Cesium : [Xe]6s1 [ X e ] 6 s 1 . It loses 1 electron from 6s orbital and attains the noble gas configuration of Xenon.
Answer:wqqqqqqqqqqqqqqgqr
wr
Explanation:
qbqg4
Answer and Explanation:
Aspirin is odorless, but when left exposed to air in the environment, it gradually hydrolyzes into salicylic acid and acetic acid as that is the precursor for synthesizing Aspirin.
Using this hydrolyzed aspirin for titration would not be advised, because it would affect the reading of the titration. Ordinarily, apsirin is a weak acid and direct titration of aspirin is problematic because it hydrolyzes pretty fast to salicylic acid— leading to an unwanted side reaction which may or may not go to completion. Therefore, excess base must be added and heat is supplied to the mixture so that neutralization and hydrolysis are complete. The remaining base is then titrated. This is called back titration.
Now, in back titration, instead of using solution whose concentration is expected to be known, we rather use excess volume of reactant which has been left over after the completion of a reaction with the analyte.
In this case, we use an alkali, preferably NaOH (1.0 mol/dm³). Te unused NaOH remaining after the hydrolysis is titrated against a standard HCl (0.1 mol/dm³). Then from the reaction equation of the aspirin and sodium hydroxide, the amount of NaOH required for the hydrolysis can be calculated.
Answering whether the titration goes up or down, it would be observed that the titration reading would GO DOWN because the exposed aspirin used has experienced some form of hydrolysis before it was used for titration, so the hydrolysis reaction it would undergo with acetyl-salicylic acid would be minimal, and this would affect the titration reading.
But if the aspirin wasn't left exposed to the environment, the reading would go up since more hydrolysis would take place in this case.
Answer:
The functional group is called an amide. This is option C.
Explanation:
We see this is a three-carbon chain (a propyl chain), that ends with a double bond to oxygen and a single bond to an amine group (NH2). If the end carbon were only bound to the NH2 group and 2 hydrogen atoms, it would be an amine. If the end carbon only had a double bond to oxygen and a single bond to hydrogen, it would be an aldehyde. However, when a terminal carbon (a carbon at the end of a chain) has both a double bond to oxygen, and a single bond to an amine (NH2), it is called an amide.
We can also discount the answer thiol right away because those have a carbon-sulfur bond, and there is no sulfur in this molecule.
Answer:
physcial change
Explanation:
As it has visible changes on shape and size
