1. Classifying matter
Ch. 2

2. An compound is an example of a pure substance
True
False
Statement
An compound is an example of a pure substance
Heterogeneous mixtures are the same throughout
Colloids scatter light, and an example is fog
Suspensions are mixtures that will separate into layers
Sugar and water is a homogeneous solution

3. Pure Substances - matter that always has the same composition
Every sample of the substances always has to same properties
Uniform composition, fixed properties

4. Elements Cannot be broken down into simple substances
Contains only 1 type of atom(smallest particle of an element)
Symbols
1st letter always capitalized, 2nd never
Same globally
Ex:

5. Compounds Substance made of 2 or more simpler substances
Can be broken down into simpler substances
Properties differ from the elements in which its made
Has a fixed proportion
Ex:

6. Mixtures Retain some properties of individual substances
Composition is not fixed

7. Mixtures Different types of substances Unevenly mixed
Heterogeneous
Homogenous
Different types of substances
Unevenly mixed
Appears to be only 1 substance
Evenly mixed

8. Solution Homogenous Mixtures
Particles are too small- to settle out, to be trapped by filter, or scatter light
Ex:

9. Suspension Heterogeneous Mixtures Separates into layers over time
Particles are trapped by filters, and can scatter light
Ex:

10. Colloid Heterogeneous Mixture Particles never settle out
Scatter light= Tyndall Effect
Ex:

13. Physical properties
Ch. 2.2

14. The greater the viscosity, the faster a substance moves
True
False
Statement
The greater the viscosity, the faster a substance moves
Malleability is the ability to be hammered without shattering
Physical changes don’t change the substance, and can be reversed
Distillation separates substances based on melting points
Physical properties help us choose materials to use

15. Physical Properties Characteristics of matter
Observed/ measured without changing the composition

16. Physical Properties Resistance to flow High viscosity= slow
Conductivity
Resistance to flow
High viscosity= slow
Low viscosity= fast
Decreases with heat
Ability for heat to flow
High conductivity= conductors

17. Physical Properties Ability to be hammered without shattering
Malleability
Hardness
Ability to be hammered without shattering
Ability to scratch another surface
Diamond- hardest known material

18. Physical Properties Temp. which solid turn liquid- melting point
Melting/Boiling Points
Density
Temp. which solid turn liquid- melting point
Temp. which liquid turns gas- boiling point
Test purity of a substance

19. Using Physical Properties
ID Materials
1-decide which properties to test
2-test the sample of unknown
3- compare results to known
Choose Materials
Look at properties for specific uses

20. Using Physical Properties
Filtration
Process that separates materials based on particle
Distillation
Process that separates substances based on boiling points

21. Physical Change Properties change
Substances materials remain the same!

22. 2.3
Chemical Properties

23. Flammability is the ability to burn in the presence of nitrogen
True
False
Statement
Flammability is the ability to burn in the presence of nitrogen
Change in color is a chemical change
Formation of a solid is a precipitate
Chemical changes alter the composition of the original substance
Rust is an example of a chemical change

24. Chemical Properties
Ability to produce a change in the composition of matter
1 substance changes into another

25. Chemical Properties Ability to burn in presence of oxygen
Flammability
Reactivity
Ability to burn in presence of oxygen
How readily a substance combines chemically with other substances

26. Chemical Change
1 substances reacts with another to form 1 or more new substances

27. Signs of Chemical Change
Color Change-
Production of Gas-
Formation of Precipitate-