1. How are rates of chemical change expressed?​

Explanation:

The rate of reaction is expressed as decrease in concentration of reactant or increase in product per unit time. It is also defined as the increase of concentration of the product per second.

the positions which points up in upward carbon and down in downward carbon are axial

and vice versa holds true for equatorial positions

so the correct answer with labelled diagram will be

colorless gas, exhibiting a blue glow when placed in an electric field

b) solid

its a type of rock