Students are making solutions by dissolving potassium chloride into water. There is 100 mL of water at 60°C in each beaker. The students dissolve different amounts of
potassium chloride in each beaker. The models below each represent the beakers
with water and different amounts of KCL

Which of the following statements about the models is true? (Select Two)
A. The solution in beaker A has the greatest concentration
B. The solution in beaker B has the greatest concentration
C. The solution in beaker C has the greatest concentration
D. The solution in Beaker A has the highest conductivity.
E. The solution in Beaker B has the highest conductivity.
F. The solution in Beaker C has the highest conductivity

why is arctic sea ice important? arctic sea ice keeps the polar regions cool and moderate global climate. sea ice has a bright surface; 80 percent of the sunlight that strikes it is reflected back into space. as sea ice melts in the summer, it exposes the dark ocean surface.

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.