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The Earth is approximately 4.5 billion years old. Life first appeared 3.5 billion years ago with prokaryotic cells. The first eukaryotic cell did not appear until 2.5 billion years ago approximately. We know this because of the fossil record. How did those first eukaryotic cells get here? What are your ideas concerning the evolution of the first eukaryotic cells? Do not concern yourself with how life first formed, rather just concern yourself with how eukaryotic cells first evolved. Please look at this from a scientific standpoint and not a religious point of view.
On mole of a weak acid HA was dissolved in 2.0 L of solution. After the system had come to equilibrium the concentration of HA was found to be 0.45 M. Compute Ka for HA.
The most common source of copper (rm Cu) is the mineral chalcopyrite (rm CuFeS_2). How many kilograms of chalcopyrite must be mined to obtain 230. g of pure rm Cu?
Pressures up to 3000 (atm) are measured with a dead-weight gauge. The piston diameter is 0.17 (in). What is the approximate mass in (lbm) of the weights required
2.00 L of H2 at a pressure of 368 torr and 1.00 L of N2 at an unknown pressure. If the total pressure in the flasks is 336 torr after the stopcock is opened.
Consider the reaction of 1-butanol with PCC (pyridinium chlorochromate). Draw only the organic product derived from 1-butanol. If the product is an ion, do not draw the counter ion. If the given reaction has more than one step, give only the final..
pure benzene has a normal freezing point of 5.5degc. a solution containing 11.4g of a molecular substance dissolved in
Assuming no chemical reaction occurs and the liquids are capable of safely and thoroughly mixing together with one another
Sodium has a density of 0.968g/cm3 and crystallizes with the body-centered cubic unit cell. Calculate the radius of a sodium atom.
The vapor pressure of water at 32 C is 35.7mmHg. What is the vapor pressure of water-ethylene glycol solution at 32 C? Ethylene glycol is non-volatile.
Can anyone help me with the reaction sequence AND stepwise mechanism for the mono-nitration of phenyl methyl ketone
If you have a sodium salt of stearic acid and neutralize it with acid, the solubility changes. Explain those relative solubility differences of these two chemical species in a solvent like hexane.
What is the longest wavelength of radiation with enough energy to break carbon-carbon bonds
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