Question

1. Boron resembles silicon in many of its properties. What is this resemblance generally known as? 

2. What is dry ice? What is it used for? 

3. What are silicones? How do they differ from silicates?

Answer 1

1. Diagonal relationship 

2. Carbon dioxide can be obtained as a solid in the form of dry ice, by allowing the liquied CO₂ to expand rapidly. Dry ice is used as a refrigerant for ice-cream and frozen food.

3. Silicones are a group of organosilicon polymers containing R₂SiO repeating units. Silicates are minerals with SiO^4-₄ as the basic structural unit. In silicates either the discrete unit is present or a number of such units are joined together via corners by sharing 1, 2, 3 or 4 oxygen atoms per silicate units.