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An unknown material begins to emit electrons from it's surface when exposed to photons with wavelengths shorter than 540 nm. Give the threshold frequency and the work function for this material.
How many carbon atoms are present in the smallest ketone which cannot exhibit enol-keto tautomerism
calculate the number of moles in 75.0g of lead(II) perchlorate trihydrate, Pb(ClO4)2 * 3H2O
What is the pH of a solution made by mixing 3.30 mL of 0.0045 molar Sr(OH)2 with 8.70 mL of 0.0011 molar Sr(OH)2 solution?
Using a sample of a compound containing only oxygen and chlorine reacts with an excess of H2 gas to give 0.206 g water and 0.278 g HCl . ClxOy in presence of H2 (g) → HCl + H2O all the oxygen
heat is removed from 200.0 g of water with an initial temperature of 30.0°C? The specific heat of water is 4.184 J/gdeg.
At 0.0oC, if the volume of air is 2.9 mL and the pressure of the atmosphere that day is 675 mmHg, what is the number of moles of air?
What is the percentage by mass of nitrogen atoms in ammonium phosphate, (NH4)3PO4
How much ice in grams would have to melt to lower the temperature of 358 g of water from 40 degrees to 0 degrees? (Assume that the density of water is 1.0 (g/ml)
A piece of metal weighing 5.10g at a temperature of 48.6 degree Celsius was placed in a calorimeter into a 20.0o mL of water at 22.1 degree celsius, and the final equilibrium temperature was found to be 29.9 degree celsius. What is the specific he..
coal can be used to generate hydrogen gas a potential fuel by the following endothermic reaction.cs h2og lt gt cog
What is the total number of moles of gas in the container. What is the number of grams of nitrogen in the container
What is the vapor pressure in mmHg of a solution prepared by dissolving 5.00g of benzoic acid (C7H6O2) in 100g of ethyl alcohol (C2H6O) at 35 C?
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