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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 What does the prefix “homo” mean?Name the four classes of matter. What are the four phases of matter?
Milk in most stores is homogenized. What do you think this means?Question Milk in most stores is homogenized. What do you think this means?
Matter that has different properties Heterogeneous matter Matter that has different properties Ex: soil, cereal with raisins, concrete
Question How is homogeneous matter different from heterogeneous matter?
Question video Why is it better to classify matter according to make-up rather than phase? Think!
What is a mixture? A combination of substances Two or more substances that are not chemically combined
Properties of mixturesThe substances in a mixture keep their separate identities (properties) Ex: salt/pepper, sugar/water
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)Heterogeneous mixtures are the “least mixed” of all mixtures The different particles in mixtures are large enough to be seen
Homogeneous mixtures Homogenous mixtures are “well mixed” Particles are small and not easily recognized
Question What are two ways mixtures can be separated?
Solutions (video) A solution is a mixture in which a substance is dissolved in another, “best mixed”
Properties of a solutionParticles are not large enough to be seen Evenly spread particles Particles cannot be separated by simple physical means
Alloys (video) Solutions of metals are alloys Ex: gold jewelry, brass, sterling silver, stainless steel
Questions Describe an alloy. What are two properties of a solution?
Pure substances (video)Homogeneous matter is also known as a pure substance Properties: one kind of material with the same properties
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) The smallest particle of an element that has the same properties of the element is the atom
Chemical symbols A short way of representing elements Consists of one or two letters An abbreviation for an element
Question What are two properties of elements? What is an atom?
Compounds (video) Pure substances made of more than one element is a compound Ex: carbon dioxide, ammonia, sugar
Molecules Two or more atoms that are chemically bondedSmallest part of a compound that has the same properties of that compound
Separating compounds Compounds are made of molecules Compounds can be broken down into simpler substances by heating and electricity
Questions How is a molecule different from an atom? How is a compound different from an element?
Combinations of chemical symbols are chemical formulas (C3H7OH) (NH3)
Subscript A subscript is placed to the lower right of the chemical symbol It gives the number of atoms of the element
Questions How is chemical symbol different from a chemical formula?
Chemical equations A description of a chemical reaction using symbols and formulas is a chemical equation
Coefficient The number used to balance a chemical equation (coefficient) “Balanced” means the same number of reactants and products
Questions How is a subscript different from a coefficient?
Chemical reactions Reactants are the substances that enter a chemical reaction Products are the substances formed by a chemical reaction
Chemical equations 2H2+O2 (reactants) 2H2OThe arrow means yields (makes) C + O2 CO2 (products) Reactants (yield) products
Questions What does the arrow mean in a chemical equation? What is a chemical equation?
Questions What is another name for a chemical reaction?On what side of a chemical reaction would you find the reactants? Products?
Mixtures, Elements and Compounds
Mixtures and Pure Substances
Chapter 4 P Mixtures, Elements and Compounds.
Pure substance Only one kind of material
Matter and Change Ch. 2.
Elements, Compounds, and Mixtures. What are the basic differences? Element Any substance that contains only one kind of atom Cannot be broken down Compound.
CLASSIFICATION OF MATTER. Pure Substances: Contain only 1 type of material Cannot be separated by physical means (filtration, etc.) Mixtures: Elements:
Pure Substances Mr. Skirbst Physical Science Topic 12.
Section 2: Combinations of Atoms
A Matter of Fact.
Classification of Matter
Classifying Matter Mixtures, Elements and Compounds.
A Matter of Fact Mixtures, Elements and Compounds.
Elements, Compounds and Mixtures
Chapter 1: The Puzzle of Matter Chemistry explains the structure, composition and behavior of matter. Matter is anything that takes up space and has mass.
Chem 11. Indications of a chemical reaction Energy absorbed or released Color change Gas produced Precipitate- solid that separates from solution Not.
Chapter 1-3: Classifying Matter. Matter Anything that has volume and mass All matter is composed of atoms –An atom is the smallest unit of an element.
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