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The optical device consists of two lenses with focal points f1 = 1 m and f2 = 1.5 m which are L = 20 cm apart. We place an object 5 m on the left from the device. What is the position of the image? What is the total focus length ftot of this device?
Analysis with an elaborate instrument indicates that substance A contains two elements. Substance B and substance C react to give a new substance D
What happens when an inert gas is added to an equilibrium state with out change in pressure. why
A 258-mL sample of MEK, an industrial solvent is found to have a mass of 0.599 g at 0.988atm and 100°C. Explain what is the molar mass of MEK
A strong acid is generally used to catalyze the Fischer esterification of carboxylic acids. What two steps in the reaction are accelerated by the presence of strong acid, and what function does the acid play in each of these steps
how do you convert the wave functions for the 3s3p3d orbitals of hydrogen so that they can be entered into excel? in
Calculate the amount of heat evolved in the complete oxidation of 8.17g of al at 25 degrees celcius and 1 atm pressure. delta H of f for al2O3 id -1676kj/mol
Question- You are asked to go into the lab and prepare an acetic acid-sodium acetate buffer solution with a pH of 4.30 +/- 0.02. What molar ratio of CH3COOH to CH3COONa should be used
Question- A solution 25.0 mL NaCH3COO and 10.0 mL 1.0 M CH3COOH has a pH of 5.18. Find the Ka of acetic acid and calculate the pH of the buffer after 2 mL of 1.0 M NaOH are added to the solution.
suppose the experiment was done with 1.0m H3PO4 as the acid. What would be the stoichiometric ratio, mol H3PO4/mol NaOH at the intersection of ascending and descending portions of the graph?
Sr(s) reacts very vigorously in excess 1 M H4NHCO3 as a ppt and H2 (g) are formed among the products. For this system in a closed container, write the correct equations for each half reaction and net redox reaction noting that incompatible product..
A 75.0g sample of an unkown substance absorbed 2.93kj of energy as it changed from a temperature of 23.2 C to 95.4c.
An electric field should exist inside a conductor that carries a current. Explain how is that possible in view of the fact that in electrostatics we concluded that the electric field must be zero inside a conductor
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