Get Hydrochloric acid and use the measuring cylinder to measure 40 ML of it. Then pour into beaker for easier usage. 3. Get a Bunsen
Add 1 mL of deionized water to the small test tube containing the precipitate and mix it and centrifuge it for 60 seconds. Then, add the supernatant into the boiling test tube and repeat this step one more time with another 1 mL of deionized water. Acquire a pair of metal test tube holders and heat the boiling test tube to evaporate the water for 15 minutes. Let is cool after and weigh it. Then, calculate a percent yield of zinc iodide and write a balanced chemical equation and determine the limiting
Pour all the filtrate and washings into a 250cm3 volumetric flask. Make up to 250cm3 with 1.0mol dm-3 sulphuric acid(VI) acid. Stopper the flask and invert several times to thoroughly mix the solution. 5. Fill the burette with 0.005mol dm-3 potassium manganate(VII) solution.
Cylinder was rinsed with distilled water. * * 2. 2.0 ppm standard: 2.00 mL of 10.0 ppm phosphate solution was placed in a 25 mL graduated cylinder and diluted to exactly the 10 mL mark with distilled water then poured into a plastic cup labeled 2. Cylinder was rinsed with distilled water. * 3.
Because no model represents all aspects of the natural world perfectly * Why is it important for a scientist to understand the limitations of the models they use? If they don't, they will have flawed observations * Choose a specific example of a scientific model and describe Globe * its strengthswhat can it be used to study? it shows where land, water, and mountains are, its shows location * its limitationswhat are some things that it cannot accurately represent? it doesn't represent of high or deep mountains, oceans are. It is not very accurate on the sizes of countries * Define and give an example of each of the following types of scientific
Using another 125-mL flask, 60-mL of 0.3622 M potassium hydroxide in ethanol was deposited. Both flasks were clamped in a temperature-controlled bath regulated at 50.0˚C. The solutions were then set in the temperature bath for ten minutes to equilibrate. An empty 250-mL Erlenmeyer flask was also clamped in the same water bath. In another flask 50-mL of ice water was deposited with three-drop phenolphthalein.
Our scale only measures to grams accurately, and could have not accurately represented the .68g of CaCO3, or we could have lost the solid precipitate in the process of the experiment. These errors could be reduced with a more accurate scale, as well as more experienced hands performing the procedure, or skilled hands, ie: we are novices at this lab, and training could produce more accurate
Part A: Spectroscopy 1. 0.05g of Iron(III) Nitrate in a 50-ml beaker. Add 17 mL of distilled water to the beaker and mix with a stir rod until the solid is completely dissolved. 2. Obtain another 50-mL beaker and add 0.05g of Chromium(III) Nitrate to the beaker.
In particular, it discusses what constitutes good empirical science and how you should present your results. The first thing worth stressing is that there are no right or wrong empirical results. Empirical results are what they are and you should not be disappointed if they do not show what you had hoped they would. In an ideal world, a researcher comes up with a new theory then carries out empirical work that supports this new theory in a statistically significant way. The real world very rarely approaches this ideal.
Rigor and control of extraneous variables allow researchers to establish a cause-effect relationships testing casual relationships (Polit and Beck, 2012).Experimental designs strengths are that a researcher gains first hand knowledge based on the use of actual tests and trials. The weaknesses are that outcomes may not be the most desirable and may be cause for a major effect up to the death of a patient. There is also the subject of ethics, how much exposure to experimental research is considered enough or is justified. Nonexperimental design Arnold (1997) comes in many forms and generally refers to research that does not employ randomization and control groups (p.44) .This is a non intrusive way to research. Based on actual fact and findings one can discover the actual results needed.