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Natural selection occurs and doesn't result in evolution when a phenotypic trait is variable but it is not heritable therefore it won't result in a chnage in the trait's value over time. What are some examples of this? And are there any other ways natural selection occurs in the absence of evolution that I may be missing??
Determine the concentrations (in M) of acetic acid and sodium acetate in 0.2 M 'acetate' buffer, pH 6.0. The pKa for acetic acid is 4.76.
You have a sample of bone collected from Nevada and you find that it contains strontium-90 and exhibits an activity of 2.5 Bq. How much strontium-90 was present in the bone when the animal died 45 years ago?(The half-life of 90Sr is 29 years.)
A compound contains only carbon, hydrogen and oxygen. Combustion of 7.30 mg of the compound yields 10.68 mg of carbon dioxide and 4.37 mg of water. What is the empirical formula of this compound
Change in heat content We write H = Hfinal - Hinitial or for chemical reactions H = Hproducts - Hreactants Given this equation, What sign is H for exothermic reactions? What sign is H for endothermic reactions?
Explain a piece of metal having a mass of 26.47 g at 89.98 C was placed in a constant-pressure calorimeter of negligible capacity containing 100.0mL of water. Explain the water temperature rose from 22.50 C to 23.17 C.
What will happen to the number of moles of SO3 in equilibrium with SO2 and O2 in the reaction 2SO3(g) 2SO2(g) + O2(g)
How many milliliters of 0.20M NaOH do you need to neutralize 40.0 ml of 0.12M acetic acid?
How many molecules of ethanol C2H5OH are present in 135 g of ethanol? The density of ethanol is 0.789 g/cm3?
Question- Give the chemical formula for trans-dichlorobis (ethylenediamine) platinum (lV). Use (en) as the symbol for ethylenediamine.
What is the enthalpy of this reaction. Assume that no heat is lost to the surroundings or to the coffee cup itself and that the specific heat of the solution is the same as that of pure water.
If a current of 40 mu A (40x10-6A) is drawn from a solar cell for 6 months, how many faradays are involved
The solubility of salicylic acid in diethyl ether is 1 g/3 mL at 25 °C. Is diethyl ether an appropriate solvent to use for recrystallizing salicylic acid? Explain
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