List 50 Laboratory Apparatus used in
CHEMISTRY

1: safety goggles

2: beakers

3: test tubes

4: tongs

5: racks 6: watch glasses

7: crucible

8: funnels

9: graduated cylinder

10: volumetric flask

11: droppers 12: pipette

13: ring stand

14: rings

15: clamps

16: tongs

17: forceps

18: spatulas scoopulas

19: thermometer

20: Bunsen burner

21: balance

22: Florence flask

23: conical flask

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

the correct answer would be b. amelia, because the particals of gas move really fast (charged particals) and gas also has a lot of room (particals move independently) so the only answer that has both of those is amelia's.