Define hydrogen bond. Is it weaker or stronger than the vander Waals forces?

Define the terms Hydrogen bond-

Bone in stronger than cartilage. Give reasons.

Give reason:C-F bond is stronger than C-Br.

What is a hydrogen bond?

Name type of absorption in which van der Waal's forces are present.

Define buoyant force.

_________ is the process is which adsorbate molecules are held on the surface of the adsorbent by weak van der Waals forces.

How many hydrogen bonds exist between cytosin and guanine?

Define : Bond Length

Define : Bond Enthalpy