Read the scenario below. Identify what is inappropriate lab behavior in each instance. Then write the appropriate lab safety technique. Kendra is heating a test tube for an experiment using a Bunsen burner. She didn't put on safety goggles since she already wears glasses. She tilts the test tube mouth away from her towards her lab partner, since the steam keeps fogging up her glasses.
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- • Stock solution: 1000 mg/L Target sample concentrations: 50-400 mg/L • Create a 5-point standard dilution to cover the test • If each test only needs 10 mL, make plans to make the dilution so you have 20 mL of each concentration. ·Which of the following statements is not correct concerning lab safety rules? Lab instructor must be notified if there is a mercury spill due to a broken mercury thermometer. The wearing of shorts, tank and sandals is permitted in the laboratory. Fire alarms, fire extinguishers, showers, and eye washing device, are examples of safety equipment's in your lab. Clean pipets and droppers cannot be inserted into the original reagent bottle.Which of the following is an example of good lab safety practices? Handling chemicals without wearing your PPE. Taking off your goggles if you're not using chemicals, even if the person next you is working with chemicals. Wearing shorts in lab. Placing a cap on all chemical containers when not in use. Wearing sandals or flip-flops to lab.
- A sample of fried potatoes weighing 200 g was extracted using a volatile organic solvent. The recovered cooking oil weighed 15 g. What methods from this experiment could be used to separate the cooking oil after the extraction? What was the percent oil in the potatoes? Show your calculations. How is gravity filtration different from vacuum filtration? Give examples of mixtures that can be separated by gravity filtration.HDPE and PS are both inert to bases and acids, which plastic would you rather chose to put 1 Liter of 6M HCl for general chemistry lab? Explain why.Concentrated sulphuric acid is used in this experiment to O help the crystal growth of acetylsalicylic acid speed up the reaction of aspirin synthesis increase the activation energy O avoid impurities getting trapped into the aspirin crystals P Type here to search
- I need help with one of my pre-lab questions which I want to understand. Its question number 2, the one that highlighted. I don't want to make it over-complicated, I want something that I can understand.Which PPE should the experimenter wear when performing the experiment in the lab? O Apron Flame-resistant lab coat Nitrile gloves Face shield O GogglesDr. Caras was characterizing a cytochrome (an iron containing protein) from a new strain of bacteria. He obtained eight measurements of the percent iron in the protein: 0.3205%, 0.3202%, 0.3196%, 0.3198%, 0.3316%, 0.3197%, 0.3208%, and 0.3197%. Calculate the mean () and standard deviation (s) for these results. x = Use the Grubbs test to determine if one of these values is an outlier. What is the value of Gealeulated? Gcalculated = Should this potential outlier be rejected with 95% confidence? Critical values of G can be found in this table. The potential outlier should be kept. The potential outlier should be rejected.
- PART 3- LABORATORY EQUIPMENT EQUIPMENT NAME FUNCTION To hold test tubes. Attaches to a retort stand to support glassware being heated. To pour liquid from a large container into a small container. To provide a flame during an experiment. ones To light the Bunsen burner. To attach test tubes to a retort stand. To clean substances out of a test tube. To hold a hot crucible or flask. To hold a hot test tube. To place on the lab bench to prevent burning or to use with ring clamp. To transfer small amounts of liquid. To grow bacteria or contain small experiments. To hold liquids. To measure liquids. To contain experiments (a stopper can be used to close the flask). To hold a hot beaker. To perform an experiment with a different substance in each well. To hold chemicals and perform experiments in. To scoop and transfer small amounts of substances, To stir during experiments that involve mixing or dissolving.Choose the one correct or one incorrect statement regarding filtration: gravity filtration uses a Buchner funnel, filtering flask and negative pressure filter paper should be wet with solvent to seal it to the funnel before filtering the solution collected in the filtering flask is called the residue vacuum filtration is most often used to remove impurities from a solution the solution to be filtered should completely fill the top of a Buchner funnelRead through each scenario. Under the scenario, write which lab safety rule is being broken and indicate the proper protocol for each. 1. Jane is participating in a lab in which she blows carbon dioxide into a beaker of chemicals. Some of the chemical bubbles up and gets in her eye. Her lab partners tell her to use the eye wash fountains to rinse her eye out; however, she does not know where the eyewash fountains are located. 2. Mike and Colleen had a lot of a chemical left from their investigation. They dumped the chemical in the sink and left the water running in the sink as they left class