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Which set of these statements is FALSE? i) Electrical conductivity of a pure semiconductor like Si results from the thermal movement of electrons into the conduction band ii) pure Si doped with arsenic would act as a p-type semiconductor iii) insulators have large band gaps a. i) only b. ii) only c. iii) only d. i) and ii) only e. none are false
A glass plate is 5 cm x 10 cm in size and is coated on one side with a 1 micrometer thick layer of Ag to make a mirror. What is the corresponding mass of the Ag layer and how many atoms comprise it
What is the pH of a solution that has a formic acid (HCHO2) concentration of 0.39 and a potassium formate (KCHO2) concentration of 0.12? The Ka for formic acid is 1.7 x 10-4.
How will buffer capacity change if you add 0.2 M of benzoic acid to the buffer made of 0.3 M of acetic acid
how many carbons does the sample contain
Does a reaction with a delta H of 14kj/mol and a delta S of 150 J/molK at 298K favor reactants or products
what is the energy of a single UV photon and a mole of UV photons having a wavelength of 25 nm?
If you were to carry out saponification of ethyl tridecanoate, would you expect the product to generate foam/froth when mixed and agitated with water? Explain.
A gas sample has an original volume of 650 ml when collected at 750 mm and 30°C. If a change is made in the gas temperature which causes the volume of the gas sample to become 800 ml at 1.00 atm, what is the new temperature
Propose a reasonable reaction mechanism for the sodium hypochlorite oxidation of 3-heptanol. Give the IUPAC name of the expected product. What other oxidizing agents may be used to carry out this oxidation
How many moles of sodium acetate must be added to 1.8 L of 0.25 M acetic acid to give a solution that has a pH equal to 4.68? Ignore the volume change due to the addition of sodium acetate.
When you initially standarized your NaOH sollution, you diluted your HCl stock solution and added water to it. If you used 24.8 ML of 0.18 M HCl stock solution and added another 26.2 mL of water, what is the new molarity of the acid
The reactor feed is 10 gmol/min ethylene oxide and 30 gmol/min water. Why is water excess reactant. If the fractional conversion of ethylene oxide is 0.92 and the selectivity is 0.85, what is the reactor outlet composition and the yield
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