Chemistry, 14.09.2021 17:40 emfastback8868
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In a science class, students are challenged to create heat through a chemical reaction. The challenge is to melt an ice cube as quickly as possible. A
student decides to dissolve calcium chloride (salt) in water. When calcium chloride is dissolved in water, it creates an exothermic reaction. The student
places the calcium chloride and water in a plastic bag and then places the ice cube on top of the bag.
Which of these would increase the heat generated and reduce the time it takes the ice cube to melt?
Increasing the size of the ice cube to be melted.
Increasing the amount of calcium chloride placed in the bag.
Increasing the size of the plastic bag.
Dropping the ice cube in the bag with the calcium chloride and water and then shaking the bag.
Putting more water and less calcium chloride in the bag.
Doubling the size of the plastic bag and doubling the amount of water and calcium chloride used,
Nature of Science
Answers: 3
Chemistry, 22.06.2019 00:00, lilyclairehutson
Which of the following statements is true? a. elements in the last period are radioactive. b. atomic weight is the same as atomic mass. c. elements in the same group have the same number of electron shells. d. atomic number equals the number of neutrons in the nucleus of an atom.
Answers: 1
Chemistry, 22.06.2019 17:00, calmicaela12s
Which statement is true about a catalyst? a: a catalyst decreases the rate of the reaction. b. a catalyst is consumed during a chemical reaction. c. a catalyst lowers the activation energy of a reaction. d. a catalyst increases the reactant concentration during a reaction.
Answers: 1
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