What is an alpha particle? a particle consisting of a positively charged electron a particle consisting of one proton and two neutrons a particle consisting of two protons and two electrons a particle consisting of two protons and two neutrons

D. A particle consisting of two protons and two neutrons

Explanation:

I took the test and got it correct also hi everyone from FLVS!

the right answer is c i just did the question.

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