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Classification of Matter. Four classes of matter. The four classes of matter are elements, compounds, mixtures, and solutions. Homogeneous matter. Appears to look similar throughout Ex: salt, sugar, whipped cream all parts are alike (appearance). Question.

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Presentation Transcript
four classes of matter
Four classes of matter
  • The four classes of matter are elements, compounds, mixtures, and solutions
homogeneous matter
Homogeneous matter
  • Appears to look similar throughout
  • Ex: salt, sugar, whipped cream
  • all parts are alike (appearance)
question
Question
  • What does the prefix “homo” mean?
  • Name the four classes of matter.
  • What are the four phases of matter?
question5
Question
  • Milk in most stores is homogenized. What do you think this means?
heterogeneous matter
Heterogeneous matter
  • Matter that has different properties
  • Ex: soil, cereal with raisins, concrete
question7
Question
  • How is homogeneous matter different from heterogeneous matter?
question video
Question video
  • Why is it better to classify matter according to make-up rather than phase? Think!
what is a mixture
What is a mixture?
  • A combination of substances
  • Two or more substances that are not chemically combined
properties of mixtures
Properties of mixtures
  • The substances in a mixture keep their separate identities (properties)
  • Ex: salt/pepper, sugar/water
separating mixtures
Separating mixtures
  • The substances in a mixture can be separated by simple physical means
  • Evaporation and filtration are used to separate mixtures
types of mixtures video
Types of mixtures (video)
  • Heterogeneous mixtures are the “least mixed” of all mixtures
  • The different particles in mixtures are large enough to be seen
homogeneous mixtures
Homogeneous mixtures
  • Homogenous mixtures are “well mixed”
  • Particles are small and not easily recognized
question14
Question
  • What are two ways mixtures can be separated?
solutions video
Solutions (video)
  • A solution is a mixture in which a substance is dissolved in another, “best mixed”
properties of a solution
Properties of a solution
  • Particles are not large enough to be seen
  • Evenly spread particles
  • Particles cannot be separated by simple physical means
alloys video
Alloys (video)
  • Solutions of metals are alloys
  • Ex: gold jewelry, brass, sterling silver, stainless steel
questions
Questions
  • Describe an alloy.
  • What are two properties of a solution?
pure substances video
Pure substances (video)
  • Homogeneous matter is also known as a pure substance
  • Properties: one kind of material with the same properties
elements
Elements
  • Simplest types pure substances
  • Made of only one type of atom
  • Cannot be broken down by chemical processes or heating
what is an atom video
What is an atom? (video)
  • The smallest particle of an element that has the same properties of the element is the atom
chemical symbols
Chemical symbols
  • A short way of representing elements
  • Consists of one or two letters
  • An abbreviation for an element
question23
Question
  • What are two properties of elements?
  • What is an atom?
compounds video
Compounds (video)
  • Pure substances made of more than one element is a compound
  • Ex: carbon dioxide, ammonia, sugar
molecules
Molecules
  • Two or more atoms that are chemically bonded
  • Smallest part of a compound that has the same properties of that compound
separating compounds
Separating compounds
  • Compounds are made of molecules
  • Compounds can be broken down into simpler substances by heating and electricity
questions27
Questions
  • How is a molecule different from an atom?
  • How is a compound different from an element?
chemical formulas
Chemical formulas
  • Combinations of chemical symbols are chemical formulas (C3H7OH) (NH3)
subscript
Subscript
  • A subscript is placed to the lower right of the chemical symbol
  • It gives the number of atoms of the element
questions30
Questions
  • How is chemical symbol different from a chemical formula?
chemical equations
Chemical equations
  • A description of a chemical reaction using symbols and formulas is a chemical equation
coefficient
Coefficient
  • The number used to balance a chemical equation (coefficient)
  • “Balanced” means the same number of reactants and products
questions33
Questions
  • How is a subscript different from a coefficient?
chemical reactions
Chemical reactions
  • Reactants are the substances that enter a chemical reaction
  • Products are the substances formed by a chemical reaction
chemical equations35
Chemical equations
  • 2H2+O2 (reactants) 2H2O
  • The arrow means yields (makes)
  • C + O2  CO2 (products)
  • Reactants (yield) products
questions36
Questions
  • What does the arrow  mean in a chemical equation?
  • What is a chemical equation?
questions37
Questions
  • What is another name for a chemical reaction?
  • On what side of a chemical reaction would you find the reactants?
  • Products?