Carbon compounds have long been associated as insulators but now we have carbon based materials (small molecules and polymers) widely being used in mobile phones and tv screens as oleds. what makes organic molecules work as semiconductors? alternation of single bonds between two carbon atoms. alternation of single and double bond between two carbon atoms. alternation of single and triple bond between two carbon atoms. none of these.

Alternation of single and double bond between two carbon atoms.

Explanation:

What makes the organic compounds act as semiconductors are the pi-bonded molecules, pi-bonds are double bonds that are delocalized and therefore can be single or double bonds along the molecule. So the correct answer is Alternation of single and double bond between two carbon atoms.

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