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The Ca content of a powdered mineral sample was examined four times by two methods believed to have similar precision. The results are shown below. Explain are the mean values for these two methods the same at the 90% confidence level?
Method 1: Methhod 2:0.0271 0.02710.0282 0.02680.0279 0.02630.0271 0.0274
Galvanic cell consists from CO/CO2+ standard electr0de and NI/NI2+ ELECTRODE. At what concentration of nicle electrolyte the theoretical
Calculate the mass of ethylene glycol required to lower the freezing point of 200 mL of water/ice by 4.5 degrees celsius. The K(f) for H20 is 1.86 degrees celsius/m. Assume the density of water is 1.00 g/ml.
An unknown sample of Cu2+ gave an absorbance of 0.292 in an atomic absorption analysis. Then 2.00 mL of solution containing 100.0 ppm (= µg/mL) Cu2+ was mixed with 95.0 mL of unknown, and the mixture was diluted to 100.0 mL in a volumetric flask. ..
1. calculate the mass in grams for a sample of al that absorbs 1.70kj when the temperature increases from 56 degree
Calculate the pH at each of the following points in the titration of 50.0 mL of a 0.50 M B(aq) with 0.50 M HCl(aq). (a) before addition of any HCl
Calculate the pH during the titration of 100.0 mL of 0.200 M HCl with 0.400 M NaOH. First what is the initial pH (before any NaOH is added)? What is the pH after 31.9 mL of NaOH are added?
Explain which of the following species is diamagnetic. Depict electron configuration boxes for all species every
If your titration solution is 0.431 M in NaOH, and the endpoint occurs at 13.20 mL of titrant, how many mmol of NaOH are required to reach the endpoint
Given that the total number of atoms on our planet remains fairly constant, how is it ever possible to deplete a natural resource such as a metal
The oxygen generated from the decomposition of the potassium chlorate converted some of the iron to iron(III) oxide. If the combined mass of iron and iron(III) oxide was 17.9 grams, calculate the mass of iron(III) oxide and the mass of the potassi..
Draw a planar structure for the following compound using dashed or solid wedges to show the stereochemistry of the substituent groups
Calculate the millimoles of sodium hypochlorite used in the reaction: 2.3mL of a 5.25% solution (Clorox). Compare this value with the quantity (150mg) of cyclohexanol (MM = 100.158 g/mol) to be used in the reaction
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