Experimenting with Concentrations: A Chemistry Journey
Dive into the world of chemistry experiments exploring concentrations and reactions, from sunflower sprouts to the fascinating iodine clock reaction. Follow the methods, measurements, and predictions in this engaging scientific journey.
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Presentation Transcript
SS K O Sunflower Y Sprout Seed O
Chemistry Chemistry
Alchemy? Alchemy?
Iodine Clock Reaction Iodine Clock Reaction Many ways to do it. Many ways to do it. Easy to see when it finishes. Easy to see when it finishes. Can measure reaction time clearly. Can measure reaction time clearly.
Rate of Reaction Rate of Reaction What will happen if we change the concentration? What will happen if we change the concentration? Will the reaction be faster or slower? Will the reaction be faster or slower? How much? How much? Make a prediction! Make a prediction!
Method Method We will have two solutions, A and B. We will have two solutions, A and B. We will keep B the same for every experiment. We will keep B the same for every experiment. We will change the concentration of A. We will change the concentration of A.
You will make 3 concentrations of A You will make 3 concentrations of A Sample Sample Volume of A (mL) Volume of A (mL) Volume of Water (mL) Volume of Water (mL) Volume of Starch (mL) Volume of Starch (mL) A1 A2 A3 5 10 15 15 10 5 2 2 2 Please measure carefully, using Please measure carefully, using
Please Please measure measure Using a Using a A A Water Water Starch Starch 10mL 10mL 50mL 50mL 2mL 2mL Pipette Pipette Metric Glass Metric Glass Measuring Cylinder Measuring Cylinder Which looks Which looks like like
Please measure 10mL of B using Please measure 10mL of B using A 10mL Metric Glass A 10mL Metric Glass
Add 10mL of B to A1 and start the timer. Add 10mL of B to A1 and start the timer. Stop the timer when the mixture changes Stop the timer when the mixture changes colour Write down the time. Write down the time. Repeat for A2 and A3. Repeat for A2 and A3. colour. .
Experiment Time! Experiment Time!
Results Results Was your prediction right? Was your prediction right? Did the results match it? Did the results match it? Make a graph with your results! Make a graph with your results!
Challenge Time! Challenge Time! I want you to make a reaction that takes (X) seconds!! I want you to make a reaction that takes (X) seconds!! Use your graph! Use your graph! Make a solution using your results! Make a solution using your results!
Lets test it! Let s test it!
Concentration and Rate of Reaction Concentration and Rate of Reaction Increasing concentration increases rate of reaction. Increasing concentration increases rate of reaction. If concentration doubles, the rate doubles! If concentration doubles, the rate doubles! Our graph shows time and volume Our graph shows time and volume But the slope, shows But the slope, shows how the rate changes! how the rate changes!
Cleaning up! Cleaning up! Conical Beakers Beakers of A, B and Starch Measuring Cylinder, Metric Glass and Pipette - -Empty into the sink. Empty into the sink. - -Wash with water. Wash with water. - -Dry Dry with paper. with paper. - -Put in tray. Put in tray. - -Do not empty. Do not empty. - -Do Do not wash. not wash. - -Put in tray. Put in tray. - -Do not wash. Do not wash. - -Put in tray. Put in tray.
