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Radiocarbon dating of plants and animals.
How many years will it take for carbon-14 to diminish to 1% of the original amount after the death of a plant or animal? Use the formula A=A0e(-0.000124t). Compute the answer to three significant digits.
Why is the freezing point of water set at 32ºF? Why does the Fahrenheit scale start at 0º?
1. If you wish a buffer to have a pH of 10.00, what is the desired [H 3 O + ]? 2. In the buffer from 6, you want to select a weak acid (one of the conjugate pair) with a Ka close to that value of [H 3 O + ]. Explain why, ...
1. Reacting molecules or ions in a solution at room temperature are in constant motion and collide. Some collisions lead to formation of product and some don't. what determines a reaction will take place. 2. Is there any ...
Assuming that air is 21.0 percent oxygen by volume, what volume of air in liters at 45.0 °C and 793 mmHg would be required to burn 185 g of ethanol (C 2 H 5 OH)?
The volume of a sample of nitrogen is 6.00 liters at 35oC and 740 torr. What volume will it occupy at STP?
A sample of O2 was collected over water at 25C and .865 atm. If the total sample volume was 2.538 L, how many moles of O2 were collected?
Using the Debye-Hucket equation, calculate the activity coefficients for the acidic and basic forms of bromocresol green, HX- and X2-, for a solution with an ionic strength of u=0.1M.
When 1.00 moles of HI(g) is sealed in 1.00L flask at 225 degrees Celcius, it decomposes until the equilibrium amount of I2(g) is 0.182 moles. Calculate Keq using this information. The decomposition reaction is HI(g)=I2(g ...
1.) What is the purpose of making derivatives of unknowns? 2.) Give three reasons why acetone might interfere with your results. 3.) An unknown sample does not react with 2,4-dinitrophenylhydrazine reagent, but a color c ...
Analyzed individually, two solutes have retention times of 17 s and 21 s with peak widths at half-maximum (w1/2) of 1.9 s and 2.8 s, respectively. If the two solutes are analyzed together, what would be the resolution on ...
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