The DNA strands are held together by hydrogen bonds. When you use heat to break the nuclear membrane, the heat can also break the hydrogen bonds. So you add the cold ethanol to keep the DNA strands together, and also DNA is non-soluble in ethanol, so it will precipitate out. (See "Extracting DNA from Strawberries Honors", provided by Ms.Morse, 2/21/12.) 2.
However, the alcohol remains fairly constant in the form of glycerol or in other words propane -1,2,3- triol. This form of alcohol contains a hydroxyl allowing longer chains to form of carbon. 7. A common commercial use for esters is in the perfume industry where a synthetic scent is created within labs through the process of esterfication. For example, Benzyl Acetate is one form of an ester that can be used as to create a perfume
Aim To compare the reactivity of various metals by observing their reaction with hydrochloric acid Hypothesis That the all the metals will produce foam and a pop. Variables Independent – Magnesium, Aluminium, Zinc, Copper Dependent – Detergent, Hydrochloric Acid Controlled – Size of the metals, amount of detergent and hydrochloric acid Materials 2 M hydrochloric acid Detergent 10 x test tubes and test tube rack and 5 rubber stoppers 0.5 cm pieces of magnesium, aluminium, zinc and copper 2 cm pieces of magnesium, aluminium, zinc and copper Steel wool Ruler Timer Bench mat Matches and birthday candle Marking pen Safety Remember to wear safety glasses and protective gloves when you do this experiment. 2 M HCl is corrosive. Wash with plenty of water should you get any on your skin or in your eyes. Method Part 1 1 Clean the surface of the 0.5cm piece of magnesium with a piece of steel wool 2 Place the magnesium into a test tube 3 Add three drops of detergent to the test tube 4 Add 2 cm of hydrochloric acid to the test tube.
h) A way to make hard water softer is to put an sodium nitrate and create a precipitate to mellow out the reaction. Another way of making it softer is by removing the calcium ions one way of doing that is by boiling the solution to take out some of the ions. Conclusion: Overall, we determined that sodium carbonate, Na2CO3, is the anion that can be used to precipitate the most metal cations. Also, we learned that the anion sodium chloride, NaCl, could be used to remove silver ions from solutions. The stuff that I found interesting was that how many colours you can get when you mix the cations and anions
StudyBlue Flashcard Printing of Lab Final 2211L UGA http://www.studyblue.com/servlet/printFlashcardDeck?deckId=... In the distillation experiment, the purpose of a fractionating column was to Which liquid would be most easily separated from water by simple distillation? 1. 1-propanol (bp=97 degrees C) 2. 2-propanol (bp=82 degrees C) 3. tetrahydofuran (bp=65 degrees C) 4.
This technique prevents the product to contact other reactants, and leave the heating environment which might cause side reactions. The removal of the product also helps to shift the equilibrium position of the incomplete reaction to the right hand side, and prevents backwards reaction, resulting in an increased yield of products. This experiment also introduces the idea of azeotrope. An azeotrope is a mixture of two or more pure compounds in such a ratio that its composition cannot be changed by simple distillation. This is because when an azeotrope is boiled, the resulting vapour has the same ratio of constituents as the original mixture of liquids.
For example, the reaction |BaCl2•2H2O ( BaCl2 + 2H2O |(2) | is reversible, and if water is added to the anhydrous salt BaCl2, formation of BaCl2•2H2O takes place: |BaCl2 + 2H2O ( BaCl2•2H2O |(3) | The reaction of dehydration of hydrated ferrous sulfate |FeSO4•7H2O ( FeSO4 + 7H2O |(4)
Powder Lab Paper The object of this experiment was to find the changes of each powder. The names were given but the powders were labeled A,B,C,D when inspected visually. Powder A looked like it clumped up together and really thin and tightly packed. Powder B looked soft and lightly packed. Powder C, it was white and a little bit of puffy powder essence to it and it well with small chunks.
Andre’ Dorsey Mrs. B Lab section: Alka-seltzer Experiment In this experiment we wanted to see what would dissolve the Alka-Seltzer the quickest using these three beverages: orange juice, milk, and water. Alka-Seltzer is a pain reliever for minor aches, pains, fever, headache, heartburn, indigestion, and hangovers. What I think about the experiment is that the orange juice would dissolve the Alka-Seltzer the fastest out of the three beverages because it is a acid. The materials used for this is experiment were: beaker a constant, Alka-Seltzer a dependent variable, stop watch a constant, 100ml of water a dependent variable and also a controlled group, orange juice independent variable, and milk independent variable. Procedures for
The substance dissolves in water but not in alcohol, is transparent when dissolved in water, is electrically conductive when dissolved in water, dries white, and has a high melting point. Out of the four compounds we received to test, according to the data we collected, sodium carbonate was the one that would work the best as a fixative for the glaze. In the experiment we conducted you will notice that the independent variables were the different compounds, while the dependent variables were the results to the criteria that had to be met. Also, during our research, we found that sodium chloride and sodium carbonate worked better than sucrose and salicylic acid because they have ionic bonds. These conditions are more suitable for ionic bonds.