(4 points) q = m × c × Δt Given: q=? m = 34.720g c = 4.18 j/(g x °C) Δt = 41.6°C - 25.2°C = 16.4°C q = (34.720g) (4.18 j/(g x °C) (16.4°C) q = 2380.13j You are trying to figure out the energy change of the water which is the surroundings in the lab. To do that you must take the mass of the metal, which for me was Aluminum, and multiply it by the heat capacity of the water, which was given, then multiply that by the change in temperature, which is the final temperature of the mixture
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.
From the solids mixture, the iron filling were separated by using the property of iron fillings that they were attracted towards the magnet. The solids mixture was spread over surface of white paper then the magnet (covered with another paper) was moved very closely over the solid mixture. The iron fillings were attached to the magnet and were separated and collected in the weighing dish. I did the same procedure three times to separate any remaining iron fillings. Once the procedure was performed three times, the collected iron fillings mass was obtained by using the digital weighing scale.
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
Lab # 4 : The Redox Arena II Procedural Summary There will be three different sized test tubes that will be used in this experiment, a boiling tube, a large and small test tube. The boiling tube will be labeled “R” for “reactants”. A scale with a weighing paper will be tared before adding 2 grams of granular zinc (Zn), record the mass, and then move the zinc to the boiling (R) tube. Weigh out 2 grams of iodine crystals, record it, and this will be added to the R tube, with the zinc. The R tube will then be put in a large beaker.
Procedure 1. Begin to prepare an EDTA solution. Weigh out 3.62-3.64 g of NaH2EDTA and record exact mass. Add the weighed amount to a 250 ml volumetric funnel carefully using a funnel Wash the funnel with water to ensure all of the solid is delivered to the flask Add 100-200 ml of water and mix. Enough water should be added so that the flask is full to the 250 ml mark Tightly wrap the top of the flask with a Parafilm when finished 2.
Eliminate Risk | Automate the process to remove manual handling | 2. Substitute | Have items at waste level, or on lower shelves | 3. Engineer | Provide a platform that raises and lowers the goods and workers | 4. Administrative | Rotate workers or have 2 people working at the same time, job rotation | 5. Use PPE | Provide safety harness, back brace, steel capped boots | D: Storing turpentine and other flammable solvents in a shed 1.
2. Clean the magnesium ribbon with sandpaper. 3. Coil the ribbon and place it in the crucible. Weigh the crucible with its lid and the content in it.
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. Set timer for 5 minutes and record your observations, including the height of the foam produced in a results table 5 Repeat the process for the
There are several safety tips to protect one’s mucous membranes and broken skin. Identify one of the recommended tips. (1 pt) Wear PPE. 5. When working in a microbiology lab, it is important to contain spills and discard materials properly.