Literature review: I have chosen two online paper towel experiments. The first one is called The Paper Towel Experiment (Mr. Salsich, 2011). In this experiment their hypothesis was to see if the more expensive paper towels absorb more than the cheaper brands by folding them and inserting into water and using a stop watch. Their results were that all the paper towels absorb averagely. In the second experiment called Soggy Paper (Martyn Shuttleworth, 2008) they used four different paper towels to see which one soaked up the water more.
Data * Below is the table that you will complete for the virtual lab. Either type your results into this table or print the table from the virtual lab (it must be submitted to receive full credit for this assignment. Part I: Density of Unknown Liquid | | Trial 1 | Trial 2 | Trial 3 | Mass of Empty 10 mL graduated cylinder (grams) | 25.31g | 25.40g | 26.03g | Volume of liquid (milliliters) | 8.12mL | 8.26mL | 8.52mL | Mass of graduated cylinder and liquid (grams) | 35.46g | 36.01g | 36.41g | Part II: Density of Irregular-Shaped Solid | Mass of solid (grams) | 42.313g | 40.65g | 40.95g | Volume of water (milliliters) | 48.95mL | 50.03mL | 50.05mL | Volume of water and solid (milliliters) | 53.91mL | 55.04mL | 550.04mL | Part III: Density of Regular-Shaped Solid | Mass of solid (grams) | 25.95g | 27.62g | 25.67g | Length of solid (centimeters) | 5.250cm | 5.0cm | 4.50cm | Width of solid (centimeters) | 3.0cm | 4.0cm | 3.50cm | Height of solid (centimeters) | 2.50cm | 3.0cm | 2.0cm | Calculations Show all of your work for each of the following calculations and be careful to follow significant figure rules in each calculation. Part I: Density of Unknown Liquid 1. Calculate the mass of the liquid for each trial.
Extraction of Spinach Lab Ruben Villalobos TA: Luis Oquendo Date work performed: February 6, 2013 Date work submitted: February 13, 2013 Abstract: The results found where only two of the components found in spinach were separated, they were chlorophyll and carotene. They were separated using a column filled with alumina this allows the separation of the different components of the spinach by polarity. Therefore the chlorophyll was more polar than the carotene. Chlorophyll’s Rf value was 0.32 and the carotene’s was 0.96. This was confirmed by the lab manual in page 30 which contains the list of the different Rf values by decreasing value.
It was concluded that Excedrin tablets consist of acetaminophen, aspirin, and caffeine. Both of these techniques are both effective when needed to find the area and concentration. After using three different calibration curves and the line formula; final areas were found for each ingredient. Acetaminophen had a concentration of 0.02 mg/mL caffeine 0.06 mg/mL and aspirin 0.21 mg/mL. It is concluded that these are the three ingredients in a tablet of Excedrin.
III. Analysis of Data: I found out that in the first trial when I placed the different types of woods in the fire, poplar was the fastest. Second was oak then the pinewood came in last. Next, I found out that when I placed the poplar it was still first to finish burning, second was oak, last was the pinewood. Finally, I found out that in the third trial the three woods; poplar, oak, and pine still stayed in the same burning order.
After 2 days on the leaf where vaseline was applied on both sides there had been barely any water loss (according to all 3 tables) but there had been quite a great loss in water at the leaf where the bottom was covered which was different to my predictions (2 out of 3 tables show this and Ranjita’s table supports my hypothesis because their leaf with V on bottom only lost 26%) but this may just be these particular leaves that do not have that many stomata. To conclude from my results there are more stomata at the bottom but there is quite a significant number at the top too. However the Singapore Science Center states that “more stomata are usually found on bottom of leaves” which would mean that if my results had been a bit more accurate then the bottom side covered with vaseline would have prevented most of the water escaping which means the weight change should not have been great. We can now see that the results could easily be wrong or just a special case. If the leaves were to be kept longer for observation then the leaf with vaseline at the bottom would have died shortly too.
We had the same amount of DPIP except for the blank and different amount of phosphate buffer. We have the same amount of succinate except for tube 4 and no inhibitor except for tubes 3 and 4. After we finished putting all the solution, we then start using the spectrometer. We first caliberated with the blank, then every 2 minutes we keep we add all the samples in the spectrometer until 16 minutes have passed. Are results: we conclude that the Tube 4 had the highest rate of reaction because the absorbance was the lowest .
The average density: =0.82+ 0.77+ 0.77 = 2.36 = 2.36/3= 0.79 g/ml Note that the burette was the most accurate in determining accuracy of measured amounts. The average density for all three of these methods is: = 0.76+ 0.73+ 0.79 = 2.28 =2.28/3= 0.76 g/ml Graph Procedure B. Determination of the boiling point of an unknown liquid Note that the atmospheric pressure in the lab room is 100 Kpa. (Xidos, 2013-2014) Required: An assembled boiling point apparatus. Fifteen drops of the unknown liquid was then placed into an empty
The bottle uses sixty percent less PET plastic and is among the most environmentally responsible packaging out there. Eco-Shape(TM) is credited with reducing Nestle Waters' carbon emission equivalents by more than 356,000 tons since 2007 – the equivalent to removing 78,000 cars from the road. Eco-Shape(TM) also features a label that is 35 percent smaller on average than the previous label, saving nearly 10 million pounds of paper annually.12 An even newer solution emerging in the bottled water market is bio-plastic bottles made 100 percent from plants. The most popular, made from Green Planet Bottling and Keystone Water Company. The bottles are toxin-free and carbon neutral, compared to popular plastic bottles containing petroleum.
"Roughly 85-90% of all recorded episodes of drug use reported by the sample involved marijuana alone and only slightly more than 1 instance in 10 of illegal drug use involved the combined use of any and all drugs apart from marijuana." Grades were almost identical for the total abstainers and those who had used marihuana once or more: 32% of the users and 33% of the abstainers had a B GPA or better. "The highest grades were earned by the casual and infrequent marijuana smoker, and the lowest by the heaviest user; the abstainer earned only slightly higher grades than the heavy user. This data suggest that the amotivational syndrome is far from inevitable or even typical in illegal college drug use and that it may be associated only with heavy drug use. But the data do not show whether the relationship between grades (as a measure of achievement) and drug use is a biochemical, a psychological, or a sociocultural phenomenon, or whether drug users in college are a preselected group as regards academic potential; some minimal degree of drug use could conceivably lower their grades to the level of their less talented abstaining peers.