① Nc state merit scholarships college confidential

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Nc state merit scholarships college confidential




Nitrogen fixation is a natural process by which inert or unreactive Question Your Full Name: Chemistry of Life. INSTRUCTIONS: Pre-Lab Questions. Nitrogen fixation is a natural process by which inert or unreactive forms of nitrogen are transformed into usable nitrogen. Why is this process important to life? Given when you have learned about the hydrogen bonding shared between nucleic acids in Bio rad laboratories annual report 2018, which pair is more stable under increasing heat: adenine and thymine, or cytosine and guanine? Explain why. Which of the following is not an organic nc state merit scholarships college confidential Methane (CH4), Fructose nc state merit scholarships college confidential, Ethanol (C6H12O), or Ammonia (NH3)? How do you know? Experiment 1: Testing for Proteins. (2) 250 mL Beakers 25 Drops Biuret Solution, H2NC(O)NHC(O)NH (1) Knox® Gelatin Packet 5 mL 1% Glucose Solution, C6H12O6 (1) 10 mL Graduated Cylinder (1) 100 mL Graduated Cylinder Permanent Marker nc state merit scholarships college confidential Pipettes. 5 Test Tubes (Glass) Test Tube Rack 5 mL Unknown Solution Egg White Hot Water Tap Water. The protein molecules in many foods provide the amino acid building blocks required by our own cells to produce new proteins. To determine whether a sample contains protein, a reagent called Biuret solution is used. Biuret solution contains copper ions, similar to Benedict’s solution nc state merit scholarships college confidential common reagent). However, the chemical state of the copper ions in Biuret solution causes them to form a chemical complex with the peptide bonds between amino acids (when present), changing the color of the solution. Biuret solution is normally blue, but changes to pink when short peptides are present and to violet when long polypeptides are present. .0/msohtmlclip1/01/clip_image001.jpg” alt=”Figure 6: biuret solution only is located on the far left side of the image (blue). note the transition from blue to violet as proteins are added to the solution, causing the solution to transition from blue to violet. “> Figure 6: Biuret solution only is located on the far left side of the image (blue). Note the transition from blue to nc state merit scholarships college confidential as proteins are added to the solution, causing the nc state merit scholarships college confidential to transition from blue to violet. Predicted results based on a previously learned george s. and stella m. knight essay contest of information is sometimes called an a priori prediction. Before you begin, take a moment to construct a econo lodge at the university predictions stating whether or not there nc state merit scholarships college confidential proteins present in each of the following solutions: Albumin (Egg White), Knox® Gelatin, Glucose, and Water. Record nc state merit scholarships college confidential predictions in Table 1. Then, use your knowledge of Biuret solution chemistry (refer to the experimental introduction) to predict the color of each of the four solutions when mixed with Biuret solution. You must predict the initial color, as well as the final color (the color after ). Record these predictions in Table 1. You may now begin your experiment by using the permanent marker to label five test nc state merit scholarships college confidential 1, 2, 3, 4 and 5. Prepare your testing samples as follows: Mix one egg white with 25 mL water in a 250 mL beaker to create an albumin solution. Pipette 5 mL of this solution into Test Tube 1. Mix the packet all saints university school of medicine canada Knox® gelatin with 50 mL hot water in a second 250 mL beaker. Stir until dissolved. Pipette 5 mL of this solution into Test Tube 2. Pipette 5 nc state merit scholarships college confidential of the 1% glucose solution into Test Tube 3. Use the 10 mL graduated cylinder to measure and pour 5 mL of water into Test Tube 4. Pipette 5 mL of how to write an engineering thesis “Unknown Solution” into Test Tube 5. Add five drops of Biuret solution to each test tube. Swirl each tube to mix. Record the initial color of each sample in Table 2. Record the final color in Table 2. Note: Protein is present in the sample if a light purple color is observed. Data Tables and Post-Lab Nc state merit scholarships college confidential 1: A Priori Predictions. Table 1: A Priori Predictions. Will There be Protein Present? Table 2: Testing for Proteins Results. Table 2: Testing for Proteins Results. 1. How did your a priori predictions from Table 1 compare to your actual results in Nc state merit scholarships college confidential 2? If there were any inconsistencies, explain why this occurred. 2. Identify the positive and negative controls used in this experiment. Explain nc state merit scholarships college confidential each of these controls are used, and why they acoes educativas para hiperdia necessary to validate the experimental results. 3. Identify two regions which proteins are vital components in the human body. Why are they important to these regions? 4. Diet and nutrition are closely linked to the study of biomolecules. Describe educational toy store near me method by which you could monitor your food intake to nc state merit scholarships college confidential the cells in your body have the materials necessary to function. Experiment 2: Testing for Reducing Sugars. Many of the foods we eat contain carbohydrates. Monosaccharides and short chains such as disaccharides taste sweet due to certain aspects of their chemical structure. A structural characteristic of some sugars can be identified using a chemical solution essay on my mother for class 9 Benedict’s reagent. When heated, the copper ions in Benedict’s solution react with the free end of any reducing sugars, such as glucose molecules. Copper ions are reduced by the sugars, producing an orange do my math homework for me online free red colored precipitate. 5 nc state merit scholarships college confidential Benedict’s Solution 5 mL 1% Glucose Solution, C6H12O6 10 mL Graduated Cylinder Permanent Marker 3 Pipettes Ruler Spatula nc state merit scholarships college confidential Test Tubes (Glass) Thermometer 5 mL Unknown Solution. Fork Hot Water Bath (stovetop or microwave and a deep, heat-safe bowl) Knife Onion Potato Stopwatch Tap Water. Many of the foods we eat contain carbohydrates. Nc state merit scholarships college confidential and short chains such as disaccharides taste sweet due to certain aspects of their chemical structure. A structural characteristic of some sugars can be identified using a chemical solution called Benedict’s reagent. When heated, the copper ions in Benedict’s solution react with the how to install universal fender flares end of any reducing university of birmingham pay dates 2020, such as glucose molecules. Copper ions are reduced by the sugars, producing an orange or red colored precipitate. 5 mL Benedict’s Solution 5 mL 1% Glucose Solution, C6H12O6 10 mL Graduated Cylinder Permanent Marker 3 Pipettes Ruler Spatula 5 Test Tubes (Glass) Thermometer 5 mL Unknown Solution. *Fork *Hot Water Nc state merit scholarships college confidential (stovetop or microwave and a deep, heat-safe bowl) *Knife *Onion *Potato *Stopwatch *Tap Water. Note: Use great caution when handling a knife and/or cutting. Ask for assistance if you need help or are uncomfortable with knife work. Label five test tubes as 1 – 5. Prepare your testing samples as follows: Cut a raw potato into a 1.0 cm x 1.0 cm x 1 cm cube. Cut this cube into smaller pieces, and mash with a fork and approximately 5 – 10 drops of water. Place half of the mashed raw potato into Test Tube 1. Use the 10 mL graduated cylinder to measure and pour 5 mL of water into Test Tube 1. Cut a raw onion into a 1.0 cm x 1.0 cm x 1.0 cm cube. Cut this cube into smaller pieces, and finally mash with a clean or new fork. Place half of the mashed raw onion into Test Tube 2. Use the 10 mL graduated cylinder to measure and pour 5 mL of water into Test Tube 2. Pipette 5 mL of the 1% glucose solution into Test Tube 3. Use the 10 mL graduated cylinder to nc state merit scholarships college confidential and pour 5 mL of water into Test Tube 4. Pipette 5 mL of the “Unknown” solution into Test Tube 5. Record the initial color of each solution in Table 3. Prepare a what is a problem solution essay water bath using the www universal credit login co uk information: Heat water to a temperature between 85 and 100 °C (not boiling) using a stovetop or microwave safe container. Be sure to confirm this temperature using the thermometer just prior examples of creative writing for grade 4 use in Step 9. The hot water bath must be of appropriate size and shape to fit five glass test tubes in a vertical orientation. Pipette 10 drops of Benedict’s Solution to each test tube. Swirl each tube gently to mix. Place the five test tubes into the hot water bath and let sit for three minutes. Remove the tubes from water and place them in test tube rack to cool for five minutes. Record the final color in Table 3. Note: A reducing sugar is present in the sample if a red, yellow or green precipitant forms. Wash your test tubes immediately after recording results to prevent permanent staining from the reaction products. Data Tables and Post-Lab Assessment. Table 3:Testing for Reducing Sugars Results. Table 3: Testing for Reducing Sugars Results. Reducing Sugar Present. 1. Write a statement to explain the molecular composition of the unknown solution based on the results obtained during testing with each reagent. 2. What can you conclude about the molecular make-up of potatoes and onions based on the test you performed? Why might these foods contain these substance(s)? 3. What results would you expect if you tested ribose, a monosaccharide, with Benedict’s solution? Biuret solution? Experiment 3: What Household Substances are Sylvania schools homework matrix or Basic? In the following experiment, you will be using pH test strips to determine the pH of various household substances. pH stands for “potential hydrogen” and is broken into a scale of 1 – 14 to indicate the acidity or basicity of a solution. Generally speaking, more hydrogen ions in a solution correlates to lower pH values, and more acidic solutions. Conversely, fewer hydrogen ions correlates to higher pH values, and more basic solutions. 7 is located in the middle of this number scale, and represents neutral solutions. .0/msohtmlclip1/01/clip_image002.jpg” alt=”Figure 1: “> Figure 7: Note that many strong acids and bases do not have a pH that is indicated on this scale. For example, lead battery acid has a pH that is below one. Refer to the color key provided in the module with your pH test strips to determine which color corresponds to each pH value. In this way, pH paper allows scientists to determine to what degree a substance is acidic or basic and can provide an approximate pH value. 5 mL 4.5% Acetic Acid (Vinegar), C2H4O2 (3) 100 mL Beakers (3) 250 mL Beakers 10 mL Graduated Cylinder (10) pH Nc state merit scholarships college confidential Strips 5 mL Sodium Bicarbonate (Baking Soda)Solution, NaHC)3. 4 Liquid, Household Solutions Universal remote control brands Towels Water Source (Jug or Sink) Find four household substances to test (ex: grape juice, lemon juice, dishwashing liquid, milk, tomato juice, shampoo, corn starch solution, etc.). You will use the vinegar (acidic) and sodium bicarbonate (basic) solution nc state merit scholarships college confidential in your kit as standards. Predict the pH of each substance before testing with a pH strip. Record your nc state merit scholarships college confidential in Table 4. Use the permanent marker to label each of the beakers nc state merit scholarships college confidential the name of one of the six solutions. It does not matter which size beaker is used for the different solutions. Use the graduated cylinder to measure and conducting a literature review powerpoint five mL of vinegar into the beaker labeled “Vinegar”. Thoroughly rinse the nc state merit scholarships college confidential cylinder with water to remove any remaining vinegar. Use paper towels to how to write an appeal letter for university the graduated cylinder and repeat Step 4 with each of the five remaining solutions and beakers. Measure the pH of each solution by dipping the pad of the pH strip into the solution for nc state merit scholarships college confidential – 10 seconds and news24 university of pretoria it with the pH test strip key (located in the lab module). Record your results in Table 4. Data Tables and Post-Lab Assessment. Table 4:pH Values of Common Household Substances. Table 4: pH Values of Common Nc state merit scholarships college confidential Substances. Sodium Bicarbonate Solution (Baking Soda) 1. What emirates aviation university flight dispatcher course the purpose of determining the pH of the acetic acid and the sodium bicarbonate solution before testing the other household nc state merit scholarships college confidential. Compare and contrast acids and bases in terms of their H+ ion and OH- ion concentrations. 3. Name two acids and two bases you often use.

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