Lab 4 - Part II - Env Investigation

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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. ·

If you wear contact lenses in the school laboratory, * you do not have to wear protective goggles. it's totally fine. You have nothing to worry about. take them out before starting the lab. advise your science instructor that you wear contact lenses.

FINAL Experiment 1- January 2021_-789644623 - Saved Layout Review View Table A friend of yours went panning for gold last weekend and found a nugget that appears to be gold. With your newfound scientific prowess, you set out to determine if it is really gold. Your tests show that the nugget has a mass of 7.6 g. Immersing the nugget in water raised the volume from 7.22 mL to 8.06 mL. The density of gold is 19.32 g/cm3. What will you tell your friend? acer

You work in a research organization that is looking for markers of various diseases that can be used as a diagnostic for the disease. It has been reported in the past that high levels of Cu are found in the sweat of people with cystic fibrosis. One of the research projects is focused on looking for high levels of Cu in samples that can be obtained non-invasively such as saliva, sweat, hair, nails, etc. The lab will analyze large samples for Cu. What instrument would you recommend purchasing to support this work, Atomic absorption spectrophotometer or an inductively coupled plasma atomic spectrophotometer? Explain the basis for your decision.

When purifying a sample of aspirin that was produced in the lab, the impure aspirin sample should be dissolved in a very cold solvent, so that solid impurities can be filtered and analyzed the next day or the next week. True or False?

Read 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

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.

What safety rules did Andrew break?

Which activities are likely to cause contamination of stock chemicals in the laboratory?

+ terface/acellus_engine.htm?ClassID=1467683063 Use the data below to determine the mass ratio of iron to oxygen for compound 2. Compound 1 2 Et onal Academy of Science. All Rights Reserved. Mass Fe (grams) 15.55 20.98 [20:1 Enter the answer that belongs in the green box. Iron Ratio Cmpd 2 Mass O (grams) 4.45 9.02 Sh Enter

What document may contain useful information about the hazards of a chemical? A Course syllabus B Chemical Hygiene Plan Chemical Risk Document D Material Safety Data Sheet

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.

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.