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Why does finding a straight line relationship help you to understand the nature of the relationship between transmittance and concentration?
The last step in the uranium decay series is Po-210 going to Pb-206 plus the emission of an alpha particle. Listed are the masses of the involved items: Po-210: 209.9829 AMU Pb-206: 205.9745 AMU alp
The half life of oxygen-19 is only 29 seconds. Lets say we somehow instantly make a Liter of O-19 in a reactor. So at t = 0 we have 1 Liter of this isotope. What fraction of the O-19 isotope would b
The atomic mass of Potassium 39 is 38.96371 AMU. Calculate the binding energy for a mass of this nuclide using 1.008665 AMU for the mass of the neutron, 1.007276 AMU for the mass of the proton, 0.00
Carbon-14 decays by beta emission with a half life of 5,730 years. Assuming a particular object originally contained 6.5 micro grams of C-14 and now contains 0.76 micro grams of C-14, how old is the
The number of nuclei decaying in a sample of Gallium-68 decreased by a factor of 4 over a period of 136.6 minutes. What is the half life of this isotope
The rate of reaction is 1.6 X 10-8 mol/L.min when the nitrogen oxide concentration is 0.020 M and the bromine concentration is 0.030 M. What is the value of K
what is the equilibrium pressure of hydrogen sulfide if the equilibrium pressure of hydrogen is 0.103 atm and the equilibrium pressure of sulfur is 0.417 atm?
The electron in the He+ ion is excited to the n = 2 principal state. What is the energy of the electron now
The electron in the He+ ion is excited to the n = 2 principal state. What is the energy of the electron now?
Dehydration of two alcohols leads to preparation of methylcyclohexene. write chemical equations for both reactions.
how many millgrams of ascorbic acid (molar mass = 176.1g/mol) are in the sample, calculate the number of milligrams of ascorbic acid per 100g of citrus juice.
Equal volumes of cold 4.184M NaOH at 20C and warm 4.184M HCl at 77.3C are mixed together in a highly efficient calorimeter. what is the final temperature of the solution
This strontium isotope is radioactive, with a half-life of 28.1 yr. Calculate how long it will take for 0.890 g of the isotope to be reduced to 0.250 g by decay.
Write net Brønsted equations that show the acidic or basic nature of the following solutions in water. For polyprotic species (vitamin C, lemon juice, and washing soda), show only one proton
If 2.5 mol of ethylene oxide is decomposed at 93 degrees celcius what will be the final temperature of the products? The heat capacity of the products is 110.13J/mol C?
In oxidation of benzoin to benzil with nitric acid, why it is important to avoid heating the mixture above 70 °C? What is the possible side product if this happens
A 2.0 mole sample of the compound K2[Pt(CN)4] is dissolved in water. How many total moles of ions will the solution contain?
Consider a Hydrogen atom with the electron in the n = 6 shell. What is the energy of this system? (The magnitude of the ground state energy of the Hydrogen atom is 13.6 eV.)
Some plants require acidic soils for healthy growth. Which would be more productive to add to the soil in order to make it more acidic, Fe2(SO4)3 or Na2SO4, and why
What concentration of chloroacetic acid, ClCH2COOH, should be added to a 0.010 M ClCH2COONa solution to prepare a buffer of pH 4.00? Ka = 1.4 X 10-3
A buffer solution of pH 5.3 is to be prepared from propionic acid and sodium propionate. The concentration of sodium propionate must be 0.50 M. What should the concentration of propionic acid be? Ka
Phenol is a weak acid that is sometimes used as a disinfectant. Calculate the pH of a solution of 0.0100 M phenol. Ka for phenol is 1.3 X 10-10.
An atom is ionized so that it has only one electron. When the electron drops from the n = 4 shell to the n = 1 shell, an X-ray of wavelength 101.20 pm is emitted. What is the atomic number?
In the ground state of the Hydrogen atom the energy of the electron is E0 = -13.61 eV. What is the energy of the electron in the ground state of the He+ ion