A student is investigating the transfer of energy between potential and kinetic. The student observes a roller coaster at four l
ocations on the track and creates a graph based on her observations.
What conclusion can be made based on the graph?
A.Kinetic and potential energy change, but total energy stays the same.
B.Potential energy is increased, but kinetic energy stays the same.
C.Kinetic energy is created during a roller coaster ride.
D.Potential energy is destroyed during a roller coaster ride.
What conclusion can be made based on the graph?
A.Kinetic and potential energy change, but total energy stays the same.
B.Potential energy is increased, but kinetic energy stays the same.
C.Kinetic energy is created during a roller coaster ride.
D.Potential energy is destroyed during a roller coaster ride.
2 answers:
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Answer : Both solutions contain molecules.
Explanation : The number of molecules of 0.5 M of sucrose is equal to the number of molecules in 0.5 M of glucose. Both solutions contain molecules.
Avogadro's Number is =
which represents particles per mole and particles may be typically molecules, atoms, ions, electrons, etc.
Here, only molarity values are given; where molarity is a measurement of concentration in terms of moles of the solute per liter of solvent.
Since each substance has the same concentration, 0.5 M, each will have the same number of molecules present per liter of solution.
Addition of molar mass for individual substance is not needed. As if both are considered in 1 Liter they would have same moles which is 0.5.
We can calculate the number of molecules for each;
Number of molecules = ;
∴ Number of molecules = which will be =
Thus, these solutions compare to each other in that they have not only the same concentration, but they will have the same number of solvated sugar molecules. But the mass of glucose dissolved will be less than the mass of sucrose.