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Elements, Compounds and Mixtures

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Title: Elements, Atoms and Compounds Author: smunn Last modified by: s.munn_daa Created Date: 10/10/2009 9:25:33 AM Document presentation format: On-screen Show (4:3) – PowerPoint PPT presentation

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Title: Elements, Compounds and Mixtures


1
Elements, Compounds and Mixtures
  • Science 10

2
Elements
  • A pure substance that cannot be separated into a
    simpler substance
  • Pure one type of particle called atoms
  • all particles are alike
  • Have unique chemical and physical properties

3
Compounds
  • A pure substance made up of atoms of two or more
    elements joined by chemical bonds
  • Eg. Salt sodium chlorine
  • Water Hydrogen oxygen
  • Carbon dioxide carbon oxygen
  • Can you think of others?

4
Compounds
  • Properties of product are different than
    properties of the elements that make it up
  • Eg. Salt sodium chlorine
  • Sodium reacts violently with water
  • Chlorine is poisonous gas
  • Salt is safe to eat and doesnt explode when
    dissolved in water


?
5
Making compounds
  • WORD EQUATIONS
  • element element ? compound
  • reactant reactant ? product
  • hydrogen oxygen ? water

6
Breaking down compounds
  • compound ? element element
  • compound ? simpler compound
  • Occurs through a chemical change
  • Adding heat energy or electric current

7
Mixtures
  • A combination of two or more substances
    (compounds or elements) that are not chemically
    combined
  • do not react to form a compound
  • No chemical change
  • Each substance keeps its own properties
  • Examples?

8
Mixtures
  • A combination of two or more substances
    (compounds or elements) that are not chemically
    combined
  • do not react to form a compound
  • No chemical change
  • Each substance keeps its own properties
  • Examples?

9
Separating mixtures
  • Physical changes
  • Pick the mushroom off of the pizza
  • Heat salt water until water evaporates leaving
    salt

Centrifuge used to separate red blood cells and
plasma
10
Mixtures solutions
  • Particles from two or more substances distributed
    evenly
  • Appears to be a single substance
  • Solute the substance that dissolves
  • Solvent the substance in which the solute
    dissolves
  • Eg. Sugar in teawhich is which?

11
Mixtures solutions continued
  • Solubility ability of a solute to dissolve in a
    solvent
  • Concentration the amount of solute dissolved in
    a solvent
  • Eg. Potassium permanganate in water
  • Dark purple more particles, higher amount of
    solute
  • Light pink less particles, lower amount of
    solute

12
Mixtures suspensions
  • Mixture where particles are dispersed evenly but
    are large enough to settle out
  • Eg. Snow globe

13
Mixtures colloids
  • Mixture of tiny particles that are bigger than
    those in solutions and smaller than those in
    suspensions
  • Can be liquid, solid or gas and display
    properties of some or all
  • Eg. Jell-o, milk, whipped cream, goop

14
Colloids Making goop
  • Mix 2 parts cornstarch to 1 part water (1/2 cup
    to ¼ cup)
  • Questions
  • - What are some of the physical properties of
    goop?
  • What keeps the goop together like a solid?
  • When does the mixture behave like a liquid?

15
Comparing mixtures and compounds
Table 1 Mixtures and Compounds Table 1 Mixtures and Compounds
Mixtures Compounds
Made of element or compounds or both Made of elements
No change in original properties Change in original properties
Separated by physical changes Separated by chemical changes
Made using any ratio or components Made of a set ratio of components
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