Which intermolecular forces are present in a solution of acetone in H20, between the acetone molecules & H20 m

Question

olecules? How does this effect the floating needle?


Lab Results:

Surface Tension

Needle floats on distilled water
Needle does not float on acetone
Needle does not float on vegetable oil

Viscosity

Time for water to drain from bottle: 28 sec, 27 sec, 26 sec
Time for veg oil to drain from bottle: 1 m 15sec, 1m 16sec, 1m 15sec

Time for 5w-30 Motor oil to drain: 11m 55sec, 11m 54sec, 11m 53sec
Time for 20W-50 motor oil to drain: 35 m, 34 m 98sec, 34m 99 sec

Answer 1

It should be hydrogen bonding.... not so sure
Want to know more.....
In chemistry, a hydrogen bond is a type of attractive intermolecular force that exists between two partial electric charges of opposite polarity. Although stronger than most other intermolecular forces, the typical hydrogen bond is much weaker than both the ionic bond and the covalent bond. Within macromolecules such as proteins and nucleic acids, it can exist between two parts of the same molecule, and figures as an important constraint on such molecules' overall shape.

As the name "hydrogen bond" implies, one part of the bond involves a hydrogen atom. The hydrogen atom must be attached to one of the elements oxygen, nitrogen or fluorine, all of which are strongly electronegative heteroatoms. These bonding elements are known as the hydrogen-bond donor. This electronegative element attracts the electron cloud from around the hydrogen nucleus and, by decentralizing the cloud, leaves the atom with a positive partial charge. Because of the small size of hydrogen relative to other atoms and molecules, the resulting charge, though only partial, nevertheless represents a large charge density. A hydrogen bond results when this strong positive charge density attracts a lone pair of electrons on another heteroatom, which becomes the hydrogen-bond acceptor.

The hydrogen bond is not like a simple attraction between point charges, however. It possesses some degree of orientational preference, and can be shown to have some of the characteristics of a covalent bond. This covalency tends to be more extreme when acceptors bind hydrogens from more electronegative donors.

Strong covalency in a hydrogen bond raises the questions: "To which molecule or atom does the hydrogen nucleus belong?" and "Which should be labeled 'donor' and which 'acceptor'?" According to chemical convention, the donor generally is that atom to which, on separation of donor and acceptor, the retention of the hydrogen nucleus (or proton) would cause no increase in the atom's positive charge. The acceptor meanwhile is the atom or molecule that would become more positive by retaining the positively charged proton. Liquids that display hydrogen bonding are called associated liquids.

Hydrogen bonds can vary in strength from very weak (1-2 kJ mol−1) to so strong (40 kJ mol−1) so as to be indistinguishable from a covalent bond, as in the ion HF2−. Typical values include:

O—H...:N (7 kcal/mol)
O—H...:O (5 kcal/mol)
N—H...:N (3 kcal/mol)
N—H...:O (2 kcal/mol)
The length of hydrogen bonds depends on bond strength, temperature and pressure. The typical length of a hydrogen bond in water is 1.97 Å (197 pm).

Answer 2

Hydrogen bonding is present between acetone and water molecules.

Water has the following structure with a bent shape. H--O--H. The two H's are bonded to comparatively electronegative atom Oxygen and therefore form hydrogen bonds. (When H is on FON!! That is, Hydrogen bonding occurs when hydrogen is bonded to electronegative atoms like Fluorine, Oxygen, and Nitrogen.) The two H's are H-bond donors and can form a hydrogen bond with an O, F, or N of a neighboring molecule. Water also has a H-bond acceptor site at O which will form a H-bond with a neighboring H attached to O, F, or N.

Acetone has the formula, CH3 C=O CH3. It has an H-bond acceptor site at the O. Therefore, it will easily form H-bonds with the H of neighboring water molecules.

Also, a water molecule forms H-bonding with other water molecules and with itself as it has both an H-bond acceptor and an H-bond donor and is therefore strongly held. Whereas, acetone does not have a H-bond donor H and therefore cannot form H-bonds with other acetone molecules or even with itself.

Answer 3

I would have to say hydrogen bonding as well but I'm not 100% sure... makes sense though.... anyway... I would think that the acetone would disturb the surface tension of the water and therefore not allowing the needle to float.

Answer 4

A plant is a plant or part of a flower used as food

Answer 5

Both are good for you, each fruit/vegetable has different vitamins. Therefore as more variety, as better. Vegetables have generally less sugar than fruits.

Answer 6

There is Hydrogen-bond between acetone molecules and H2O.
O in H2O has pair I(e), these e's attach to H atom in acetone and make H-bond.

Answer 7

it's hydrogen bonding so it's gonna have a tight network and ions will be able to slip in easily. not sure on the floating needle exactly though