Exercise 2 began with measuring the milliliters needed to fill a coffee mug and measuring the liters in a gallon. Then we went to the sink and filled a graduated cylinder with 70 ml of water and then placed a pencil in the water. Our lab partner, Temi had to use both of her hands to push the pencil in the water in order to completely submerge it, because it kept floating upward. After completing these steps, we then calculated and recorded the volume. Once we finished this, we then repeated steps (a-d) to measure and record the rock 's volume.
This mixture was poured into the burette with the stopcock closed. The resin that had stuck to the sides of the burette was washed down by pipetting extra pH 3 citrate buffer along the sides. The column was tapped to ensure that the settled resin formed a level surface. After all of the resin settled, the buffer was drained into a waster beaker until the level of the buffer reached the top surface of the resin. For the remainder of the experiment, the top surface of the resin was not allowed to dry
Experiment 1 In this experiment we added different Alkali metals to water and noted the observations with Universal Indicator. PROCEDURE 1. First we took some amount of water in a beaker and added 2-3 drops of Universal Indicator 2. Then we cut the Sodium metal into small pieces 3. Then we added the cut pieces to water in the beaker and noted the change observed.
Then she turned on her hair dryer, and held Chippie in front of the blast of hot air to dry him off. The reporter who got the interview concluded by asking, “How is Chippie doing now?” And the woman said, “Well, Chippie doesn’t sing much any more. He just sort of sits and stares.” Maybe,
It it is kept for more time it will produce more bubbles. Temperature of water : Normal water will be used every time to control the temperature of water. If two different temperature of water will be used, we will not be able to get the exact result and cant relay on the result. Quantity of water: To control this variable water was properly measured by measuring jar and then kept for the
Hydrogen gas was generated during the reaction which was seen when bubbles were formed as the penny was dissolved into the beaker. An error that could have been present during the lab includes not letting the zinc react completely with the chloride ions by removing the penny too early from the solution. For instance, the percent error of this lab was 45.6%, which was determined by the subtraction of the theoretical percent of Cu 2.5% and the experimental percent of Cu 3.64% and dividing by the theoretical percent of Cu 2.5%. This experiment showed how reactants react with one another in a solution to drive a chemical reaction and the products that result from the
One error that could have affected the percent yield is not filtering out all of the liquid from the filter paper in the funnel before setting it off to dry. This would have increased the final mass of the solid, not making it accurate. To stop this from happening again, the liquid could be drained more thoroughly until it fully stops dripping into the Erlenmeyer flask. Another error that could have affected the percent yield is the amount of trials performed. This would have made the results less accurate and made any errors change the final results even more.
Qualitative Data for the boiling of distilled water Time (sec) Qualitative Data 0 - 240 The water is basically motionless 240 The water begins to boil, but there are few bubbles that are small and originate in a “circle” at the bottom of the beaker 270 The bubbles increased in size and frequency 270 - 600 The bubbles remained at the same frequency and size, but the water level decreased slightly due to evaporation Table 5. Qualitative Data for the boiling of isopropyl alcohol Time (sec) Qualitative Data 0 Many tiny bubbles as soon as we put the beaker on the hot plate. Bubbles came from the bottom. Sounded “fizzy”, like a soft drink. 75 Bubbles increased and the liquid is boiling vigorously.
Regardless the constraint he feels inside the store, A&P, Sammy simply expresses his wanting to have Queenie, who symbolises freedom due the actions she does that he considers rebellious to the principles and the ordinary. The story unfolds with Sammy noticing the three girls enter A&P “in nothing but bathing suits” and shows an immediate and strong attention to them enough to make him forget whether he rang the HiHo crackers. He begins to describe the girls and states that first girl’s “belly was still pretty pale” and that the second had “black hair that hadn't quite frizzed right”. After a short explanation of the previous girls, Sammy portrays an endless detail of the last one, whom he calls Queenie of how she “walked straight on slowly”
A dehydrated brain works harder to accomplish the same amount as a normal brain and it even temporarily shrinks because of its lack of water. Over-hydration, or hyponatremia, is usually caused by over consumption of water in short amount of time. Athletes are often the victims of over-hydration because of complications in regulating water levels in extreme physical conditions. Whereas the dehydrated brain amps up the production of antidiuretic hormone, the over-hydrated brain slows, or even stops, releasing it into the blood. Sodium electrolytes in the body become diluted, causing cells to swell.