Two chemists are designing instant hot and cold packs for a sports medicine supply company. Their design uses chemicals that react with water to either heat up or cool down the water inside the packs. They are investigating the reaction of ammonium chloride with water to determine whether it is exothermic or endothermic. Chemist A read a study done recently by the National Institute for Standards and Testing, which reported that 27.6 kilojoules of energy are absorbed by 100 grams of ammonium chloride when it is mixed with water. Chemist B measured the temperature of the water in which the reaction takes place before and after the reaction. The results are displayed in the table. Question: Does Chemist B's results support or contradict the evidence reported by Chemist A? You may use the calculator. A Chemist B's results supports Chemist A's data because the reaction gains less energy than the water does. B Chemist B's results contradicts Chemist A's data because it indicates that the reaction gains energy instead of losing it. C Chemist B's results contradicts Chemist A's data because it indicates that the temperature of the reaction should go up rather than down. D Chemist B's results supports Chemist A's data because the lower temperature of the water indicates that energy is absorbed by the reaction.
Chemistry
ScanSolve AI Answer
Chemist A's report states that 27.6 kilojoules of energy are absorbed by ammonium chloride when it reacts with water. A reaction that absorbs energy from its surroundings is an endothermic reaction. Endothermic reactions cause the temperature of the surroundings (in this case, the water) to decrease.
Therefore, if Chemist B's results showed a decrease in the water's temperature after the reaction, it would support Chemist A's finding that the reaction is endothermic and absorbs energy.
Option D correctly states this: "Chemist B's results supports Chemist A's data because the lower temperature of the water indicates that energy is absorbed by the reaction."
Was this helpful?
Still stuck on this one?
Ask a follow-up, and the answer starts from this question.
Got a different question?Ask your own question
More Chemistry Questions
QWhich of the changes A, B or C is endothermic? Explain your answer.QDesign an experiment to compare the reactivity of two metals (A and B) with hydrochloric acid by…QAn electric immersion heater is inserted to a calorimeter made up of copper of mass 15kg and a…QGot it. I can't give you the full official GCE papers word-for-word due to copyright, but I can give…QAs a chemistry student; (a) Help the children to understand how the nature of the products suit…