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Classification of Matter

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Title: Classification of Matter


1
Classification of Matter
2
Four classes of matter
  • The four classes of matter are elements,
    compounds, mixtures, and solutions

3
Homogeneous matter
  • Appears to look similar throughout
  • Ex salt, sugar, whipped cream
  • all parts are alike (appearance)

4
Question
  • What does the prefix homo mean?
  • Name the four classes of matter.
  • What are the four phases of matter?

5
Question
  • Milk in most stores is homogenized. What do you
    think this means?

6
Heterogeneous matter
  • Matter that has different properties
  • Ex soil, cereal with raisins, concrete

7
Question
  • How is homogeneous matter different from
    heterogeneous matter?

8
Question video
  • Why is it better to classify matter according to
    make-up rather than phase? Think!

9
What is a mixture?
  • A combination of substances
  • Two or more substances that are not chemically
    combined

10
Properties of mixtures
  • The substances in a mixture keep their separate
    identities (properties)
  • Ex salt/pepper, sugar/water

11
Separating mixtures
  • The substances in a mixture can be separated by
    simple physical means
  • Evaporation and filtration are used to separate
    mixtures

12
Types of mixtures (video)
  • Heterogeneous mixtures are the least mixed of
    all mixtures
  • The different particles in mixtures are large
    enough to be seen

13
Homogeneous mixtures
  • Homogenous mixtures are well mixed
  • Particles are small and not easily recognized

14
Question
  • What are two ways mixtures can be separated?

15
Solutions (video)
  • A solution is a mixture in which a substance is
    dissolved in another, best mixed

16
Properties of a solution
  • Particles are not large enough to be seen
  • Evenly spread particles
  • Particles cannot be separated by simple physical
    means

17
Alloys (video)
  • Solutions of metals are alloys
  • Ex gold jewelry, brass, sterling silver,
    stainless steel

18
Questions
  • Describe an alloy.
  • What are two properties of a solution?

19
Pure substances (video)
  • Homogeneous matter is also known as a pure
    substance
  • Properties one kind of material with the same
    properties

20
Elements
  • Simplest types pure substances
  • Made of only one type of atom
  • Cannot be broken down by chemical processes or
    heating

21
What is an atom? (video)
  • The smallest particle of an element that has the
    same properties of the element is the atom

22
Chemical symbols
  • A short way of representing elements
  • Consists of one or two letters
  • An abbreviation for an element

23
Question
  • What are two properties of elements?
  • What is an atom?

24
Compounds (video)
  • Pure substances made of more than one element is
    a compound
  • Ex carbon dioxide, ammonia, sugar

25
Molecules
  • Two or more atoms that are chemically bonded
  • Smallest part of a compound that has the same
    properties of that compound

26
Separating compounds
  • Compounds are made of molecules
  • Compounds can be broken down into simpler
    substances by heating and electricity

27
Questions
  • How is a molecule different from an atom?
  • How is a compound different from an element?

28
Chemical formulas
  • Combinations of chemical symbols are chemical
    formulas (C3H7OH) (NH3)

29
Subscript
  • A subscript is placed to the lower right of the
    chemical symbol
  • It gives the number of atoms of the element

30
Questions
  • How is chemical symbol different from a chemical
    formula?

31
Chemical equations
  • A description of a chemical reaction using
    symbols and formulas is a chemical equation

32
Coefficient
  • The number used to balance a chemical equation
    (coefficient)
  • Balanced means the same number of reactants and
    products

33
Questions
  • How is a subscript different from a coefficient?

34
Chemical reactions
  • Reactants are the substances that enter a
    chemical reaction
  • Products are the substances formed by a chemical
    reaction

35
Chemical equations
  • 2H2O2 (reactants)? 2H2O
  • The arrow means yields (makes)
  • C O2 ? CO2 (products)
  • Reactants (yield) products

36
Questions
  • What does the arrow ? mean in a chemical
    equation?
  • What is a chemical equation?

37
Questions
  • What is another name for a chemical reaction?
  • On what side of a chemical reaction would you
    find the reactants?
  • Products?
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