Question: Aerogels are compounds formed by the drying of certain gels. Although the aerogel hardens into a solid material, the particles in the gel are much farther apart than those of most solids and particles are held together by strong bridges of covalently bonded atoms. Which of the following is a likely property of aerogels?

  Options: 
 A. very low density
 B. high electrical conductivity
 C. very low melting point
 D. very flexible
Answer: A