To determine which option will speed up the reaction between a baking soda solution and a calcium chloride solution, we should consider factors that typically increase the reaction rate: temperature, surface area, and concentration.
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a. Keep the beaker in a freezer. - This would lower the temperature and likely slow down the reaction.
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b. Keep the beaker in sunlight. - This could increase the temperature, which may speed up the reaction.
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c. Pour the solutions into a flat dish. - This would increase the surface area of the solutions in contact with each other, which can promote a faster reaction.
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d. Pour the solutions into a narrow test tube. - This would decrease the surface area of the reaction, which may hinder the speed of the reaction.
Considering these points, the best options to speed up the reaction are b (keeping the beaker in sunlight to increase temperature) and c (pouring the solutions into a flat dish to increase surface area). However, c is generally the most effective option for promoting faster mixing and reaction due to increased surface area.
The best choice is: c. Pour the solutions into a flat dish.