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Investigation 14: Reaction Rates and Equilibrium

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Rates of Reaction and Dissolution

Performance Assessment

In this lab experience, students carry out an investigation to determine how reaction rate changes based on reactant concentration and temperature. Students should come to understand that as the concentration of hydrogen peroxide is decreased, the reaction rate decreases. Also, when the temperature of the sodium acetate solution increases, the rate of dissolution increases.

Materials Included in Kit

Consumable:
Laboratory detergent, 200 g
Hydrogen peroxide, H2O2, 10% solution, 840 mL
Hydrogen peroxide, H2O2, 30% solution, 140 mL
Sodium acetate trihydrate, 250 g
Sodium iodide solution, 2 M, 105 mL
Additional Materials Required
Beakers, Borosilicate Glass, 50-mL, 10
Beakers, Borosilicate Glass, 250-mL, 10
Cylinder, Borosilicate Glass, 10 mL, 10
Cylinder, Borosilicate Glass, 50 mL, 10
Cylinder, Borosilicate Glass, 100 mL, 10
DLAB Classic Magnetic Stirrer/Hot Plate, 10
Flinn Digital Thermometer, 10
Student Timer, 12-pack, 1
Wax Pencil Set, Heat Resistant, 4

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Reaction Rates: Iodine Clock

In this lab experience, students carry out an investigation to determine how the rate of the iodine clock reaction is affected by the concentration of reactants involved. With this reaction students should come to understand that increasing the concentration of potassium iodate decreases the reaction time. Also, for the advanced version, increasing the temperature also decreases the reaction time.

Materials Included in Kit

Consumable:
Potassium iodate solution, 0.2 M, 2.4 L
Starch, soluble, potato, 52 g
Sodium metabisulfite, 32 g
Cups, clear plastic, 10 oz, package of 50
Additional Materials Required
Beakers, Borosilicate Glass, 400-mL, 60
Cylinder, Borosilicate Glass, 100 mL, 40
Cylinder, Borosilicate Glass, 250 mL, 40
DLAB Classic Magnetic Stirrer/Hot Plate, 10
Flinn Digital Thermometer, 10
Stirring Rods, Glass, 10
Student Timer, 12-pack, 1
Bottles, Washing, Polyethylene, 250-mL, 10

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Collision Theory

In this lab experience, students carry out an investigation to determine what leads to a successful collision between particles in a chemical reaction. “Particles” will be “collided” to determine the effects of concentration on the success rate of collisions. Students should come to understand that increasing the concentration of particles increases the success rate of collisions. Also, increasing the temperature of the particles increases the success rate of collisions.

Materials Included in Kit

Non-Consumable:
Expanded polystyrene spheres, 2 in diameter, 48
Expanded polystyrene spheres, 1.5 in diameter, 48
Hook and loop fastener dots, 48
Magnetic marbles, 32
Pom poms, black, package of 50
Pom poms, red, package of 50
String, cotton, ball
Additional Materials Required
Student Timer, 12-pack, 1

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Explore Chemical Equilibrium

In this lab experience, students will carry out an investigation to observe changes in equilibrium when the amount of reactants and temperature are changed. Students should come to understand how changing temperature and changing the amount of reactants affects an equilibrium.

Materials Included in Kit

Consumable:
Bromocresol green indicator, 0.04%, 35 mL
Iron(III) nitrate solution, 0.1 M, 75 mL
Hydrochloric acid, 0.1 M, 75 mL
Potassium thiocyanate solution, 0.1 M, 75 mL
Sodium hydroxide solution, 0.5 M, 75 mL
Pipets, 60
Additional Materials Required
Beakers, Borosilicate Glass, 50 mL, 10
Beakers, Borosilicate Glass, 250 mL, 20
Beakers, Borosilicate Glass, 400 mL, 20
DLAB Classic Magnetic Stirrer/Hot Plate, 10
Flinn Digital Thermometer, 10
Stirring Rods, Glass, 10
Test Tubes without Rims, Disposable, 13 x 100 mm, Pkg. of 250, 1
Wax Pencil Set, Heat Resistant, 4

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Use Equilibrium for a Commercial Application

Engineering Design Challenge

In this lab experience, students are challenged to devise a method to increase the amount of carbon dioxide in seltzer water. Students will discover that increasing pressure and cooling the solution causes a shift where more carbon dioxide can dissolve in the solution. For best results, pressure and cooling, together, gives the most color change. In the higher levels, students will also relate this phenomena to real-world problems and manufacturing.

Materials Included in Kit

Consumable:
Acetic acid, 1 M, 540 mL
Bromcresol green indicator solution, 0.04%, 75 mL
Seltzer water, 8 oz bottles, 3
Sodium bicarbonate, 100 g
Balloons, 12”, package of 20
Pipets, 20
Non-Consumable:
Syringes, 35 mL, 30
Syringe tip cap, 30
Bromcresol green indicator charts, 5
Additional Materials Required
Beakers, Borosilicate Glass, 50-mL, 10
Beakers, Borosilicate Glass, 250-mL, 10
DLAB Classic Magnetic Stirrer/Hot Plate, 10
Flask, Erlenmeyer, Borosilicate Glass, 125 mL, 20