Write down three most common errors in thermogravimetric analysis. Identify them as systematic or random errors and discuss how you can minimize the errors for better results.
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Write down three most common errors in thermogravimetric analysis. Identify them as systematic or random errors and discuss how you can minimize the errors for better results.
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- professor Scimemi has accepted you as a Master’s student and you are involved in a project that studies the cellular basis of neuropsychiatric diseases. For your electrophysiology recordings you have to make a recording solution containing (in mM): 119 NaCl, 2.5 KCl, 2.5 CaCl2, 1 MgCl2, 26.2 NaHCO3, 1 NaH2PO4, 22 glucose. You need 800 ml of it. How much KCl do you need to weigh out? Hint: we only care about KCl here. (MW KCl is 74.55 g/molFor the following organic reaction identify the mystery reactant R, its stoichiometric coefficient N, and any other substance X that must be present. CH3 CH₂ =C-C-CH=CH₂ || CH₂ Chemical formula of R: Stoichiometric coefficient N: + NR Must any other substance X be present? X CH3 | CH3 CH–CH–CH2–CH3 T CH3 If you said an additional substance X must be present, enter its chemical symbol or formula: 0 yes no 90 X 51. Which reaction most certainly results in a negative ASrxn? a. H₂O(g) b. CaCO3(s) H₂O(s) Cao(s) + CO2(g) c. CuSO, 5H2O(s) CuSO4(s) + 5H2O(g) d. 140, (g) + 3NH.NO,(s) + C10 H22 (→ 3N2(g) + 17H₂O(g) + 10CO2(g) e. CO₂(aq) CO₂(g)
- 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.Real life applications of standardization of NaOH.The literature value for the Ksp of Ca(OH)2 AT 25 degrees celsius is 4.68x10-6. How does the value you determined in the lab compare with this result? Explain what may have caused your result to differ from this value. (Clearly explain what may have happened. Should you have obtained the literature value, clearly explain how this could have happened.) Value determined in the lab: 3.65x10-6. 2. How would your results have changed if there had been a trace of acid impurity present in the Erlenmeye flasks you used?
- Please rewrite the chemicalsPlease help rewrite the chemicalsPAPER CROMATOGRAPHY • Define chromatography • Demonstrate an understanding of the process of chromatography • Describe the steps involved in a chromatography investigation Explanation Coloured inks are often made up of several different inks. Each colour of ink will get carried a different distance by the water, allowing you to see all of the different inks. Try this with different colours to see what actually goes into a colour. This technique is called chromatography and can be used in chemistry to find out what is in an unknown mixture. II. Materials .Felt tip pens (non-washable) . Kitchen roll .A bowl or cup . Water • Scissors III. Health and safety • Make sure that you thoroughly clean any equipment after the experiment before using for food IV. Procedure Method 1 1. Take a sheet of kitchen roll and draw a simple picture with a non-washable felt tip pen. 2. Place the sheet over an empty bowl. This is to keep the paper from getting too wet. 3. Carefully add a few drops of water…
- Analytical chemistry is a particular field within the broader spectrum of the chemical sciences, in which many times the focus of analytical experiments is to develop new methods to analyze compounds, either structurally or by determining concentrations of compounds. One of the processes analytical chemists use to determine the exact concentration of a working solution is called standardization. In your own words, describe the differences between a primary, secondary, and tertiary standard, and describe the underlying concept behind the standardization process. Why is it done?The rusting of iron is an exothermic reaction, 4 Fe (s) + 3 O₂ (g) → 2 Fe₂O₃ (s). When the coatings are remove to expose metal surface, the system will _____. * a. Remain constant b. Shift to the right c. Unaffected d. Shift to the leftA sample of rainwater was collected from four separate locations across theMetroplex. Each sample was measured once by two separate methods for the presence ofsulfate. Determine whether the two methods are equivalent with respect to giving thesame answer for [SO42-].
