Bath Bomb Surface Area

The purpose of this experiment was to determine if cats have a color preference. I wanted to do this experiment because I took an interest in my cat’s vision. My hypothesis was that my cat would prefer the color blue. I used 5 different colored balls of yarn. They were placed in the same spots and sequence each time. I conducted this experiment for a total of four-weeks. I set my cat up behind a line of painter’s tape and let her approach a yarn ball and play with it. I recorded how many times she approached each color. At the end of the experiment I discovered that my hypothesis was not supported. My cat chose to play with the yarn colored black rather than

However, this is inconsistent with what we have been taught and with what is written in the textbook. Since the textbook is a more reliable source of information, I must conclude that the reason for this difference in results may be attributed to error on the part of the students conducting the experiment.

A few sources of potential error are as follows: loss of product on glassware throughout the experiment, inadequate measuring of chemicals, "impure" chemicals being worked with, and loss of final product during crystallization processes.

11) The gas accumulation in the balloon was measured and recorded at one minute intervals for a total of 10 minutes (qualitative observations were included)

Controls- The control in this experiment was very important because if it was not contained, then the data would have been faulty. It was very difficult to keep

___The helium in the tank must be more dense than the helium in the balloons. ______________________________________________________________________

that were not correct and correct them, giving the data from your experiment that supports the corrections.

As a group we encountered several possible errors throughout the experiment. Blunder error is a common error than can occur.

The pill bugs lab was done to solve the problem of which type of food the pill bugs preferred, cucumber of pepperoni. My hypothesis was that the pill bugs will favor cucumber over pepperoni. In order to carry out this experiment, we used the chamber method to determine which food was favored by the pill bugs. Pieces of cucumber and pepperoni were placed on each end. Then five pill bugs were placed in each chamber, and their movement was observed and recorded. Because the results were so close to each other, we concluded that their reaction to the stimulus was a kinesis reaction, and it is only random. My hypothesis was not true because the standard error from the number of pill bugs in cucumber chamber and pepperoni chamber overlapped. This means that there is no scientific reason for why the pill bugs chose cucumber over pepperoni. I learned many new things in this experiment, such as, how to use a choice chamber, and how to calculate the standard deviation and error of the data. Also, I learned how pill bugs react to an outside threat.

The initial circumference of the balloons were 41.5cm. The temperature of the hot water was 58℃, the room temperature water was 25℃ and the cold water was -4℃. After the balloons were placed in the water for 3 minutes, we got our results. The final circumference of the balloon in the hot water was 40.5. It shrank 1cm less which is a surprise since it should expand.

The problem with the experiment is regression to the mean. Regression is a threat that occurs when you have a nonrandom sample from a population and measures that are imperfectly correlated.

The lab we did required multiple similar steps, with small variations between them. To begin, we weighed out separate amounts of baking soda (NaHCO3) for separate test tubes. We had 6 test tubes labeled 1 through 6. Each test tube held 0.180g, 0.350g, 0.520g, 0.700g, 1.000g, and 1.700 g of baking soda respectfully. We also used six balloons to each hold a certain amount of vinegar (CH3COOH). Each balloon held 10 ml of vinegar. We used the balloons as a way to get the vinegar into the test tubes by fixing the balloon over the mouth of the test tube, being careful not to let the two materials inside mix. This was the beginning of our lab.Our hypothesis was that balloon number 5 would be the largest balloon due to the nearly even ratio of baking soda to vinegar, we were proven wrong through the experiment. Balloons 1 through 3 had an excess of vinegar, which means that all baking soda was dissolved. Balloons 4,5 and 6 had excess baking soda, which means that the vinegar was unable to dissolve all the baking soda. Balloon 6 was the largest balloon.

One possible error is that in order to measure the gas caused by the reaction of the enzymes, it had to run through a tube into the test tube to be measured. This could be a possible error since more gas that what's actually measured in the test tube could be produced since there would still be some of the remaining gas within the tube. So with trials such as 4 and 5, when the data didn't start immediately or at all, it could have been the case that there was gas produced, but not enough that it was shown in the test tube at that time. For all the trials as well, there could have been more gas than what was actually measured when you account for what is left in the tube,as well as in the glass flask. Another possible error is with the rubber stopper.

Bath bombs are a compact mixture of ingredients that dissolve when wet. They fizz up and are used to add oils, fragrance and color to a bath. Bath bombs are a type of bath fizzies, which are products designed to dissolve in a bath. They come in the form of a mixture, packaged in a box, jar, or powder ("The Salt Works® Bath Salt Guide”). This experiment consists of the creation of bath bombs. To create bath bombs, citric acid and Epsom salt are needed. Citric acid is a sour acid in lemon juice and other sour fruits. It is made by the fermentation of sugar or the extraction of citric fruits. Citrus fruits are fruits made of citrus. Citrus is a form of acid. Usually, it is used as flavoring and a setting agent. Citric acid consists of strong preservation

Overall we had very minor problems that did not affect the experiment at all. We used a voltage of (8V) this may off effected the results as, if we used a higher or lower voltage that may have changed the results. If the voltage was higher, the brighter the light would have been. This might make the results more accurate. The metre ruler that was used was not taped to the table which may alter the results.