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Explain a layer of peat beneath the glacial sediments of the last ice age has a carbon-14/carbon-12 ratio that is 21.4% of that discovered in living organisms. Explain how long ago in yr was this ice age?
A buffer solution is prepared by dissolving 1.51 g NH3 and 3.85 g (NH4)2SO4 in enough water to make 0.500 L of solution.
Consider two different solutions of the same UV-absorbing compound. Upon UV-analysis, Solution B gave an absorbance of 1.5 and Solution A gave an absorbance of 0. 5 at the same wavelength. Solution B is higher in concentration by what ratio (or pe..
what is the concentration of the NaOH solution. The balanced equation is: 2 NaOH(aq) + H2C2O4(aq) Na2C2O4(aq) + 2 H2O(l)
1 ml of 0.1M aluminum nitrate, Al(NO3)3, is added to 1 ml of 6M ammonium hydroxide, NH4OH. What is the balanced net ionic equation
What is the final temperature, (in oC), after a 13.5 gram piece of ice at 0oC is placed into a styrofoam cup with 124.0 grams of water initially at 76.5oC? Assume no loss or gain of heat from the surroundings.
The resulting W3 was transferred to 500.0 mL of 1.00 M HCl. A 100.00 mL aliquot of the HCl solution required 10.02 mL of 0.09352 M potassium permanganate (KMnO4) to reach the purple endpoint. A blank required 0.13 mL. Balance the reaction below an..
A solution of Ba(OH)2 is standardized with potassium acid phthalate (abbreviated KHP), KHC8H8O4 (M = 204). If 1.530 g of KHP is titrated with 34.50 mL of the Ba(OH)2 solution, what is the molarity of Ba(OH)2. (A) 0.0217 M (B) 0.0435 M (C) 0.109 M ..
Which compound in each pair has a higher melting point. A) RbI or KI B) MgCl2 OR MgBr2
You are given a compound with an unknown concentration and you have five samples with known concentration of the compound. List 3 pieces of information you need to determine in order to calculate the unknown concentration spectrophotometrically.
How much heat in kilojoules is required to warm 10.0 g of ice, initially at -10.0^\circ C, to steam at 110^\circ C. The heat capacity of ice is 2.09 {\rm J}/{\rm g} ^\circ {\rm C} and that of steam is 1.84
a compound contains 10.13 c and 89.87 cl by mass. determine both the empirical formula and the molecular formula of the
if 69 kJ of heat is applied to a 1012 g block of metal, the temperature of the metal increasesby 11.4 degrees C. Calculate the specific heat capacity of the metal in J/g degrees C.
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