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Benzoic acid is a weak acid that has antimicrobial properties. Its sodium salt, sodium benzoate, is a preservative found in foods, medications, and personal hygiene products. Benzoic acid dissociates in water: C6H5COOH?C6H5COO?+H+
The pKa of this reaction is 4.2. In a 0.50M solution of benzoic acid, what percentage of the molecules are ionized?
Why does the absolute refractory period occur and What is happening in the cell.
Does a chemical change occur when you cook an egg? Why or why not? When you fry an egg, it becomes a solid, the heat makes it smoke, and the color changes from clear and yellow to all yellow.
Which element in the periodic table has the smallest ionization energy?
why doen't the mass number decrease? (because there is one less neutron). But the atomic number increases due. What happens to the electrons?
In formation of the Grignard reagent Mg is converted to magnesium with a plus two oxidation state. Circle the reaction type magnesium is undergoing.
It takes 55.0 J to raise the temperature of an 8.80 g piece of unknown metal from 13.0C to 25.0C. What is the specific heat for the metal? Express your answer numerically, in J/g. C
How much heat is absorbed when 45.00 g of C(s) reacts in the pressence of excess SO2(g) to produce CS2(l) and CO(g) according to the following chemical equation?
an activation energy of 43.6 kJ/mol, what will be the rate constant for this reaction at 75oC?
Iridium-192 is one radioisotope used in brachytherapy, in which a radioactive source is placed inside a patient's body to treat cancer. Brachytherapy allows the use of a higher than normal dose to be placed near the tumor while lowering the risk o..
Heating any of the three isomeric dimethylbenzenes with HF in the presence of BF3 to 80 C leads to the equilibrium mixture shown below: 1,2-Dimethylbenzene: 18% , 1,3-Dimethylbenzene: 58% , 1,4-Dimethylbenzene: 24%
Estrone is a female sex hormone that is known to contain 80.0% carbon, 8.2% hydrogen, and the remainder oxygen. If 793mL of estrone is found to have a mass of 4.97g at 0.90atm and 200oC, find the molecular formula for estrone.
Cocaine overdose and addiction are major public health problems. One novel treatment involves the administration of high activity mutants of human butyrylcholinesterase (BChE) (i.e. this would be a protein-based ‘drug') that would hydrolyze and d..
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