Draw a rough energy band
In what type of material is the energy gap between the valence and the conduction band the greatest? Na, Ge or diamond. Draw a rough energy band showing the valence and conduction bands in these materials.
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If 85g of propane C3H8 is completely combusted with oxygyen to form catbon dioxide and water ,how many grams of oxygen are consumed
Calculate the [SCN-] solution A, where 5.7 mL of 2.910?3 M NaSCN is diluted to 44.0 mL with 0.1 M Fe(NO3)3. Next calculate the [FeSCN2+] in the solutions prepared by diluting volumes of solution A with 0.1 M Fe(NO3)3 to a final volume of 1.0101 mL
10.8 g of particular gas occupies a volume of 41.2 dm^3 at 350 K at 3 atm. What would the volume be at 400 K if we assume the gas behaves ideally. what is the molar weight of this gas if we assume it behaves ideally
An empty 5.00- flask is charged with 0.450g of pure H2S(g) , at 25 degrees celsius What is the initial pressure of H2S(g) in the flask
A unit of heat energy that was formerly used frequently calorie. Look up the definition of calorie in your textbook or a handbook and record it here.
If a solution contains 0.01 M Ca^2+, 0.01 M Zn^2+, and 0.01M Ni^2+ ions and you want to separate them using aqueous (NH4)2C2O2, which ion will precipitate first as an oxalate, CaC2O4, ZnC2O4, or NiC2O4
How many moles of KBr are present in 150 mL of a 0.275 M solution? (c) How many milliliters of 6.1 M HCl solution are needed to obtain 0.100 mol of HCl?
A 3.12 g sample of solute is dissolved in 35.0 g of water. The freezing point of this solution is found to be -1.23°C. What is the molar mass of the solute? For water, Kf = 1.86 degkg/mol.
Would the calculated value of k, the true rate constant, be in error if the concentration of dye was actually doubled the value you were told? Explain your answer.
If 67.0 mL of 0.119 mol/L NaOH(aq) and 35.0 mL of 0.193 mol/L HA(aq) are mixed, then what is [HA] at equilibrium? Assume that HA is a weak monoprotic acid with pKa=6.23 at 25oC.
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