Which intermoleculer force would affect melting point the least?
a: hydrogen bonding
b: dipole-dipole interactions
c: van der waals forces
d: ionic bonding

they begin to vibrate harder causing the material that was solid to turn into a liquid i.e gallium or ice

the correct option is c.

isotopes refers to different forms of the same element with the same atomic number but different mass number as a result of difference in their neutron numbers. isotopes have different relative atomic mass but share the same chemical properties.

"record the time to complete a chemical reaction" would most likely be part of a lab procedure.