Learning goal 1: Identify the reason why oil and water can be separated using flotation.Oil is more dense than water so floats on topOil is more dense than water so sinks to the bottomOil is less dense than water so floats on topOil is less dense than water so sinks to the bottom

The reason why oil and water can be separated using flotation is because oil is less dense than water, so it floats on top.

Here are the steps to understand this:

1. Density is a measure of mass per unit of volume. Substances with higher densities sink in substances with lower densities.

2. Oil and water are immiscible, meaning they do not mix. This is due to the fact that water molecules are polar and oil molecules are non-polar, which leads to the separation of the two substances.

3. Oil has a lower density than water. This means that, when oil is mixed with water, the oil will float to the top.

4. This property allows oil and water to be separated using flotation. The oil floating on top can be skimmed off, leaving the water behind.