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All living things contain carbon. Most of this carbon is stable carbon-12. However, a small percentage will be carbon-14, a radioactive isotope of carbon that decays with time. As living things eat and breath, carbon is constantly recycled and therefore the percentage of carbon-14 remains constant. It's not until death that the percentage of carbon-14 will begin to diminish from decay. Because radioactive decay is a first-order process, the integrated rate law for a first-order reaction can be rewritten as {\rm fraction~remaining} = 0.5^{(t / t_{1/2})} where t is the time elapsed and t_1/2 is the half-life. The half-life of C-14 is 5730 years. A fossil was analyzed and determined to have a carbon-14 level that is 67.0\% that of living organisms. How old is the fossil? Express your answer with the appropriate units
Describe the preparation of 1.5 liters of a 0.1 M acetate buffer, pH 5.0, starting from solid sodium acetate trihydrate
A 2.914-g sample of gypsum, a hydrated salt of calcium sulfate, CaSO4, is heated at a temperature greater than 170 Celsius in a crucible until a constant mass is reached.
The reaction of coal with water at high temperatures produces synthesis gas, which is a mixture of carbon monoxide and hydrogen. Use the bond energies in the table below to estimate the enthalpy of the reaction C(g) + H2O(g) ? CO(g) + H2(g) Energy..
a reaction that contributes to the depletion of ozone in the stratosphere is the direct reaction O(g)+O3(g)-->2O2(g) at 298K the rate constant is 4.8*10^5M-1s-1 use delta H values from appendix C to estimate
You are given a worked wooden item from an archaeological dig believed to date to during the last glaciation. As such, the artifact would be another piece of evidence.
Explain the following trends in lattice energy. (Select all that apply.) (a) NaCl > RbBr > CsBr CsBr is smaller than RbBr and NaCl. NaCl is smaller than RbBr and CsBr
Group A used 500 moles of styrene and 0.1 moles of benzoyl peroxide while Group B used the same amount of benzoyl peroxide as Group A but used less styrene,150 moles. What would the average molecular weight of each group's polymer sample be?
Zinc citrate (Zn_3(C_6H_5O_7)_2) is an ingredient in toothpaste. It is synthesized by the reaction of zinc carbonate with citric acid. 3ZnCO_3(s) + 2C_6H_8O_7(aq) ---> Zn_3(C_6H_8O_7)_2(aq) + 3H_2O(l) + 3CO_2(g).
Gold sells for $1120/oz. One ounce is equal to 28.35g. The molar mass of gold is 196.97g/mol. 1 moldovian franc contains 0.567g of gold. If 1 franc = $1.42, how many atoms of gold are presents in 0.010 moldovian francs?
The density of a particular solid is 5.81 g/cm3 at 25°C. What is its density in kilograms per cubic meter (kg/m3)
At 400°K , 0.20 M NO and 0.10 M Cl2 were mixed. The reaction rate was found to be 3.04 ? 10-6 M/s. What is the value of the rate constant, k?
What is the pH of a 1.2M solution of sodium nitrite, NaNO2? the Ka for nitrous acid (HNO2) is 4.5x10^-4be as specific as possible and list all the steps
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