Identify which of the following are considered solutions. i. a medicine that says "shake before using" ii. rubbing alcohol iii. italian salad dressing iv a soda pop drink v pasteurized milk vi black coffee

II, IV, VI

Explanation:

Rubbing alcohol is a solution of isopropyl alcohol on water.

A soda pop drink is a solution of carbon dioxide and sweetening and flavouring agents in water.

Black coffee is an aqueous solution of the soluble components of roasted coffee beans.

I is wrong. A medicine that says "shake before using" must contain an insoluble solid or liquid that must be evenly dispersed before ingestion.

III is wrong. Italian salad dressing is an emulsion of olive oil, vinegar, and other flavouring agents.

V is wrong. Pasteurized milk is an emulsion of fat globules and a suspension of proteins in an aqueous solution of lactose, salts, and other substances.

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.

a electronegativity decreases beacuse the size of nucleus is bigger.