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How does plaque harm teeth? Explain in detail? How does fluoride promote dental health?
an isolated quantity of an ideal gas at 294.2 k has a volume of 20.46 l at a pressure of 1.18 atm. what is the pressure
Consider the following bond lengths: C-O is 143pm, C=O is 123 pm, and C triple bond O is 109 pm. In the [ CO3 ]2- ion, all three C-O bonds have identical bond lengths
A 14.0 g sample of X combines with a 26.2 g sample of Y to form the compound XY2. What is the mass of the reactants.
Define the key points of the relationship of thermodynamics as well as kinetics in relation to chemical reactions that takes place in the atmosphere
a certain first-order reaction has a rate constant of 8.80times10-3. how long will it take for the reactant
If you mixed 75 ml of 2 M HCl with 37.5 ml of 4 M NaOH, how many joules of heat would be released? How much would the temperature of the solution increase?
what is the expected boiling point of a brine solution containing 30.00g of KBr dissolved in 100.0g of water?
Why are fluorescence measurements made at 90 degrees from the incident beam in most cases? 3. What is the ideal cuvette placement to avoid pre- and post-filter effects?
Using the same sample of gas ( = 275 , = 43 ), we wish to change the pressure to 2750 with no accompanying change in volume or amount of gas.
This is maintained by a number of buffers, such as the carbonic acid/bicarbonate system. Write out the acid-base reaction and state qualitatively how this buffer solution resists changes in pH. Given the Ka of carbonic acid, H2CO3 is 4.5 x 10-7.
If a wavelength is chosen at which the Cr(H2O)3+ absorbs and the CrEDTA- does not absorb, would you need to boil the solutions
While the two solutions are mixed in a constant-pressure calorimeter, a precipitate forms also the temperature of the mixture rises from 21.5 C to 27.7 C. Prior to mixing, how many grams of Cu are present in the solution of CuSO4
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