Which of the following statements best describes the Propogation step of an addition polymerization reaction?
a)Step that ends the polymerization reaction by combination of two growing
chains into a single hydrocarbon chain.
b)Step in which monomer subunits are added to a growing polymer chain with
the loss of a water molecule
c)Step that begins the polymerization reaction with the use of heat and a
catalyst
d) Step in which monomer subunits are added to a growing polymer chain

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.

the density of gold = 19.3 g/cm3

the relation between density and mass and volume is

density = mass / volume

given :

mass of gold = 13 g

density = 13g / volume = 19.3

volume = 13 /19.3 = 0.67 cm^3

thus volume of gold nugget = 0.67 cm^3

a