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? Can be more than one answer.

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.