A container is filled with 0.25 liter of water and 0.75 liter of oil. At first the oil and water appear to mix, but after 10 minutes the oil and water separate as shown. This separation occurs because the
oil -
A. has a greater volume than the water
B. has a greater mass than the water
C. is less soluble than the water
D. is less dense than the water
Hey

Explanation:

Water molecules are polar molecules. That means one end of the molecule has a positive charge and the other end has a negative charge. This allows water molecules to bond together. Oil molecules, on the other hand, are non-polar.

Have you ever dissolved salt in water? How about sugar or coffee grounds? These things mix easily with water because they also have polar molecules. They’re able to bond with the water molecules.

However, non-polar molecules only mix well with other non-polar molecules. This explains why oil doesn’t mix well with water. Their molecules aren’t able to bond.

So what happens when you try to mix oil and water? The water molecules attract each other, and the oil molecules stick together. That causes oil and water to form two separate layers. Water molecules pack closer together, so they sink to the bottom, leaving oil sitting on top of the water.

Have you ever shaken a bottle that contained both oil and water? If so, you know that the two did mix for a short time. That’s because you caused emulsion. You forced the liquids to mix with each other. However, that mixing doesn’t last long! If you look at the bottle again after a minute or so, you’ll see that the water and oil have separated once again.

You can get oil and water to mix together for longer periods. You just have to add an emulsifier. That’s a molecule with one end that has one polar end and one non-polar end. Egg yolks are common emulsifiers. So is soap! It attracts oil on one end and water on the other. That’s what it does when it cleans your hands!

The next time you’re in a restaurant, look for a container of oil and vinegar dressing sitting on the table. Is all the oil at the top? That’s because the vinegar is mixed with water. Give it a good shake and watch what happens!

you are certainly talking about this picture:

a: is the label of the white square, it is showing the  replication fork, formed by helicase (d) ==> so it is the site of dna separation and replication 

b: is a new dna brand that is following directly the replication fork, so it is continuous ==> built continuously from 5' to 3

c: dna polymerase cannot replicate dna on its own, it needs the of their proteins, and one of them plays the role of a clamp which fixes  the dna with the dna template and increases  the processivity of the enzyme. ==>   stops polymerase from falling off the  template.

d: is the enzyme responsible for forming the replication fork (helicase) ==> unwinds and separates dna into two strands

e: is the delayed strand, it is built  in the opposite sense of the helicase, so dna will be built in fragments ==> built  fragments from 5' to 3 joins

and finally f: is the enzyme that builds  the new dna strand (dna polymerase) ==>   adds nucleotides to make a new dna helix.

credit: gradman555p98x9p

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