Astudent creates a ball-and-stick model to represent the atomic scale of a substance. which of the following best describes the model? a. 1 molecule with 10 atomsb. 1 element with 10 moleculesc. 10 molecules representing 10 elementsd. 10 elements representing 10 molecules

Option A. 1 molecule with 10 atoms

Explanation:

Each ball in the diagram represents an atom and the stick represents a bond.

A careful look at the diagram of the student's model reveals that the student's model contains 10 balls which represents 10 atoms. This means that a molecule of the student ball-and-stick model contains 10 atoms.

b) mutualism

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hydrocarbons are organic compounds that contain only hydrogens and carbons. they can be saturated (those which contain only carbon-carbon single bonds) or unsaturated (those which contain carbon-carbon double or triple bonds) in nature. hydrocarbons can undergo several reactions like substitution, elimination etc.  

on substituting one or more hydrogen atoms in hydrocarbon it results in the formation of haloalkane. as the halogen atoms are large compared to the carbon and hydrogen atoms, due to which the molecular weight increases and the bond become polar because of presence electronegative halogen atom and results in the increase in boiling point of the haloalkane.

thus, the correct option is (b) that is the boiling point of the new compound increases on substituting a hydrogen atom with a halogen in a hydrocarbon.