Two identical spring scales are arranged as shown. If a weight is suspended as shown in the figure, what will happen? 

A. Spring on the left will stretch more.

B. Spring on the right will stretch more.

C. Both springs will stretch the same distance.

D. One cannot tell which spring will stretch more

the energy to form plasma comes from heat or electricity in the atmosphere!

sunny~ ☺

one negative thing it that it can kill water animals. another negative thing is it can cause the destruction of ecosystem. one way water pollution can be reduced is to conserve energy.

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