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During a routine check of the fluoride content of Gotham City\'s water supply, the following results were obtained from replicate analyses of a single sample: 0.511 mg/L, 0.487 mg/L, 0.511 mg/L, 0.487 mg/L, and 0.519 mg/L Determine the mean and 90% confidence interval for the average fluoride concentration in this sample.Mean = 0.503mg/LFind 90% confidence interval
Calcium chloride is added to a polymer solution of sodium alginate to cross-link the polymers, reating a thicker mixture which is used to add texture of food (like milk shakes). What is the explanation for why this happens?
A 50.0-mL sample of 2.0 x 10-4 M CuNO3 is added to 50.0 mL of 4.0 M NaCN. Cu+ reacts with CN- to form the complex ion [Cu(CN)3]^2: [Cu(CN)3]^2- Cu+ (+) 3CN- K = 1.0 x 10^-9
Calculate the transformation rate for the austenite-to-pearlite transformation at 650 °C and at 600 °C. Show the relationship(s) you used to arrive at your answers.
What is the pH of 1.0 x 10^-4 M phenol where ka = 1.3 x 10^-10? This is a weak acid under dilute conditions. You need to take into account water self-dissociation to find the hydronium concentration.
A sample of water 53 g with a temperature of thirty six degree celsius is combined to 250 grams of H 2 O at 91 degree Celsius in an insulated container. Determine the final temperature after thermal equilibrium is reached?
50.00ml of BiO3- is titrated with 26.43ml 0.02982M Fe2+. What is the molar concentration of BiO3-? How many mg of NaBiO3 were in the 50.00ml sample? [BiO3-] = _______________ M mNaBiO3 = _______________ mg
Select each of the reactions and observe the reactants taking part in the reactions. Suppose you are carrying out each of these reactions starting with five moles of each reactant. Observe that some reactants are in excess whereas some reactants l..
It required 71.5 mL of a 0.155 M KNO3 solution to fully react the copper in the ore sample. What was the percent copper in the ore.
What is the final concentration of a solution made from 7.1 mL of 0.8 M CuSO4 and 14.3 mL of water?
The bonding in BF3 requires formation of hybrid orbitals on boron. If the molecule is oriented in the xy plane, what is the identity of the unfilled p orbital on boron.
What is the heat change in J associated with 37 g of gaseous methanol at 89 oC changing to liquid at -64 oC?
A critical reaction in the production of energy to do work or drive chemical reactions in biological systems is the hydrolysis of adenosine triphosphate
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