Chapter 2 matter and change
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Chapter 2 matter and change






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Chapter 2 matter and change Chapter 2 matter and change Presentation Transcript

  • START IT UP PUP Chapter 2 Matter and Change Unit Notes
  • Section 2.1 Properties of Matter What is matter?
  • Which of these is matter? water air light darkness smoke human cold diamond heat jello cloud sound
  • What is matter? Matter is anything that has mass and takes up space.  Matter can be classified by extensive or intensive properties.  Extensive depends on the amount of matter in the sample.  Intensive does not depend on the amount but the type of matter in the sample. 
  • What is a substance? Matter that has a uniform and definite composition is called a substance.  Examples are: gold, copper, iron, water, sodium chloride (salt), oxygen (see table 2.1)  Physical properties can be used to identify unknown substances. 
  • States of Matter  The three main states of matter are: solid, liquid and gas.
  • Solids Solids have a definite shape and volume.  The shape of the solid doesn’t depend on the shape of the container.  Solids are incompressible.  Expand slightly when heated.  Particle vibrate in place. 
  • Liquids Indefinite shape  Definite volume  Not easily compressed  Expand slightly when heated.  Particles can flow. 
  • Gases Indefinite shape.  Indefinite volume.  Easily compressed.  Particles are free to roam everywhere. 
  • Vocabulary Cards Matter  Extensive  Intensive  Substance 
  • Yup, yup SUM IT UP SUM IT UP PUP How can you tell if something is matter?
  • Mixtures 2.2 Mixtures are classified into two groups.  Mixtures are physical blends of two or more components.  Heterogeneous mixtures are not uniform. Their components are not evenly distributed.  Homogeneous mixtures are uniform and their components are evenly distributed.  Phases describe any part of a mixture that has uniform composition and properties. 
  • What kind of mixture is it? heterogeneous Homogeneous Homogeneous Homogeneous heterogeneous
  • Elements and compounds 2.3 Compounds can be broken down into simpler substances by chemical means.  Elements cannot.  If the composition of a material is fixed, the material is a substance.  If the composition of a material can vary, it is a mixture.  Chemical symbols are used to represent elements on the periodic table. 
  • Chemical Reactions 2.4       During a chemical change, the composition of matter always changes. A substance present at the start of the reaction is called the reactant. The substance present at the end of the reaction is called the product. Clues that a chemical change has occurred are: energy transfer (hot or cold feeling), change in color, gas production, formation of a precipitate (solid stuff) During any chemical reaction, the mass of the reactants and the products must equal each other. Its called the Law of Conservation of Mass.
  • How can you recognize a physical versus and chemical change? Breaking glass Ice pack Frying an egg Burning a match Rusting car Boiling water Shaking pop Hand warmers Freezing water Cooking macaroni Chopping veggies Baking a cake
  • Vocabulary Cards Mixture  Heterogeneous  Homogeneous  Compound  Element  Reactant  product 
  • SUM IT UP How can you tell if a chemical instead of a physical reaction has taken place?
  • Substance  Matter that has the same composition and properties throughout is called a substance.
  • Compound  A compound is a substance whose smallest unit is made up of atoms of more than one element chemically bonded together.
  • Mixture  When two or more substances (element and compounds) come together but don’t combine to create a new substance, a mixture results.
  • Homogeneous Mixture  These mixtures are the same throughout. You can’t see the different parts.
  • Heterogeneous Mixture  These mixtures are not the same throughout and you can see the individual parts.
  • Which one is it? compound compound mixture mixture mixture compound
  • A chemical reaction must make something totally different that has different properties from when it started. You start with the And you end with the reactants products
  • When you make a sandwich, what do you do?
  • When you make a sandwich, what do you do? Products Reactants
  • SCIENCE SWAG EXTRA CREDIT: Create a video, poem or story about the states of matter. Poem or story must be one page. Video must be 2 minutes. Make sure the projects include good facts about the states of matter. Due in one week.
  • POST IT UP What is the Law of Conservation of Mass? OT IG IS! TH IN EE D HE LP !