Which reaction is an example of natural transmutation?
(1) 239/94 Pu ->235/92 U + 4/2 He
(2) 27/13 Al + 2/4 He ->30/15 P + 1/0 n
(3) 238/92 U + 1/0 n → 239/94 Pu +2 0/-1e
(4) 239/94 Pu 1/0 n → 147/56 Ba + 147 56Sr + 3 1/0 N

dishwashers don't have rights

explanation:

dishwashers are meant for one thing and one thing only: dishwashing. they belong in the kitchen making sandwiches and cleaning up for the man of their household. if your dishwasher starts acting up just slap it and wait a minute.

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.

answer : third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol

explanation :

let us write down the given equations

equation 1 :

equation 2 :

equation 3 :

let us use hess's law to find out which 2 equations can be added to get the third equation.

let us reverse equation 2 and multiply it by 2. the new equation that we get is,

equation 4 :

let us add equation 1 & 4

the above equation is similar to equation 3 but has different value for dhrxn.

therefore third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol