Which reactions, if any, do you believe showed no evidence of chemical change? Justify your reasoning. (15 points) I believe the baking soda (NaHCO3) and the clear ammonia (NH3) had no reaction because both substances are basic. As in
The second substance is water. The water is clear and thin liquid. The hypothesis is that cornstarch and water mixed together is a liquid when there is no pressure being applied to it, but it is a solid when pressure is on it. The objective of the lab Investigating Mixtures, is to observe that not all liquid behave the same way when mixed with other liquid. This mean that the vegetable oil particles heterogeneous.
Since there had been no previous documentation of the potato seeds being poisonous, it was assumed that McCandless had been consuming the poisonous seeds of H. mackenzii, the sweet pea (Krakauer, 192). This, however, was entirely untrue. Chris had in fact ingested the seeds of Hedysarum alpinum and the seeds themselves were not his killer. Upon further research it was determined that a mold, R. leguminicola, growing on the potato seeds was the cause of Chris McCandless’ eradication, not his ill preparedness (Krakauer, 194). The mold prevented Chris’ body from processing food into
Therefore, acid fat, lactose fermentation, mannitol fermentation were not needed to be performed, because they are selective to a specific thing. As a result, Unknown bacteria “W” was concluded to be gram stain positive, endospore positive, bacilli shape (rod shape), and arranged in chains (strepto-). Test Purpose Reagents Observation Results Gram Stain To determine gram reaction of bacteria. Crystal violet, Grams iodine, Alcohol, and Safranin Purple streptobacilli bacteria was observed. Gram positive rods.
As you can see from my sample that our aspirin sample contains a small amount of pure aspirin and a lot of salicylic acid. Therefore this means that my sample wasn’t pure as it still had remnants of salicylic acid which suggests to me that the reaction hadn’t been fully completed, however my sample did contain a small amount of pure aspirin which means that the reaction is partially had taken place. The sample would have been pure if there was no salicylic acid on the card then my sample would match the pure aspirin sample which means there would have been a fully completed reaction. 2. State what practical techniques used during the procedure and explain how they influence the purity of the sample.
Someone mixed hydrogen peroxide, baking soda, and Mountain Dew, and the human being said that it glowed in the dark which makes Mountain Dew glow in the dark. After the human being posted the video another human being proven that it was just a joke because Mountain Dew can’t glow in the dark. The prankster slipped in liquid from a glow stick in the Mountain Dew, baking soda, and the hydrogen peroxide was not in yet. After, the hydrogen peroxide and the glow sticks liquid mixed up the solution began to glow. The Mountain Dew had nothing to do with the substance glowing (Dangers of Opening Glow Sticks).
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. Once iodine was dropped onto the circle, which was labeled “HCL+ saliva”, was divided into two colours, white and navy blue, this arose because the starch did not get broken down. The enzyme got denatured with the extension of hydrochloric acid of hydrochloric acid. The acid found in hydrochloric acid obtains a low level oh pH (2), causing it not to be broken down, rather to be denatured, confirms amylase can’t continue it’s activity without a particular high amount of acid, (that is found in stomach acid). My hypothesis is incorrect due to the fact that my prediction is
aureus bacteria did not develop resistance to lugdunin, even though with the exposure in people and in repeated exposure in the laboratory. In mice, S. aureus causes lugdunin applied topically was able to either partially or totally eradicate skin infections. This antibiotic cannot be used to clear S. aureus colonies in people recently. The researchers trust that the drug might be able to be taken systemically as it did not exhibit any signs of toxicity on a sample of human serum. Furthermore, lugdunin is not very soluble in water because it might be difficult for body to absorb it.
(2-tailed) .065 N 10 10 a. Treatment type = Calcium When running a Pearson Correlation Test, the results for the two tailed test reveal that there is no correlation between the Start measure and End measure for those given Calcium, as there is no significance indicator at the end of the table. B - Correlation check between the Start measure and End measure for those given placebo. Again, using a simple scatterplot diagram first, to check if there is a visual linear correlation between the starting and ending values for the Placebo, it would appear that there is an amount of correlation. As there is some visual evidence of this, the author proceeded to test the strength of the correlation, by utilising the Pearson Correlation Test.
Also, salt is an ionic compound and not a polar covalent compound, even though it did not melt last, due to the fact that the elements Na and Cl, both lose or gain an electron and then bond because of their opposite charges, which is a property only ionic bonds possess. The wax was the only substance whose results were synonymous with my hypothesis, since it required a low temperature for its melting point and was not soluble in water, both properties of nonpolar covalent compounds. Potential sources of error included not labeling the spots each substance was placed in the aluminum foil boat, seeing as the result for sugar seemed to be the correct conclusion for salt and vice versa. A future experiment would involve individually testing each substance in an aluminum foil boat, of the same brand, on a heat plate in order to avoid uncertainty. Each substance should be timed to record the precise time each substance began to melt or burn.