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Identify the uncertainty in position associated with an electron that is moving with a velocity of 289 km/s. The uncertainty in the velocity is 5.00%. The electron rest mass is 9.11e-31kg.
Determine the kinetic energy of an electron (in J) that is ejected from the sodium by light with a wavelength of 340 nm? Electrons are ejected from sodium metal by any light that has a wavelength s
Explain how many microamperes (1 A = 1 C/s) of electrical current are formed by a photoelectric cell that is bombarded by the 5.90x1013photons each second? T
240.1kJ is given off when 1 mol H2O (g) forms from its elements at a specific set of conditions. Under the same conditions, 283.4 kJ is given off when 1 mol H2O (l) produces from its elements.
A 237 -g piece of molybdenum, initially at 100 degrees C, is dropped into the 244-g of water at 100 degrees C. Describe the specific heat capacity of molybdenum when the system comes to the
Calculate the percent by mass of citric acid in the sample if an unknown solution contains citric acidC6H8O7 And sodium sulfateNa2SO4 if 1.731g of the solution requires 29.32ml of .487M NaOH
The active ingredient in the allergy medication Claritin contains hydrogen (H), carbon (C), nitrogen (N), chlorine (Cl), and oxygen (O). Its molecular formula is C22H23ClN2O2.
A 42.6-mL volume of hydrogen gas is collected over water at 20 degrees Celsius. A 42.0-mg sample of aluminum reacts with an excess of 6MHCl. The pressure of the "wet" hydrogen gas is adjusted to atm
Explain how many milliners of hydrogen gas evolved at STP? Assuming the complete reaction of 36.0mg of pure aluminum, according to the reaction described by equation 2Al (s) + 6H (aq)-> 2Al (aq)
Write down a thermo chemical equation for this reaction. When 2 mol of potassium chlorate crystals decompose to potassium chloride crystals and oxygen gas at constant temperature and pressure, 78.0
Hydrogen, H2, is used as a rocket fuel. The hydrogen is burned in the oxygen to form the water vapor. Estimate the enthalpy change per gram of water?
Ethanol, C2H5OH, is mixed with gasoline and sold as gasohol. Use the following to determine the grams of ethanol required to produce the 342 kJ of heat.
When the same quantity of heat has flowed into each block, which block will be warmer? A block of aluminum and a block of iron, both having the same mass, are removed from a freezer and placed outsi
For Co (NHMe-CHMe-CH2-PMe2)2(NO2)(SCN)(CL) Calculate the causes of isomerism? So far have found linkage isomerism from the SCN and the NO2 molecules. What other molecules cause isomerism
Determine the numbers of moles of HCl can be neutralized by one antacid tablet? A brand of antacid contains .200 g Al (OH)3 and .200g Mg(OH)2 per tablet.
All the atoms are in the first excited state, in He+ sample, all the ions are in the third excited state and in Li2+sample, all the atoms are in the fifth excited state in hydrogen sample.
How would one define sediment and sedimentary rock?Using a rock cycle model, how would one define magma based on that illustration?
Determine the approximate molar concentration of NaOH in the diluted solution when a 4-g mass of NaOH is dissolved in the 5mL of water. A 4-mL aliquot of this solution is diluted to 500mL o
Indicate the direction of the heat flow, in or out of the beaker, while the salt dissolves. After the salt dissolves and the water returns to room temperature, determine the value of q for t
Write down a balanced equation for the reaction between sodium hydroxide and benzoic acid. Explain why is the product of this reaction soluble in the aqueous layer when benzoic acid is only very sl
Compound X has a methylene chloride/water distribution coefficient of 4.6/ explain how much of a 2.0g sample of X dissolved in the 30 mL of water will be extracted by 20 mL of methylene chl
When 50.00 mL of 0.100 M AgNO3 and 50.00 mL of HCl are mixed in a constant-pressure calorimeter, the temperature of the mixture increases from the 22.30 to 23.00degree Celsius, the temperature
Determine how much caffeine should be obtained when a mixture composed of 20 mL of water layer with the 25mg of caffeine in it before extraction and 2 x 6 mL for the CH2Cl2 layers.
Explain why does CH2Cl2 solvent (lower layer) have higher density than the water while non-chlorinated solvents like hexanes and ether have lower density than the water, i.e. what exactly is i