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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 gas mixture being used to simulate the atmosphere of another planet consists of 324 mg of methane, 217 mg of argon, and 228 mg of nitrogen.
With Niemann-Pick Disease, discuss how lipid metabolism is affected, particularly which enzyme(s), and how the body is affected
Pick the words that correctly finishes the following sentence. A reaction will always be spontaneous if it is and there is an increase in disorder
Calculate the concentration of the hydronium ion in a 3.433 * 10^(-2) M solution of potassium perchlorate acid to the correct number of significant figures or decimal places.
nickel acetate in a volumetric flask and add water to a total volume of 375 mL What is the concentration of the nickel cation? What is the concentration of the acetate anion?
The flask is opened and more gas is added to the flask. The new pressure is 795 mm Hg and the temperature is now 26 °C. How many mol of gas are in the flask?
If 155mL of wet {grm{H}}_2 is collected over water at 24 ^circ {rm C} and a barometric pressure of 739torr , how many grams of {grm Zn} have been consumed.
If 100.0 grams of copper (Cu) completely reacts with 25.0 grams of oxygen, how much copper(II) oxide (CuO) will form from 140.0 grams of copper and excess oxygen?
If 5.00 g Br2 and 1.10 g NH3 react according to the equation below, what is the maximum mass of ammonium bromide produced. 3 Br2() + 8 NH3(g) ® 6 NH4Br(s) + N2(g)
At what pH will precipitation of Al(OH)3 begin if 5.40 lb of aluminum sulfate, Al2(SO4)3, is added to 1150 gallons of water (with a negligible change in volume)
If a protein sample has a molar mass of approximately 14,000 u, what is the expected freezing point depression when 1.00g is dissolved in 50.0mL of distilled water
A mole of hydrogen atoms contains 6.02 x 1023 atoms and occupies 22.4 L. How many hydrogen atoms are contained in 25.00 mL of this gas?
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