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It is often possible to change a hydrate into an anhydrous compound by heating it to drive off the water (dehydration).A 49.38 gram sample of a hydrate of BaI2 was heated thoroughly in a porcelain crucible, until its weight remained constant. After heating, 45.22 grams of the anhydrous compound remained. What is the formula of the hydrate?
A particular radioactive isotope has a half-life of 20.8 days. If you have 32.5 mg of the isotope at the beginning of the week, how many milligrams would you have 40 days later?
A first order reaction has a half-life of 1.34 x 10^-3 hours. If the initial concentration of the reactant is 8.00M, what is its concentration after 4 half-lives?
An increase in the temperature of the reactants causes an increase in the rate of reaction. The best explanation for this behavior is that as the temperature increases
a 12.6 g sample of nh4no3 is dropped into a constant-pressure calorimeter containing 175 g of water at 23.5 c. what
The half life of a first order reaction is 13 min. If the initial concentration of reactant is 0.085 M, what is its concentration after 8.2 minutes.
Suppose that a hotplate transfers 325KJ of energy to 450g of liquid water at 20C. What mass of the water would be boiled away
Consider a hydrogen atom in the ground state. What is the energy of its electron? b. Consider a hydrogen atom in an excited state of
Calculate the activation energy of a reaction whose rate constant is 4.22 x 10?4 s?¹ at 25°C and 4.54 x 10?4s?¹ at 45°C.
When square brackets are placed around the formula for a substance, such as [NaOH], it indicates that we are working with the percent-by-mass
Explain this theary and how the shapes of simple molecules and polyatomic ions can be worked out using it. you will need to illustrate your account with a number of diagrams, in particular showing the difference typical shapes of simple molecules ..
Galvanized nails are iron nails that have been plated with zinc to prevent rusting. The relevant reaction is Zn2+(aq)+2e- -> Zn(s) For a large batch of nails, a manufacturer needs to plate a total zinc mass of 1.60 kg on the surface to get adequat..
Human and chameleon insulins have the same amino acid sequence, with the exception of six amino acids, as shown below. Is the pI of human insulin lower, higher, or the same as that of chameleon insulin?
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