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The minimum energy required to cause the photo electric effect in potassium metal is 3.69*10^-19 J. will photoelectrons be produced when light shines on the surface of potassium?if 400 nm radiation is shone on potassium,what is the velocity of the ejected electrons
A 0.300 M solution of an acid, HZ, has a pH = 1.301. What is the value of the ionization constant, Ka, for this acid?
Analysis with an elaborate instrument indicates that substance A contains two elements. Substance B and substance C react to give a new substance D.
how many moles of each of the following strong electrolytes are needed to give the same freezing point lowering as 3.0 mol of the nonelectrolyte ethylene glycol in 1 kg of water? a)CH3-OH, a nonelectrolyte. b)KNO3
If a raindrop weighs 53 mg on average and 5.1 105 raindrops fall on a lawn every minute, what mass (in kg) of rain falls on the lawn in 3.0 h.
The "Zebra" cell was invented in 1985 in South Africa as part of the "ZEolite Battery Research Africa" project, and is used in all-electric municipal buses and other vehicles.
traditional MALDI mass spectrometry, what are two factors that limit the spatial resolution that can be obtained in imaging mode?
Why is sodium hydroxide added to the solution of thiamine hydrochloride
Explain why the elimination reaction in acetone promotes an E2 mechanism while water promotes and E1 mechanism? Which product is more thermodynamically stable, the E or Z isomer?
enzyme responsible for part of the signaling cascade that leads to replenishment of the stomach lining is inhibited by these drugs. How does it differ from the COX-2 enzyme responsible for inflammation?
how much energy is released when 89 grams of water vapor (steam) is cooled from 503 K to 354 K?
when making ice cream, the temperature of the ingredients is decreased to below the freezing point of pure water by using a surrounding water bath that contains a large amount of table salt, NaCl.
A saturated solution of lead iodate in pure water has a lead ion concentration of 4.0 x 10¯5 mole per liter at 25 °C
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