Solution A Solution B Particle Size of Salt large clumps tiny grains
Temperature of Solvent cold water hot water
Level of Agitation slow stirring fast stirring

What conclusion can be drawn from these solutions?

A.
Solution A will take less time to dissolve, because gently stirring will allow it to combine more evenly.

B.
Solution B will take longer to dissolve and might have some undissolved salt remaining at the bottom of the solution due to the high temperature.

C.
Solution B will take less time to dissolve, because hot water will cause some of the salt to evaporate.

D.
Solution A will take longer to dissolve and might have some undissolved salt remaining at the bottom of the solution due to the low temperature.

here is table 2-2:

country

percent of eligible voters that voted

rank

united states

44.9%

138

canada

60.1%

107

costa rica

84.6%

14

hungary

66.9%

82

japan

57.0%

118

egypt

27.7%

159

south africa

85.5%

10

ans is no, the data set cannot be plotted as a single circle graph

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