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What is the ph of the buffer that results when 12.0 g of NaH2PO4 and 8.00 g of Na2HPO4 are diluted with water to a volume of 0.50 L? ( ka of H2PO4 = 6.2 X10-8, the molar masses of NaH2PO4 and Na2HPO
Determine the magnitude and direction of the force between two parallel wires 15m long and 6.0cm, Determine the magnitude of the force between two parallel wires
Identify and discuss a specific legacy left by either the classic Greek poleis or the Achaemenid dynasty of the Persian empire.
One icy day, my brother Nate decides to load boxes into his commissary truck by sliding them up a ramp into the back of his truck, find the minimum velocity necessary such that when the box comes to
Molten carbonate fuel cells fueled with H2 convert as much as 60% of the free energy released by the formation of water from H2 and O2 into electrical energy. Determine the quantity of electrical en
Trace the legacy of the Roman Empire after its decline. What two successors maintained Roman practices long after Rome fell from the center of trade and politics?
A patient is going to be prescribed bifocals which will be 3.20 cm from the eye, Without the bifocals, what is the patient's near point
From the following chemical reactions determine the relative Bronsted-Lowry acid strengths (strongest to weakest). HCLO4 (aq) + H2O (l) ----> H3O (aq) + ClO4- (aq)
During the third and second millennia B.C.E. migrations of peoples such as the Hebrews, the Phoenicians, and the Indo-Europeans throughout Eurasia reshaped existing civilizations and gave rise to new
In the figure below, the converging lens' focal length is 13 cm, d = 18 cm, and the diverging lens' focal length is -12.6 cm, How tall is the image formed by the diverging lens
The reaction A->B follows first-order kinetics with a half-life of 21.7 hours. If the concentration of A is 0.023 M after 48 hours, what is the initial concentration of A?
Compare and contrast the ways in which geographic isolation shaped the development of the Americas and sub-Saharan Africa as distinct from Eurasia and northern Africa
Calculate the amount of solute in g needed to prepare 431.5 g of 8.85 %(m/m) LiNO3 solution.
Compare and contrast the development of sedentary, agricultural civilizations in the Americas with that of those in the Afro-Eurasian landmass. In your essay consider the timeframes of such developmen
An electron has an initial velocity of 2.00 ? 106 m/s in a uniform 4.00 ? 105 N/C strength electric field, How far does the electron travel before coming to rest
Explain the ways in which the Indus, the Nile, the Tigris and Euphrates, and the Yangzi and Yellow Rivers shaped the development of ancient Chinese, Indian, Egyptian, and Mesopotamian civilizations.
Americium-241 is used in some smoke detectors. It is an alpha emitter with a half-life of 432 years . How long will it take in years for 40.0 % of an Am-241 sample to decay
A 225-m length of wire stretches between two towers and carries a 180-A current. Determine the magnitude of the force on the wire due to the Earth's magnetic field
An unknown radioactive substance has a half-life of 3.20 hours. If 38.7g of the substance is currently present, what mass was present 8.00 hours ago
Discuss the ways in which animal and plant cultivation of the Neolithic Age changed humanity economically, politically, religiously, socially, and technologically.
Human evolution has been both a biological and cultural process. Identify and discuss the major biological and cultural developments of this process from the advent of Australopithecine to the Neolith
How long does it take for the radioactive isotope to decay to 4.9×10?3 mg? (Assume no excretion of the nuclide from the body.)
A charged object has a potential of 40 V at a distance of 3 m. If the distance is increased to 42 m, then what will be the new potential
Explain the ways in which the Indus, the Nile, the Tigris and euphrates, and the Yangzi and Yellow River shaped the development of ancient Chinese, Indian, Egyptian and Mesopotamian civilizations.
You are using a Geiger counter to measure the activity of a radioactive substance over the course of several minutes. If the reading of 400 counts. has diminished to 100. counts after 35.2 minutes ,