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Sparklers enclose powdered iron. Explain why do sparklers burn more rapidly that a piece of iron wire? Select all that apply.
The larger surface area of the iron powder raises the rate of reaction.Converting the iron to a powder makes it a catalystConverting the iron to a powder makes it an ionic compound which reacts more rapidlySmaller particles contain a lower energy of activation than larger particlesLarger particles react more quickly than small particles.
Methan can be considered an ideal gas at 250 degree and o.8 MPa. One kg of Methane in a piston/cylinder device undergoes a reversible isothermal expansion to 0.3 MPa. Explain how much heat is transferred
How many grams of dry NH4Cl need to be added to 2.00 of a 0.100 M solution of ammonia, , to prepare a buffer solution that has a of 8.64? Ka for ammonia is 1.8*10^-5.
Write a balanced equation for the combustion of heptane, C7H16, in oxygen, , forming the products carbon dioxide, and water, H2O. How many grams of water will be produced by the complete reaction of 7.88 grams of heptane?
In which pair of substances below does the substance with the greater entropy not follow the substance with the lesser entropy
in the manufacturing of computer chips cylinders of silicon arecut into thin wafers that are 3.00 inches in diameter
Zinc metal reacts with yellow crystals of sulfur in a fiery reaction to produce a white powder of zinc sulfide. A chemist determines that 65.4 g of zinc reacts with 32.1 g of sulfur. How many grams of zinc sulfide could be produced from 12.0 g of ..
The standard free-energy difference between the two chair conformations of isopropylcyclohexane is 9.2 kJ mol-1 (2.2 kcal mol-1). What is the ratio of concentrations of the two conformations (axial and equatorial) at 25 °C
predict the products from the reaction of the following compounds with excess h2cro4 in the presence of sulfuric acida.
what is the charge of the carboxyl group in an amino acid at physiological pH. Please explain the charge. Also what is the charge above and below physiological pH
Write a balanced chemical equation when Magnesium metal burns in oxygen to form magnesium oxide, MgO
The three main components of dry air and the percentage of each are Nitrogen(78.08%), oxygen (20.95%), and argon (0.93) A) calculate the partial pressure of each gas in a sample of dry air at 760mmHg
the solubility of n2 in water is 2.2 x 0.0001 g in 100 g of h2o at 20 celcius when the pressure of nitrogen over the
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