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A glass capillary tube is placed in a beaker containing a substance in its liquid state. After an hour the liquid shows no tendency to move up the tube.
Determine the name of the group that contains sodium? Oxygen? The last vertical row? Explain what has the largest ionization energy: beryllium, lithium, nitrogen, or oxygen; why?
Determining all the five possible electron domain geometries is it possible for any covalent molecule which is having only one central atom and having two or more attached atoms and one non-bonded e
In the presence of a catalyst, Ea is reduced to 32kJ. The activation energy of a certain reaction is 55 kJ. For the reaction, ΔH is +25 kJ. Sketch a diagram and add the curved for the catalyze
What will be the pH change of the stomach acid resulting from the ingestion of one Regular Strength Maalox, assuming the volume of the stomach to be 1.0 L.?
Determine the heat given off by the burning the Mg, in KJ/g and in KJ/mol. A 0.1375-g sample of solid magnesium is burned in a constant-volume bomb calorimeter that has a heat capacity of 3,02
In the benzyl synthesis the reaction mixture cools to 50-60degrees C before addition to water. The temperature does not need to be exact. Discuss how can you tell without using thermometer that the
If 10.0mL of 0.100 M NaOH titrate is to be used to back titrate the excess 0.100 M HCl from the analysis of one-third of a Maalox tablet, determine the numbers of milliliters of
The quality control manager for ENTA Inc. should make decision whether to accept (a1), further examine (a2) or reject (a3) lot of incoming material.
The hydrochloric acid that is not neutralized by the antacid is titrated to a bromophenol blue endpoint with 6.22mL of 0.0827M NaOH when a 0.196-g sample of a CO32- antacid is di
Calculate the mass of CaCO3 in the sample, assuming the active ingredient in the antacid sample is CaCO3. Determine the percent active ingredient in the antacid sample?
Calculate how many grams of calcium were added to the water? What is the molality of the resulting calcium hydroxide solution when an unknown mass of calcium metal is placed in 200g of water, 103mL
Identify the molarity of the hydrofluoric acid solution? In a titration 33.21ml 0.3020M rubidium hydroxide solution is required to exactly neutralize 200.00mL hydrofluoric acid solution.
Determine what kinds of intermolecular attractive forces (dipole - dipole, London, hydrogen bonding ) are present in the following substances:
Evaluate the wavelength of a photon (in nanometers) that is emitted when an electron moves from the n1= 5 to the n2= 2 state in a hydrogen atom? Explain what will be the color of the emitted photon
You have been inquired to design the cryogenic thermometer, for estimating temperature of the bath of liquid helium. (company has some cool toys.) What kind of thermocouple would be appropriate for
Determine the Ph at the equivalence point for the following titration: 0.20 M HCl versus 0.20 M methylamine (CH3NH2).
Polyhalogens, define polyhalogens their structure and chemistry of polyhalogens also brief explanation of pseudohalogens
Calculate how many liters of O2 reacted with excess SO2 according to the following equation: 2SO2 + O2 = 2SO3 if 640g of SO3 are produced at the STP.
Determine the rate constant and half life for the radium decay. Starting with 1.0g of the radium sample, what is the activity after 500yr? The molar mass of Ra is 226.03 g/mol
Determine the number of moles of H2 that are present at equilibrium if a mixture of .300moleof CO and .300 mole of H2O is heated to 700 degrees Celsius in a10.0 L container at the 700 degrees Celsiu
Outsourcing is the important issue for producers and service providers. Give at least two benefits and two disadvantages of outsourcing. Give references to all discussions as required.
Estimate how many moles of Helium will be in this balloon if the volume changed to 71.7 L when a rubber balloon contains .850 moles of helium had a volume of 17.9 L when the temperature was 23.6 deg
The distribution coefficient, k= (conc. In ligroin/ conc. In water), among water and ligroin for solute A is 7.5. Explain what weight of A would be removed from a solution of 10 grams of A in 100 mL
How many moles of benzoic acid are present? Determine how many moles of sodium bicarbonate are contained in 1 mL of a 10 % aqueous solution?