Atems are made of protons neutrons and electrons. Read the characteristics of these subatomic particles below. Decide whether each characteristic describes protons, neutrons or electrons. Then write each characteristic in the correct section of the Venn diagram below.
Characteristics of Subatomic Particles
Are negatively chargest
Have the smallest mass of the subatomie particles
• When these are equal, the atomis neutral
• Are located in orbitals surrounding the nucleus
Are positively chargest
• Are located in the nucleus
Are subatomic particles
Were discovered by Thomson
• Make up the mass of the atom
. Do not have a charge
QA
BI

the atomic mass is the bottom number on the element.

-steel jelly

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