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Sand consist mainly of silicon dioxide. When sand is heated with an excess of coke (carbon), pure silicon and carbon monoxide are produces.
a. Write a balanced equation for the reaction
b. How many moles of silicon dioxide are required to form 12.72 g of silicon?
c. How many grams of carbon monoxide are formed when 44.99 g of silicon is produced?
When blood is donated, sodium oxalate solution is used to precipitate Ca2+, which triggers clotting. A 104 mL sample of blood contains 9.7 x 10^-5 g Ca2+/mL. A technologist treats the sample with 100 ml of .1550 M Na2C2O4. Calculate [Ca2+] after t..
A compound of chromium and oxygen contains 18.9 g of the nonmetal and 41.1 g of the metal. How many grams of chromium are in 1.22 kg of the compound
How much limestone (CaCO3) in kg would be required to completely neutralize a 5.2 x 10^9 L lake containing 5.0 x 10^-3 g of H2SO4 per liter?
What is the molar solubility of PbI2 in water. For PbI2, Ksp=7.9x10-9. You may assume that the ions do not form ion pairs in solution. Give your answer in moles per litre, accurate to two significant figures.
A 22.9-g sample of liquid hexane (specific heat = 2.27 J g-1 oC-1), initially at 11.7oC, is heated until its final temperature is 35.7oC. How much heat was added to the sample
Inspection of an IR spectrum rarely reveals the identity of the compound. However, one can often identify what?
The overall reaction in the lead storage battery used in your car is Pb (s) + PbO2 (s) + 2 H+ (aq) + 2 HSO4 - (aq) ? 2 PbSO4 (s) + 2 H2O (l) a. For the overall cell reaction
The best design for rockets is one in which both fuel materials run out at the same time to minimize excess mass. If the total mass of both components in a decaborane/oxygen rocket must be 3.011E+6g, what mass of liquid oxygen should be used
compare the pH of a .040 M HCl solution with that of a .040 M H2SO4 solution. (hint: H2SO4 is a strong acid; Ka for HSO4- = 1.3 X 10^-2)
20.0 mL of a 0.10M weak acid (Ka= 1.56X10^-6) is titrated with a 0.20M strong base. a. What is the pH initially, before any titrant is added
Standard state is the physical state in which a substance is stable at 1 atm of pressure and a specified temperature
If you start with 5.00g Cu(s) what would the theoretical yield of copper (I) oxide. If the reaction isn't very efficient and only has a 26% yield, how many grams of copper(I) oxide would actually be produced
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