Professionals in a scientific laboratory and in the healthcare field need to accurately prepare solutions for a number of reasons. if you wear contacts, you probably use a saline solution to rinse your contacts. what solutions do you use at work? how would you calculate the amount of solute to the solvent to prepare this solution? if you do not wear contacts but you use or make cleaning solutions for your housework, how would you accurately prepare solutions to clean? what solutions do you use that use percent concentration? give an example

Solutions are made up of two components; these are the solutes and the solvent. knowing the exact amount of each of this within a solution is important for scientists ; this is mostly expressed as concentrations of solutions

Explanation:

The concentration of solutions are usually expressed using different annotations. it can be expressed as molarity, %w/v, %w/w, %v/v.

To calculate the amount of solute needed to prepare a solution , one must understand the unit used to express the concentration of the solution

For example, a 10%w/v solution of NaOH means the solution contains 10 g of NaOH pellets dissolved in 100 mL of distilled water .

i use 0.25M sucrose solution more in my laboratory and i prepare

0.25 M means in 1000 ml of sucrose solution there is 0.25 mole of sucrose ;

no of mole =  mass/molar mass

molar mass of sucrose is 342.297 g/mol thus

mass = no of mole x molar mass

0.25 mol x 342.297 g /mol

= 85.57 g

answer: they produce more slow than unicellular organisms.

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.