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12/15/14 Morning Review Please pull out study guide and a piece of paper to take notes. We’ll start at 7:05. You may grab a treat if you’d like one
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Finals 100 ?’s scan tron 85 minutes to take test
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Chemistry Review Concepts Matter Measuring Changes States Solutions pH
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2.1 Describing Matter 1.Classify matter in terms of elements, compounds and mixtures Element = a pure substance that cannot be broken down into any other substance
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Elements
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2.1 Describing Matter 1.Classify matter in terms of elements, compounds and mixtures 6. What are elements, and how do they relate to compounds? Element = a pure substance that cannot be broken down into any other substance Compound = a pure substance made of 2+ elements chemically combined (can’t physically separate) Mixtures = 2+ substances are combined physically
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Element Check Are the following elements? – Aluminum (Al) – Copper (Cu) – Oxygen (O 2 ) – Water (H 2 O)
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REVIEW ELEMENT vs COMPOUNDS Nickel (Ni) Silver (Ag) Glass (SiO) Neon (Ne) Hydrogen (H 2 )
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2.1 Describing Matter 1.Classify matter in terms of elements, compounds and mixtures 7. What are the properties of a mixture? Element = a pure substance that cannot be broken down into any other substance Compound = a pure substance made of 2+ elements chemically combined (can’t physically separate) Mixtures = 2+ substances are combined physically
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2.1 Describing Matter 2. Classify matter as being homogeneous or heterogeneous 8. What is the difference between a heterogeneous and homogeneous mixture? Homogeneous = evenly mixed, can’t see parts Ex: salt water Heterogeneous = unevenly mixed, can pick out pieces Ex: Chex Mix
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E, C or Mixture (He or Ho) 9. What is the difference between an element, compound and mixture? Give examples: Copper (Cu) Water (H2O) Mixed Salad Salt (NaCl) Carbon (C ) Air Kool aid Sugar
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E, C or Mixture (He or Ho) Copper (Cu) - ELEMENT Water (H2O) - COMPOUND Mixed Salad - HETEROGENEOUS Salt (NaCl) - COMPOUND Carbon (C ) - ELEMENT Air - HOMOGENEOUS Kool aid - HOMOGENEOUS Sugar - COMPOUND
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2.1 Describing Matter 4. Determine physical and chemical properties of matter 5. What kinds of properties are used to describe matter PHYSICAL PROPERTY = Can change its appearance physically CHEMICAL PROPERTY = Can change what it is made up of (can change the atoms to make a new thing); can react
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WARM UP 8.14, answer if the examples are physical or chemical properties Write the property and then write PP or CP Tear-able paper Flammable Breakable Boiling point Ability to dissolve Ability to rust Physical property Chemical property Physical property
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Put the following properties under the correct description: (24 properties) Volume Flammable Can rust Density Malleability Flexible Floats Mass Magnetic Boiling point Freezing point Bouncy Can tarnish Corrosive Melting point State of matter Color Reactive Soluble pH Evaporates Reacts w/ water Conducts heat Conducts electricity Smell Viscosity
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Put the following properties under the correct description: (24 properties) Volume Flammable Can rust Density Malleability Flexible Floats Mass Magnetic Boiling point Freezing point Bouncy Can tarnish Corrosive Melting point State of matter Color Reactive Soluble pH Evaporates Reacts w/ water Conducts heat Conducts electricity Smell Viscosity
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2.2 Measuring Matter 1. Units for measurements 2. Scientific tools used to determine measurements Mass Volume Density Length Temperature
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2.2 Measuring Matter 1. Units for measurements Mass = grams, mg, kg (scale or triple beam balance) Volume = cm 3 (LxWxH); mL (beaker, graduated cylinder); cm 3 water displacement Density = g/mL or g/cm 3 Length = meters, km, cm (ruler) Temperature = °C (thermometer)
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2.2 Measuring Matter 3. Volume Cube Liquid Irregular shape
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2.2 Measuring Matter 4. Density Density = amount of matter per space occupied D = M/V
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Density 1.Mass of an object is 400 g and the volume is 100 mL, what is the density? 2.Mass of the object is 400 g and the density is 10 g/mL, what is the volume? 3.Volume of the object is 10 cm 3 and the density is 10 g/cm 3, what is the mass?
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2.3 Changes in Matter 1.& 2. What is a PC & CC? PHYSICAL CHANGE = an actual change to an object that does not change the chemical make up (arrangement of atoms) EX: state of matter change size change shape change CHEMICAL CHANGE = a new substance has formed EX: OCPGT
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What are the 5 evidences of a CC? O C P G T Osos Can Produce Grande Turds Odor Color Change Precipitate Gas Produced Temperature Change
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2.3 Changes in Matter Cutting wood Breaking glass Burnt smell produced Boiling water The bag got hotter when mixed Food coloring was added A solid formed when the acid was mixed
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2.3 Changes in Matter Cutting wood - PHYSICAL Breaking glass - PHYSICAL Burnt smell produced - CHEMICAL Boiling water - PHYSICAL The bag got hotter when mixed - CHEMICAL Food coloring was added - PHYSICAL A solid formed when the acid was mixed - CHEMICAL
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3.2 Changes of State
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1. 2. 3. Substance during phase changes
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3.2 Changes of State 4. Are changes in state a physical or chemical property? Does it change into a new substance? Ice liquid water steam
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7.1 Understanding Solutions 1.What are the two parts of a solution? Solution = a well mixed mixture containing a solvent and at least one solute that has the same properties throughout Solvent = the part of the solution that is present in the largest amount; dissolves Solute = The part of the solution in the lesser amount; Gets dissolved
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What’s a solvent & solute? WaterSugar & lemon SOLVENT SOLUTE
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Examples Water Salt AirOxygen and other gases WaterCarbon Dioxide SOLVENTSOLUTE You SOLUTE the SOLVENT
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7.2 Concentration and Solubility 1.Why is solubility useful in identifying substances? Solubility = a measure of how much solute can dissolve in a given solvent at a given temperature So if I keep adding sugar to my kool aid mix, will it ever get to a point where it stops dissolving? Each substance has it’s own point where it reaches maximum ability to dissolved and becomes saturated
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7.2 Concentration and Solubility 2. What factors affect solubility? Concentration of solvent Concentration of solute Temperature Rate of stirring Catalyst
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7.3 &.4 Describing Acids and Bases 1.What are the properties of acids & bases? Acids = range from 0-6; taste sour; turn litmus paper red; react with certain metals Ex: citrus, battery acid Bases = range from 8-14; taste bitter; turn litmus paper blue; slippery feel Ex: Ammonia, bleach
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7.3 Acids and Bases 2. & 3. & 4. What does the pH of a solution tell you?
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7.3 Acids and Bases 3. How are the strengths of acids and bases determined? Scales? pH Litmus paper Indicators (bromo blue, phenol red & cabbage juice)
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Questions?
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