For parts of the free-response question that require calculations, clearly show the method used and the steps involved in arriving at your answers. You must show your work to receive credit for your answer. Examples and equations may be included in your answers where appropriate. A student added a sample of NH4NO3(s) to water and measured the temperature over time. The data are shown in the graph above. (a)WhatisthevalueofΔTthatthestudentshouldusetocalculateq?b) According to the graph, is the dissolution of N H4NO3(s) endothermic or exothermic? Explain. c)Are the strengths of the interactions between the particles in the solute and between the particles in the solvent before the solute and solvent are combined greater than, less than, or equal to the strengths of the interactions between solute particles and solvent particles after dissolution? Explain.
For parts of the free-response question that require calculations, clearly show the method used and the steps involved in arriving at your answers. You must show your work to receive credit for your answer. Examples and equations may be included in your answers where appropriate.
A student added a sample of NH4NO3(s) to water and measured the temperature over time. The data are shown in the graph above.
(a)WhatisthevalueofΔTthatthestudentshouldusetocalculateq?b) According to the graph, is the dissolution of N H4NO3(s) endothermic or exothermic? Explain.
c)Are the strengths of the interactions between the particles in the solute and between the particles in the solvent before the solute and solvent are combined greater than, less than, or equal to the strengths of the interactions between solute particles and solvent particles after dissolution? Explain.
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