HELP! chemistry lab question!! very confusing! due today!!?

Question

Sponges and fabrics absorb and hold water by capillary action. Some sponge materials and fabrics, like cotton, hold more water and dry more slowly than others. Relate the ability of these materials to hold water to the polarity of their molecules, and think of an example where this property is not desirable!
this is a lab question and its very confusing!

Answer 1

In general, materials that hold more water have "polar" molecular structures. This is sort of the same as "like dissolves like", molecules that are more like water (i.e.- they have polar bonds or have an overall dipole moment) will more strongly interact with it.



This property wouldn't be desirable if you wanted something that was waterproof. One example is rain gear (rain coats or umbrellas). You don't want these fabrics to absorb water so they would ideally be made of fabrics that are not polar and don't interact strongly with water.

Answer 2

The first thing to understand is "polarity". Actually, it is very much like the poles of a magnet. The opposite poles attract one another. The same poles repel one another. Water molecules behave very much like tiny magnets. The Oxygen atom has lots of electrons and is far more negative in charge than the Hydrogen atoms. This makes water positive on one side and negative on the other. The individual molecules then line up like tiny magnets. Of course the Hydrogens are also attracted to Oxygen atoms in other molecules. The strongest attraction is to an oxygen with a Hydrogen atom attached to it. This is called a hydroxyl group. Proteins and especially carbohydrates have lots of these hydroxyl groups. Cotton is made mostly of cellulose. cellulose in turn is composed of glucose. The glucose molecules are all connected together in incredibly long chains. This is called a polymer. DNA, proteins and plastics are also polymers. Cotton absorbs water because the individual molecules of water are attracted to the many hydroxyl groups cellulose has. Nonpolar substances do not have any polar groups. Plastic is a good example of a nonpolar substance. The plastic is mostly Carbon and Hydrogen and there is no polarity. Hydrogen atoms have the same charge, so the plastic repels water. This is also why oil and water don't mix. Oil is also non polar.

Answer 3

CuCl2 is a hydrate, yet it extremely is fairly basically going to remember for once you're weighing it out to place into your answer (the mass of "dry" chemical is going to be bigger than if it have been anhydrous CuCl2). so some distance as balancing the equation is going, as quickly as CuCl2 is in answer, there is lots of water to bypass around, and the water that befell to be interior the forged will combination in with something (and in lots of circumstances no longer play an instantaneous place interior the reaction stoichiometry). so some distance as for an unbalanced equation is going, the best one is fantastic. To stability it you will ought to have 2 Aluminums for each 3 Copper(II) Chlorides