Marika wants to collect a precipitate of Ca(OH)2. So she makes a 0.01 M solution of NaOH and mixes it with a 0.05 M solution of Ca(NO3)2. She finds
that the reaction is very slow. What would be the best way to increase the rate
of the reaction?
A. She could make the original solutions at lower concentrations.
B. She could use less of each solution.
C. She could make the original solutions at higher concentrations.
O D. She could reduce the temperature of the solutions.

How does the digestive system interact with the circulatory system? a. messages sent as electrical impulses from the digestive system are transported throughout the body by the circulatory system. b. nutrients taken in and broken down by the digestive system are carried to various parts of the body by the circulatory system. c. nutrients and gases are absorbed by organs in the circulatory system. then, they are transported to all parts of the body by organs in the digestive system. d. oxygen and carbon dioxide are exchanged by organs in the digestive system, and the gases are carried to the rest of the body by the circulatory system.