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A bicycle tire is filledto a pressure of 4.42atm(65psi) at a temperature of 12 degrees celsius. If the temperature of the tire increases to 33 degreecelsius, what is the pressure in the tire? Assume
A radio active substance has a half-life of 46.5 minutes. How many grams of the radio active substance will remain in a 822.4g sample after four hours have elapsed?
A sample of a radioactive substance used in detecting skin cancer produced 592 counts in one minute at the beginning of a test and acount of 451 counts in one minute after one day.
A chemically correct mixture of gaseous methan and air at 77 F is admitted into a nozzle where it completely burns. Calculate the nozzle exit velocity in feet per second if the exit temperatur
A gas syringe at 20 Celsius contains 20ml of Co2 gas. The pressure of the gas in the syringe is 1.0 atm. What is the pressure in the syringe at 20 Celsius if the plunger is depressed to10ml?
Iron forms a magnetic oxide with the formula Fe3O4 that contains both Fe2+ andFe3+ ions. What is the average oxidation number of iron in this oxide?
In one such preparation,water (20 mL), sodium bromide (20 g) and cyclohexanol (10.5 mL, density 0.96) were mixed andconcentrated sulfuric acid (20 mL; density 1.85) was added dropwise to the swirled
A student develops a TLC plate without replacing the top of the developing chamber. How does this omission affect the development of the TLC plate?
A peroxidase enzyme isolated from human red blood cells was foundto contain 0.29% selenium. What is the minimum molar mass of the enzyme?
A well insulated storage tank of 60m3 contains 200 L of liquid water at 75 deg C. The rest ofthe tank contains steam in equilibrium with the water. Spent process steam at 2 bar and 90 percent qualit
There are 3 substrate molecules and 1 enzyme molecule. Usig the Markov chain formalism write a transition matrix that will dteremine the probability after n cylces that two molecules are product an
A salt bridge used between copper nitrate and zinc nitrate was soaked with a saturated ammonium nitrate solution. In which direction do the ammonium ions move when the salt bridge completed to
Mothballs are composed primarily of the hydrocarbon naphthalene (C10H8). When 1.025 g of naphthalene is burned in a bomb calorimeter, the temperature rises from 24.25 C to 32.33 C.
Consider the mixed aldol condensation reaction of acetophenoneand 2,2,5,5-tetramethylcyclopentanone in the presence of sodium hydroxide.
How can an equilibrium system contain small and unchanged amounts of product, yet have large amounts of the reactant? What can yousay about the relative size of Keq for such an equilbrium?
What is the wavelength in nm of the radiation emitted when anelectron in hydrogen atom moves from the ni = 5 level tothe nf = 3 level?
Consider the following reaction:Ni2+(aq) +Sn(s)-> Ni(s)+Sn2+determine the minimum ratio of the tin ion to the nickel ion necessary to make the reaction spontaneous as written.
Find the concentration of calcium ions in a solution made by adding3.50 g of calcium fluoride to 750. mL of 0.125 M NaF. [ForCaF2, Ksp = 3.95 ×10-11
We learned that silicon is the second most abundant element in Earth's crust, accounting for more than one-fourth of the mass of the crust.
What mass og magnesium phosphate is produced when7.00g of magnesium hydoxide reacts with 9.00g of phosphoricacid?
When ethanol is heated with an excess of acidified potassium dichromate,it is converted to ethanoic acid:What other substance and conditions are needed to carry out this reaction?
0.3g of magnesium is mixed with 50ml of 1mol/L HCl. The temperature of the solution increased from21.10C to 510C, What is the molarenthalpy of combutsion for magnesium?
What are the mole percents of XeF4 and XeF6 in the product?15.9% ; 84.1%I really do not know how to go about doing this question.Would appreciate some help.
Magnesium reacts with HCl to produce MgCl2 and hydrogen gas. How many Milliliters of a 1.85 M HCl solution completely react with 4.00 grams of magnesium?
Calculate the mass of methane that must be burned to provide enough heat to convert 294.0 g of waterat 32.0°C into steam at 122.0°C. (Assume that the H2O produced in the combustion reaction