties except one

5. What is a Mixture?
A mixture is matter that is not uniform
throughout
It has different types of molecules and atoms
Different Properties

6. What is a Homogenous
Mixture?
Type of mixture
Looks same throughout
molecules are not uniform
Solutions are Homogenous Mixtures
Ex: salt water, air, ketchup, chicken consommé

7. What is a Heterogenous
Mixture?
Doesn’t look the same throughout
Type of Mixture
Comes from the root hetero meaning different
Ex: cookies, salsa, carpet

8. Evaporation

9. Filtration

10. Distillation

11. What is chemical change?
A change in a substance that changes the
composition of that substance
Flammability, reactivity, reaction with electricity
are chemical properties
Chemical properties can be found using
flammability test, reactivity tests, electrolysis

12. Flammability
How susceptible a substance is to fire
Cannot get original substance back after test
Chemical property test

13. Signs of a Chemical Change
Color change
Formation of a precipitate
Temperature change
Creation of gas
NOT A CHEMICAL CHANGE!!!