2. What happened to the vapor pressure of water as the temperature increased? 3. In your lab, you noticed that the height of the water changed as you increased the water temperature. Barometers work in a similar way; however, liquid mercury is used instead of water.
For example, an experiment similar to this one could be how pressure could affect the time it takes for an Alka-Seltzer tablet to dissolve. Using A flask and rubber stoppers, you can compare the amount of time it takes for and Alka-Seltzer tablet to dissolve in regular room temperature water and room temperature water in a flak but with a rubber stopper stopping the air flow into the flask. This is related to the experiment performed above because the increase in pressure from the rubber stopper stopping the air flow in and out of the flask may affect the time it would take for the Alka-Seltzer tablet to dissolve. Another example of an experiment related to the one performed above is how the amount of water used to dissolve an Alka-Seltzer tablet effects the time it takes for one to dissolve. This also relates to the experiment performed above because it also affects how fast the rate of reaction is.
A slight error in the indicator can shift the endpoint and consequently affects the volume of the obtained NaOH. Lastly, the final source of error of this experiment is misjudging the color of the indicator near the endpoint. The color change is very intricate that even a small amount of the standard solution can produce different shades of the color. With these uncertainties, a 23.3 % error was committed given that the theoretical molar concentration of acetic acid in the the vinegar sample is
Some factors that could have affected the experiments end result could have been through measuring the all the reactants and equipment their might have been an error somewhere there. Another factor that could have been is that the vinegar was a lower concentrated acetic acid and could have other components in it as well which could have ruined the end measurement of the final product by getting a heavier measurement that actually
It measures the flow of heat in the phase transitions. It is used widely in most of the industry include foods, agriculture and etc. If the samples tested undergoes endothermic process which absorb energy, the temperature of the sample pan will decrease, so more amount of heat is required to ensure the temperature to reach equilibrium. This extra amount of heat is same as the amount of heart absorbed in endothermic process (Figura and Teixeira, 2007). (Slideshare.net, 2016) The peak is associated with the onset temperature, which the substances starts to melt.
The pH was found to be 7, which is in the range of a healthy person’s pH (which is 7.4).Benedict`s solution is made up of alkaline copper sulphate and sodium citrate (blue in colour) (Danson and et al, 1996). When it is put in a hot water bath (boiled) when there are reduced sugars, cupric ion is decreased by sugars changing it into an insoluble red cuprous oxide. The solution will change to yellow, orange, green or red, for rising levels of sugar, and will stay blue if no sugar is detected. If the solutions stay the same (blue), the result is negative. In this experiment, the colour remained blue and thus there were no sugars present in the solution.
What was observed with the addition of hydrochloric acids? What did it do to the enzyme? -With the addition of hydrochloric acid I observed that a part of the bead turned white, while the other transformed into a navy blue Colour, with a pH of 2, hydrochloric acid granted amylase to denature, it partially turned white, because it simplified the starch on the paper the alternative obtained a navy blue Colour, because it did not simplify starch deeming it not to execute its function. Analysis: Once iodine was dropped onto the circle, which was labeled “Water”, it transformed into a dark blue Colour, due to the fact that it didn’t consist of any form of starch. Once iodine was dropped onto the circle labeled “ Saliva”, it transformed into a white/ yellow Colour, due to it granting the starch to break down properly, it transformed white as a result of there being no starch, hence it executed its main action.
This results the compound absorbing a different wavelength of light, hence changing the colour . Logically, the expectation is that the higher the concentration of saliva, the more breakdown of starch will occur and a brighter shade of blue will be produced because less starch will be detected by the iodine
4. What temperature should the plates be incubated at and why? [2 MARKS] Both the nutrient and chromogenic plates should be incubated at 37 degrees Celsius because this will mimic the temperature of the birthing pools where the sample is from as well as mimicking the temperature of the human body. 5. You use cUTI plates as the chromogenic media and find that some of the colonies have turned pink in colour.
The keys to observing hot water freezing before cold water are supercooling the water and having a significant difference in the spontaneous freezing temperature of the two water specimens”. We observed in the experiment that the container of hot water is in better thermal contact with the freezer floor than the container of the cold water and heat will now
3.) The normal ph of vaginal secretions is 4.5 (3.8 to 4.5). The vaginas ph plays a vital role in the its health a fertility. The normal ph range for the vagina stays between 3.8 to 4.5, which is slightly acidic. When the ph increase it makes the vagina more neutral causing the bad bacteria to thrive and overgrow.
If I had a chance to do this experiment once again. I would improve this experiment by actually testing, whether temperature affects the rate of reaction of the alka seltzer tablet, by having the water be hot, warm and cold, and determine at which temperate does the tablet dissolve faster. I could also change the amount of water I used during the experiment, as I only used 100ml of water in a 400ml beaker. I would also change the temperate of the room. A further investigation can study how temperature affects the rate of reaction between water and alka seltzer tablets.
My group recorded higher heart rate compare to the class average when we used caffeine on the Daphnia as seen in Figure 2. Several errors could have accounted for this data. This including perhaps the Daphnia’s heart rate may have changed because of fear while being moved from the bowl to the microscope slide. Another possible error could have also been the amount of time that it took to change the solutions, which could have accounted for slight variations in heart rate. Temperature is yet a further error to account for as the microscope slide temperature was constantly changing to view the specimen, and change the dosage of caffeine or alcohol.
The light then breaks into parallel lines. The grating allows us to see the colors in the spectrum. We can measure the light using the spectroscope grid template. Exercise 2: Using the Spectroscope Questions A. Describe the similarities and differences between the spectra of incandescent light and fluorescent light.