Question

What affect will adding sugar have on the viscosity of water?
What affect will adding salt to water have on the repulsion from a magnet?
How does adding salt affect the freezing point of water?
How does temperature change affect water's cohesion?
How does temperature change affect surface tension?

Answer 1

1. The viscosity of a fluid is a measure of its resistance to gradual deformation by shear stress or tensile stress. For liquids, it corresponds to the informal notion of "thickness". A more viscous fluid likely has stronger intermolecular forces, and adding sugar increases the intermolecular forces, raising water's viscosity.

Answer 2

2. When the salt dissolves, the ions of the salt will increase the charge of the water, therefore causing the magnet to have a greater repulsion. (not quite sure of this one)
3. Salts in water will lower the freezing point of water. At the molecular level, the molecules are onstantly vibrating, moving, and bouncing around. As the temperature of water is decreased the water molecule's bouncing, vibrations and movements begin to slow down. The freezing point is the point when all of the bouncing and moving slows down enough to allow the molecules to stick together (like magnets) and form crystals (ice). When ice has formed the moving and bouncing of water molecules has completely stopped. Salt in the water disrupts the crystallization process. Salt dissolves into sodium and chloride ions. Those ions partially block the water molecules from bonding to each other.