Covalent bonding occurs when pairs of electrons are shared by atoms.
This occurs when the internal energy of the solid increases, typically by the application of heat or pressure, which increases the substance's temperature to the melting point. At the melting point, the ordering of ions or molecules in the solid breaks down to a less ordered state, and the solid melts to become a liquid.
The answer is D. 2:1 since the input force is half the output force that corresponds to a 2:1 ratio of input to output.
Highway: has intersection and expressway don't
Expressway: Don't have intersection and it is a high speed road.
Turnpike: A public or Private road for which a fee assessed for a passage.
