Complete the following chart using your class notes. Use the virtual simulator. Hot Pack/Cold Pack Simulator. Compound

Beginning Temp.

End Temp.

Change in Temp. (End temp. - Beg. Temp.)

(If the temp. decreased, be sure to put a negative sign (-) in front of the number. If the temp. increased, be sure to put a positive sign (+) in front of the number.)

Sodium Chloride

21° C

° C

° C

Lithium Chloride

21° C

° C

° C

Sodium Hydroxide

21° C

° C

° C

Potassium Chloride

21° C

° C

° C

i'm wiling to try and you : )

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

on passing the small ampere of electric current through the tube made of ar and hg of cfl generates uv rays which excites the fluorescent and thus emits the high radiation by consumption of just 5- 12 w in comparison to incandescent light which requires more power such as around 40 - 55 w to lighten.

moreover the life span of fluorescent or cfl is around 8000 h whereas the life span of incandescent is around 1200 h

hence, the building installed with incandescent lights bears more electricity bill.