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Chemical Reactions

Chemical Reactions. 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)

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Chemical Reactions

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  1. ChemicalReactions

  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 and heat • color change • reversible reactions • 3.BurningMagnesium • 2cm of Mg • Hold in tongs • Ignite • Burningsteel wool • Bunsen burner mounted horizontally • Ball of wool • Then spread the wool out • light and change in form; new substance • change in color; new substance

  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 • 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/fire • change in temp

  4. SUMMARY • From the 8 demos, the following are signs of a chemical reaction: • These signs are seen in the …. (cite examples from the demos)

  5. Assessment

  6. SIGNS OF CHEMICAL RXNS Color change - new substances might reflect different colors of light. Heat change - the container may get hotter or colder. Gas produced - bubbles or smoke may be observed. Precipitate formed - an insoluble solid might form in a liquid.

  7. Reactants Products

  8. Parts of a rxn:

  9. A + B C FORM C A+ B SEPARATE SWITCH 1 A + BX AX + B AX + BYAY+ BX SWITCH 2

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