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SIGNS OF CHEMICAL RXNS A) New substance made: Color change smell change

SIGNS OF CHEMICAL RXNS A) New substance made: Color change smell change 3) Gas produced - bubbles or smoke 4) Change of state - a solid might form in a liquid B) Energy released:

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SIGNS OF CHEMICAL RXNS A) New substance made: Color change smell change

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  1. SIGNS OF CHEMICAL RXNS • A) New substance made: • Color change • smell change • 3) Gas produced - bubbles or smoke • 4) Change of state - a solid might form in a liquid • B) Energy released: • 5) temperature change - may get hotter (exothermic) OR colder (endothermic)= energy absorbed from the env. 6) Light produced • 7) Sound produced

  2. 1. Blue Bottle • Measure 5g Dextrose • Measure 5g NaOH pellets • Add to 250ml water • Place ¼ drop 1% methylene blue • Conical flask • Stopper • Shake the flask until NaOH is dissolved • Wait • 2.Foam Column • Potassium Permanganate (flat spoonful) • Squirt of detergent - enough to cover the KMnO4 • 30-50ml of hydrogen peroxide (slowly add) • Gas • Heat released • color change • 3.BurningMagnesium • 2cm of Mg • Hold in tongs • Ignite • Burningsteel wool • Bunsen burner mounted horizontally • Ball of wool • Then spread the wool out • light • change in form • Change in color • light • change in color

  3. Solid Reaction • 1 test tube containing Potassium Iodide • 1 test tube containing Lead Nitrate • Pour the KI into a conical flask • Carefully lower the test tube of PbNO3 into the flask • Place on stopper • Place on balance and zero • Tilt flask to spill the PbNO3 • Endothermic Reaction • 10g Barium Hydroxide • 10g Ammonium Nitrate • Mix two in a 80ml beaker • Stir with glass rod - be careful of the fumes • Measure temperature • change in color • change in state • Conservation of mass • change in color • change in temp • change in state • Ethanol Flare • Splash of Ethanol into the bottom of a 5 gallon water container • Swill to fill container with Ethanol vapour • Ignite at arms length • Carbon Pillar • 40ml white sugar • H2SO4 • Small beaker (80ml) • Enough of the H2SO4 to cover the sugar • Gas formation • change in color • change in state • change in temp • Light • Sound • change in temp

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