2. Indiana Standard Indicator Science 3.6.5 Observe that and describe how some changes are very slow and some are very fast and that some of these changes may be hard to see and/or record
3. Definitions Chemical Reaction : Process that leads to the transformation of one set of chemical substances to another. Change : To become different Observation: The act of noting and recording something
4. Information When scientists perform experiments they are very careful to record their data , no matter how long or short their observations are. Sometimes changes occur so quickly that they are hard to measure and record. How fast can you blink? How fast snap your fingers? Sometimes changes occur so slowly that it is hard to observe and record. How long does it take for your hair to grow an inch? How long does it take for a tree to grow taller than your house?
5. Activity We are going to look at 3 different chemical reactions. We are going to measure the different speeds that each reaction happens at. The start time is when you place the object in liquid. The stop time is when the reaction change is over. Use a stop watch to measure the reaction time.
6. CUP 1 Pour 100 milliliters of water into clear cup Drop a cold/flu tablet in to cup. Start time once tablet hits water. Stop time once reaction or change is over. Draw and describe the change that took place. Was it a long or short reaction?
7. CUP 2 Pour 100 milliliters of vinegar in to the second clear cup. Put 5 milliliters of baking soda into the vinegar. Draw a picture of the change that occurs. Is it fast or slow?
8. Cup 3 Pour 100 milliliters of water into the last clear cup Place a penny in the bottom of the clear cup. Is there any change? Observe the cup for the next several days. Is the reaction fast or slow? What happened?
9. Closure Activity Write up your finding of each cup. Compare your picture of each cup with others in your class. Compare your reaction time with others reaction time.
10. ASESSMENT Answer the following Question in a short essay, example and give detailed examples: Were any of the changes so quick you had a hard time measuring them? Were any of the changes so slow that you had a hard time seeing them? What are some different ways that you had to measure the reactions?
