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Mixtures,Elements , Compounds with Physical and Chemical Changes QUIZ REVIEW 2

Mixtures,Elements , Compounds with Physical and Chemical Changes QUIZ REVIEW 2. Today’s Objectives. You will be able to: Compare and contrast mixtures, elements and compounds Compare and contrast heterogeneous and homogeneous mixtures Compare and contrast physical and chemical changes

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Mixtures,Elements , Compounds with Physical and Chemical Changes QUIZ REVIEW 2

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  1. Mixtures,Elements, Compounds with Physical and Chemical Changes QUIZ REVIEW 2

  2. Today’s Objectives • You will be able to: • Compare and contrast mixtures, elements and compounds • Compare and contrast heterogeneous and homogeneous mixtures • Compare and contrast physical and chemical changes • Use states of matter to describe what is happening in a chemical reaction

  3. Agenda • Work on Quiz Review • Review Answers to Quiz Review

  4. Practice Quiz • Work on your Practice Quiz alone with no worksheets or notebooks. • Your completed Practice Quiz is due at: • Show me your Exit Slip as your grade will depend on your paper completion and a correct Exit Slip.

  5. Quiz Review Answers • Heterogenousand homogeneous • Elements and compounds are the 2 types of pure substances • C the composition of a mixture can vary; pure substances have a fixed comp. • B ahomog. mixture has a uniform comp, 1 phase • C a homogeneous mixture • B salt and water can be separated by a physical process 2 Points EACH!

  6. Quiz Review Answers • C distillation is a way to separate some mixtures (2pts) • homog. has 1 phase heterog. has 2 or more phases (2 pts) 9. a) hetereog.b) homog. (.5 point each) c) homog. d) heterog. • Distillation is used to B separate mixtures by boiling points. (2pts)

  7. Quiz Review Answers • Mixtures - A physical process • Compounds - B chemically • Elements - D nuclear reaction • D compounds can be broken down chemically, but elements can not • C Salt is isolated from seawater by evaporation • D sugar crystals dissolving in water 2 POINTS EACH

  8. Quiz Review Answers (.5 Point for all these!) 17. pudd:MIXbery: ELE air: MIX CO2: COM nit:ELE water:COMmilk:MIXs&m:MIXLi:ELENaOH:COM juice:MIX V:ELENaCl: COMKool-Aid:MIXsaltw:MIX 18. Milk souring: CHEMCH4 + O2 CO2 + H2O : CHEM crushing peanuts: PHYS melting ice: PHYS burning a candle: CHEM water evaporating: PHYS

  9. Quiz Review Answers 19. a) water boiling is a physical change b) cooking sausage is a chemical change 20.HCl(aq) + NaHCO3(aq) NaCl(aq) + H2O(l) + CO2(g) ReactantsProducts 21. C NaCl dissolved in water to make a solution • B aqueous • A solid • C gas 2 Points each problem

  10. Quiz Review Answers 25. B liquid • C a solid dissolving (2 points each) Exit Slip: Equation A is a chemical change because the formulas/compounds all change to different compounds. Equation B is a physical change because the CaO and H2O do not change to anything else.

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