20. 6th-grade question NEED HELP PLEASE
Which statement best describes the relationship between visible light and the electromagnetic spectrum?

A. Visible light and the electromagnetic spectrum are different names for the same phenomenon.
B. Visible light occupies about half of the electromagnetic spectrum.
C. Visible light is a narrow band in the electromagnetic spectrum.
D. Visible light and the electromagnetic spectrum have a small area of overlap.

D. visible light and the electromagnetic spectrum

have a small area of overlap.

Explanation:

you have to look careful in answering questions you could end up right or wrong, on these answers are very important to know, and I am always right with these answer's

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