Bubble Wand Lab

1. Record your hypothesis about what will happen when Biuret solution is mixed with the solutions from test tubes 1, 2, 3, and 4 here. Be sure to use scientific reasoning to support your hypothesis.

There are several sources of error to this experiment due to random and systematic errors. The only source of random error was the measurement that we took through the graduated cylinder which was only accurate to the nearest 1%. We took the largest error from this one percent, which was +/- 3. The largest relative error this yielded was only 3%, so this did not affect how precise this experiment was too much. We can still make this more precise by making the masses of the water larger. For example if we started the masses at 300mL and went up by 50mL, the largest error this would yield would be 2% due to the largest error being +/- 5. This would cause smaller errors in the amount of water.

For my experiment I picked 3 different brands of bubble gums. Hubba Bubba gum, Bubble Yum and Bazooka. After chewing each piece of gum for 2 minutes, one at the time, I blow a bubble as big as I could. Then, my partner (my mom) measured and I write down the results. I repeated the same steps 3 times and results was collected in a data chart (see data chart # 1). Then, the average size of the bubble was calculated by adding each result and divided by 3. The average size of the bubble made from Hubba Bubba Gum was 3.8 cm, Bubble Yum was 3.5 cm and Bazooka was 3.3 cm. As a result of my experiment, I found that Hubba Bubba gum makes the biggest bubble (3.8 cm).

In this experiment the scientists are looking for how gas production is effected when different sized Alka-Seltzer tablets are put into water. The independent variable is the different sizes while the dependent variable is the amount of gas produced. A constant variable includes the same brand of Alka-Seltzer tablets, the volume of water and same starting temperature. Finally the scientist’s control variable is the first trial testing the whole tablet comparing its reaction time to each new piece.

Then we inverted the tubes so an air bubble would form in the little tube that is now upside-down. Now that we know what to do, we marked the little tube 2/3 full. One tube was filled to that line with glucose solution, another with fructose solution, sucrose solution and the last one with water. Next, the little tubes were topped off with a yeast solution. Then we slide a big tube over the little one and completed the inversion, this is done for every little test tube. After they are all inverted our group measured the bubble present at the top of the little tube. Then we put all of the inverted test tubes into a hot water bath for 20 minutes. After 20 minutes we took the tubes out and measure the air bubbles in the tubes. Next, we recorded the data calculated the net change from the beginning of the experiment to after the hot

We tested three different brands of bubble gum. The three brands are Bubble Yum, Bazooka, and Bubblicious. There were 3 people that blew bubbles for our experiment. My Mom, Dad, and myself were the three bubble blowers. We each read a couple of articles on the best way to blow big bubbles. We then chewed each piece of gum for three minutes before blowing the bubble. We used a ruler to measure the diameter of the bubble in centimeters. Through my research, I believe that the bubble gum with the highest sugar content will blow the biggest bubble.

Which of the following conclusions is most valid, given the results of experiment 1? 6-8.2

The next step in this lab is to rinse the Erlenmeyer flask with distilled water down the drain and then repeat the experiment, this time adding 10 ml of 0.10M KI and 10 ml of distilled water to the flask instead. The flask should again be swirling to allow the solution to succumb to the same temperature as the water bath and once it has reached the same temperature, 10 ml of 3% H2O2 must then be added and a stopper must be immediately placed on the flask and recording should then begin for experiment two. After recording the times, the Erlenmeyer flask must then be rinsed again with distilled water down the drain. After rinsing the flask, the last part of the lab can now be performed. Experiment three is performed the same way, but instead, 20 ml of 0.10 ml M KI and 5 ml of distilled water will be added and after the swirling of the flask, 5 ml of 3% H2O2 will be added. After the times have been recorded, data collection should now be complete.

In this gummy bear lab, the goal was to see the movement of water in cells depending on the concentration of solutes in the environment. The control group was the type of water used. The research question for this experiment was, how does concentration of solute in the environment affect water movement in cells? The hypothesis thought of for this question was that the salt water would enlarge the gummy bear the most. The distilled water would not enlarge the gummy bear as much as the salt water.

variable one is testing for. In this experiment the importance of the control was to compare the

The temperature of the water that the test tubes sit in is another controlled variable. This is because temperature is known to affect rate of fermentation. This can be controlled by using the same water bath to heat all 6 test tubes.

There weren’t many weaknesses identified in the experiment design but there were a few disadvantages of doing this experiment, the main one being that whlist the paper towel was removed from the beaker using our fingers. This may of slightly affected the results as some of the water may of fell back into the beaker or were stuck to our fingers. To avoid this, tongs should be used instead. An unforeseen problem that arouse during the experiment was that we could not measure anything beneath 100ml with the 500ml beaker so we had to improvise and use a measuring cynliner which solved the problem but also affected the results as some of the water could’ve remained

because they were young. Also, if ages would have been given, the experiment could have been

If there is an incident where toxic chemicals spilled on a scientist, he/she must immediately seek for the safety and eye wash station and wash for atleast 15-20 minutes. However, the safety shower’s access in the room was blocked by the gas cylinder hand truck. The eye wash station’s access was crowded by the lab equipments, such as printers, microscopes, made it harder to use if there was a splashing accidence. With these compromises, chemical injuries could be worsening. To prevent this, the hand truck must be stored in designated area away from shower station.

Constant Variable and Control Group:The control group was the respiration rate of the goldfish and lukewarm/normal water.Two controls were the size of the beaker,and the type of fish.