Gizmo Warm-up A chemical change, (or chemical reaction) occurs when one or more substances,
called reactants are n see, touch, or smell.
To begin, check that Reactant 1 is Sodium and Reactant 2 is Water. Sodium is a
metal so soft you can cut it with a knife.
1. Click Play ( ). What do you observe?

2. Do you think a chemical reaction has taken place? Explain.
A chemical reaction has

Idon't know hope someone you

Vander waals forces are inter molecular bonds that exist within molecules of the same substance. a water molecule is made up of oxygen and hydrogen atoms which share electrons between each other. the vander waals forces are forces that exist between multitude of different  molecules of water. dipole dipole forces is the type of vander waals force that exist in water. the oxygen atom which is more electronegative pulls the shared electron closer to itself thus generating a partial negative charge while the hydrogen acquire a partial positive charge. these two different charges causes attraction to occur in water molecules.