Help Please . Aisha drops an antacid tablet in water and times how long it takes to dissolve. Which of the following will decrease the reaction rate?
A.increasing water temperature
B.decreasing water temperature
C.using more water
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Using more water
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To determine which factor will decrease the reaction rate of dissolving an antacid tablet in water, we need to understand the concept of reaction rates.
The reaction rate is the speed at which a chemical reaction takes place. It can be affected by various factors. In this case, we need to consider the factors that are related to the reaction between the antacid tablet and water.
Option A: Increasing water temperature
Increasing the water temperature generally speeds up most chemical reactions because it provides more energy, increasing the rate at which the particles collide. Therefore, increasing the water temperature would actually increase the reaction rate.
Option B: Decreasing water temperature
On the other hand, decreasing the water temperature slows down most chemical reactions. Lower temperatures result in a decrease in the kinetic energy of the particles, reducing the rate at which they collide. Thus, decreasing the water temperature would decrease the reaction rate.
Option C: Using more water
Using more water does not have a direct impact on the reaction rate. Increasing the amount of water may dilute the concentration of the antacid tablet but it doesn't directly affect the speed of the reaction. Therefore, using more water has negligible effects on the reaction rate.
Based on the explanations above, the correct answer is B. Decreasing water temperature will decrease the reaction rate.