V. Choose which term refers to each statement in numbers 1 to 8. A. surface tension B. viscosity C. boiling point D. heat of vaporization 1. It is responsible for the spherical drops of water and is the reason why some insects can walk on the surface of the water. 2. It is a measure of a liquid's resistance to flow. E. The temperature at which the vapor pressure of the liquid is equal to atmospheric pressure. - The heat needed to vaporize a certain amount of liquid. A certain substance A has a boiling point of 78°C and substance B has a boiling point of 110°C. Answer the following questions and explain your answer in each case. Which substance has a higher vapor pressure? Which substance has a stronger force of attraction? Which substance has a higher heat of vaporization? Which one will have a higher viscosity?

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Crystal Structures

Solids are present all around us. They have different properties and applications. Diamond and graphite are two well-known solids. Diamond is the hardest material in the world and is used in making jewelry. Graphite on the other hand is soft. The lead of your pencil is graphite. Why are they so different in appearance and properties despite the fact they are chemically the same? Both are allotropes of carbon. The answer lies in the structure, the way constituent particles are arranged in the solids.