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Big Pieces or Small Pieces: Which Reacts Faster?
Transcript of Big Pieces or Small Pieces: Which Reacts Faster?
Fill the glass with water to the level of the masking tape.
Measure the temperature of the water, and record it in your lab notebook. Each trial should be carried out at the same temperature, so adjust the water temperature (by adding warm or cold water) as necessary.
Remove the thermometer. (It's not a good idea to use the thermometer as a stirring rod. It might break.)
Have your helper get ready with the stop watch, while you get ready with an Alka-Seltzer®. Have your helper count one–two–three. On three, the helper starts the stop watch and you drop the tablet (or tablet pieces) into the water.
You'll immediately see bubbles of CO2 streaming out from the tablet.
Stir the water gently and steadily. Use the same stirring method and speed for all of your experimental trials. The tablet will gradually disintegrate. Watch for all of the solid white material from the tablet to disappear.
When the solid material has completely disappeared and the bubbles have stopped forming, say "Stop!" to have your helper stop the stopwatch.
Record the reaction time in your lab notebook.
Tip: be careful when opening the packets and handling the Alka-Seltzer® tablets. The tablets are thin and brittle, so they break easily. You need to have four whole tablets for this experiment.
HALF TABLET AND TABLET CUT IN QAURTERS
OBSERVATIONS IN DETAIL
OBSERVATIONS DURING EXPERIMENT
FOR THE THIRD EXPERIMENT WE BROKE THE ALKA SELTZER TABLET INTO 4 PIECES AND TOOK THE TIME FOR THESE PIECES TO COMPLETELY DISSOLVE IN THE WATER. OUR RESULTS WERE:
TRIAL 1: 43 SECONDS
TRIAL 2: 46 SECONDS
TRIAL 3: 42 SECONDS
OUR FOURTH EXPERIMENT WAS TO TIME THE TIME TAKEN tablets TO COMPLETELY dissolve IN WATER. OUR RESULTS WERE:
TRIAL 1 : 36 SECONDS
TRIAL 2: 39 SECONDS
TRIAL 3: 32 SECONDS
THROUGHOUT OUR OUR EXPERIMENT THE TEMPERATURE OF THE WATER AND THE AMOUNT OF WATER REMAINED CONSTANT. IN THIS EXPERIMENT THE SIZE OF THE TABLET WAS THE independent VARIABLE WHILE THE TIME TAKEN FOR THE TABLET TO dissolve REMAINED THE DEPENEDENT VARIABLE
Alka-Seltzer is known to fizzle when dropped into water. Could the time it takes to fizzle be dependent of the SIZE OF THE TABLET? How big of an impact does IT have on Alka-Seltzer’s reaction? In this experiment, we will find out.
Alka-Seltzer is an effervescent antacid and pain reliever first marketed by the Dr. Miles Medicine Company. It was developed by Maurice Treneer, head chemist at Miles, in Elkhart, Indiana. what make Alka-seltzer dissolve is the baking powder, when the baking powder dissolves the components of it which are citric acid or tartaric acid react with each other and produce carbon dioxide.
MATERIALS AND EQUIPMENT
At least 12 Alka-Seltzer® tablets
Sheet of blank paper
Piece of scrap wood
Thermometer (good range would be -10°C to 110°C
Something to stir with
Stop watch (you can also use a clock or watch with a second hand)
If water is kept at a constant level and temperature then crushed Alka-Seltzer would take less time than any other sizes to dissolve
the measuring cup to add 8 ounces (236 mL) of water to the glass. (If you're using metric volume units, rounding up to 250 mL is fine.)
Use a piece of masking tape on the outside of the glass to mark the water level. Place the tape with its top edge even with the water level in the glass.
Now you can use the masking tape to fill the glass to the right level for each trial.
For observing the reaction, you will use the same volume of water at the same starting temperature. The only variable that you should change is the particle size of the tablets. You will use four different particle sizes for the Alka-Seltzer® tablets:
A whole tablet
A tablet broken in half
A tablet broken in quarters
A tablet ground into powder. To do this, fold a single tablet to be ground inside a clean piece of paper. Place the folded paper on a piece of scrap wood, and use the hammer to firmly pound the tablet about ten times. Stop immediately if the paper shows signs of tearing: you don't want to lose any of the powder.
As soon as tablets are dropped into the water it begins to fizz. From background information we already know it is fizzing because of the ingredients in alka-Seltzer reacting together. When fizz have disappeared we stir with a spoon, then write down reactant time.
Our hypothesis that crushed Alka-Seltzer would dissolve faster than the whole, half and quarter Alka-Seltzer tablet at constant temperature was confirmed. this is due to the increased surface area of particles when crushed. the increASE in surface ares causes the particles to come more in contact with each Other thus dissolving the tablet faster.
"Alka-Seltzer." Student Science Experiments. N.p.. Web. 5 Feb 2014. <http://www.alkaseltzer.com/as/student_experiment1
"how does Alka-Seltzer work?." Feel better fast! . N.p.. Web. 5 Feb 2014. <http://www.bryanfields.com/samples/alka/product/how.html>.
"THE EFFECT OF TEMPERATURE ON REACTION RATES." Chemguide. N.p.. Web. 5 Feb 2014. <http://www.chemguide.co.uk/physical/basicrates/temperature.html>.
in the first experiment we timed the time taken for an entire tablet to dissolve in water. in this experiment we got the following results:
trial 1: 52 seconds
trail 2: 51 seconds
trial 3: 51 seconds
for the second experiment we timed the time taken for the two halves of these tablets to dissolve in water. our results were:
trial 1: 49 seconds
trial 2: 48 seconds
trial 3: 46 seconds
Big Pieces or Small Pieces: Which Reacts Faster?
THIS PROJECT IS DONE BY