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Question: Define the concept of half life of an unstable atom. If you have 24 grams of an unstable atom with a half life of 5,000 years, how many grams would be left after 15,000 years? Explain how an isotope of Uranium can be used to date the age of the earth. About what is the age of the earth by this method?
suppose you have two 100ml graduated cylinders. in each cylinder there is 40.0ml of water. you also have two cubes one
when silver ions are added to the red fescn2 ions the red solution disappeared and a white precipitate of agscn formed.
Problem- The condensation of steam to water at 90 degrees Celsius causes the entropy of the steam to decrease. Why. What must be true of the process of steam condensation if the second law of thermodynamics is satisfied.
1.35 mol of N2 at 19 deg C, 6.35 bar undergoes a transformation to the state described by 210 deg C and 1.90 bar. Calculate deltaS if Cp,m*K*mol/J = 30.81 - 11.87*10^-3T/K + 2.3968*10^-5T^2/K^2 - 1.0176*10^-8T^3/K^3
Imagine a unit of charge called the zorg. A chemist performs the oil drop experiment and measures the charge of each drop in zorgs.
Afterwards he feels guilty and decides to work off the excess calories by walking up 6 flights of stairs 3 times. Calculate the energy.
Here are four of my question, my professors wants us to represent this newman projection and sawhorse projection. (1) a gauche conformation of hexane viewing down the C2-C3 bond
What is the mass of H2SO4 in a 48.4-cm3 sample of sulfuric acid that has a density of 1.52 g.cm-3 and which consists of 55.2% H2SO4
A 3.9 g sample of Colorado oil shale is burned in a bomb calorimeter, which causes the temperature of the calorimeter to increase by 5.0°C.
If a student weighed a copper wire that was significantly larger than the size recommended in the procedure.
How much titanium (IV) chloride must react with excess oxygen to prepare 175 grams of the pigment if the reaction is only 85% efficient (% yield)
If an aqueous solution has a hydroxide ion concentration ([OH-]) of 5.94 x 10-5 mol/L, what is the hydronium ion concentration? 4.48 x 10-12 mol/L 1.68 x 10-10 mol
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