Warm Up – 9/18 1. What are the types of pure substances? 2. What is the difference between an element and a compound?
Jan 06, 2018
Warm Up – 9/18
1. What are the types of pure substances?
2. What is the difference between an element and a compound?
2.3 Mixtures UNIT 2 Matter and Change
Mixtures vs. CompoundsAll Matter
Pure Substance
Element Compound
Mixture- Made up of only 1
kind of matter- Has uniform and definite composition
- simplest
form- cannot
be divided
- 2 or more different elements
chemically combined
- 2 or more pure substances physically blended together
Element Compound
Mixture
Compounds vs Mixtures
1. Create a new form of matter with unique properties
2. Fixed/definite compositionEx: Aspirin is always 60% Carbon, 35.5% Oxygen and 4.5% Hydrogen.
3. Can only be separated be a chemical change Color, size, solubility, odor,
density, freezing, melting, or boiling points
1. Combine properties of its parts Ex: Red + White = pink
2. Ratio between parts can varyEx: Concrete may be 90% sand or 85% or even 1%
3. Can be separated by physical properties
Mixtures vs. CompoundsAll Matter
Pure Substance
Element
Compound
Mixture
Homogenous
Heterogenous
Homogeneous Mixtures have a uniform composition throughout
Ex: gasoline, syrup, air and metal alloys like gold, steel or brass
Homogeneous mixtures are also called solutions
Heterogeneous Mixtures are not uniform in composition
Ex: orange juice, chocolate chip cookies, lucky charms, Italian dressing, salads
Homogeneous or Heterogeneous?
Phases A uniform part with the same
properties Since Homogeneous mixtures are
uniform throughout they only have 1 part or phase
Heterogeneous mixtures have 2 or more distinct parts or phases
For separating liquids… use DISTILLATION
For separating liquids from solids…use FILTRATION
PracticePure Substance or Mixture? 1. Air 2. cobalt 3. Carbon Dioxide 4. Salt water 5. granite 6. Raisin Bran cereal
PracticeHomogeneous or Heterogeneous? 1. Blood 2. Apple 3. Oil and water 4. Raisin Bran 5. Granite 6. Tea