about oil and water, for my science. PPL PLEASE HELPP!!!!and quickkk!lol:P?

Question

Why are mixtures like oil and water difficult to keep mixed? and Why does frozen water expand and cold steel shrink? i am so totally lost [*] WHO EVER CAN ASNWER BOTH THESE QUESTIONS CORRECTLY AND FIRST GETS BEST ANSWERR!!!!![*] but mainly the second question...

Answer 1

Water is the only element on Earth like that ! Water Can not be compressed !

Answer 2

The reason oil and water don't mix is because water is denser than oil, so the oil will want to rise above the water.

Water is a special substance. It is one of the few substances that actually becomes less dense as it gets colder (lucky for the fish). I think it has something to do with the fact that water is made of two elements that are normally gases, but are combined to be a liquid. Steel is made of elements that are naturally solid, and those elements will contract together when cold.

Answer 3

Oil molecules are non-polar, while water molecules are strongly polar. If oil and water are mixed, there will be much more attraction between two nearby water molecules than two oil molecules or one oil and one water. So the water molecules tend to pull towards each other and clump together, causing the mixture to separate out.

Frozen water expands because as it freezes it changes structure. The crystalline structure of ice has a larger distance between water molecules than the liquid form, so as it freezes it expands.

Cold steel shrinks because the thermal motion of the molecules is less. This means they don't push against each other so much, so there's less outwards force and the size decreases.

Answer 4

water, when it freezes, forms a tetrahedron where the H-O-O are interlocking, and in the middle can trap an air molecule. that is part of the reason why there are bubbles in ice. Also, the fact that ice floats makes us all live, otherwise, lakes could freeze from the bottom up, and all fish would die.

for oil and water, it is the density of them, oil is lighter and they dont mix like salt and water for ex. they dont dissolve each other and become one like salt water. it is not a solution but a dispersion, and they separate after you mix them bc they never become one solution where one dissolves in the other. Water and oil are not solvents. Cold steel "contracts", as the tiny FE elements come closer together when it gets cold, like all metals do (maybe not mercury, not sure)

Answer 5

They have different densities. And water espands because the ordered arrangement of ice cubes takes up for space than the moving unorderliness in the liquid. Cold steel is a whole different thing because it isn't changing state, the molecules just lock more tightly.

Answer 6

When you get guys like a failed politician like Al Gore who knows nothing on science and earth climate change and cycles and you believe what his video . The ice melting on Gore`s video was probably taken in summer ice melts in summer . There are scientists on both sides of this some saying we are warming others we are cooling . back in the 60`s and 70`s these same people were saying we are headed into another ice age. They cannot predict next weeks weather let alone ten or twenty years down the road.

Answer 7

b/c oil likes to stick together, and b/c it is heavier than water

frozen water expands b/c ice forms a crystal structure that takes more space than original water. Most other substance shrink as they get colder or freeze.

Answer 8

Oil is a hydrophobic molecule. The chemical properties of oil do not allow hydrogen bonding with the water which is what causes molecules to be suspended in solution form.