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How do epidemiologists distinguish between correlation and causation? Discuss the elements of Hill's criteria, and provide an example of how correlation can be confused with causation.
How many grams of dry NH4Cl need to be added to 2.00 L of a 0.600 M solution of ammonia, NH3, to prepare a buffer solution that has a pH of 8.89. Kb for ammonia is 1.8 X10^-5.
For a particular reaction, deltaH is -93.8kJ and deltaS is -156.1 J/K. Assuming these values change very little with temperature, over what temperature range is the reaction spontaneous in the forward direction?
How much time (in s) is needed for NOCl originally at a concentration of 0.0194 M to decay to 0.0026 M
Perform a series of experiments for the reaction A?B+C and find that the rate law has the form rate = k[A]x. Determine the value of x in each of the following cases.
Examine the label of any vegetable oils, solid shortening, margarine, or butter you might have on hand. Identify the oil or fat and report the level of saturated, mono-unsaturated
If a pure R isomer has a specific rotation of -133.0°, and a sample contains 64.0% of the R isomer and 36.0% of its enantiomer, what is the observed specific rotation of the mixture
Explain the difference between oxidative phosphorylation and substrate-level phosphorylation occurring in glycolysis and the citric acid cycle
A pressure of 0.49 atm of NO2 is introduced into a container and allowed to come to equilibrium. Explain what are the equilibrium partial pressures of NO(g) and O2(g)
What mass of this substance must evaporate in order to freeze 150g of water initially at 15C? (The heat of fusion of water is 334J/g the specific heat of water is 4.18J/g*K.)
The pressure of a sample of gas at 10.0 C increases from 700. mm Hg to 900. mm Hg. What is the new temperature?
Equal quantities of 0.010M solutions of an acid HA and a base B are mixed. The pH of the resulting solution is 9.4. A) If Ka for HA is 9.0×10?5, what is the value of the equilibrium constant for the reaction between HA and B
placed in 1.00*10^3 g of water at 25C. final temp of this mixture was 26.3C. What is specific heat of metal?
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