Activity 4 1-11-11 Water?

What elements make up water?

Water is made up of two hydrogen atoms and one oxygen atom. The formula for water is H2O.

Is water an ionic compound or a covalent compound?

Water's oxygen-hydrogen bonds are considered covalent.  It is not considered an ionic compound because it does not exchange the electrons between atoms in the molecule, but shares them. 

What is the shape of water?

Water does not have its own distinct and constant shape.  Water takes on the shape of its surroundings.

Why does water stick to itself?

Water has a high level of surface tension. Cohesion refers to the fact that water sticks to itself very easily. 

Why does water not stick to or mix with oil?

Water molecules are polar – they have a small positive charge at one end and a small negative charge at the other end, and they stick to each other. Oil molecules are non-polar – they have no charge. Because of this, oil molecules are more attracted to each other than to water molecules, and water molecules are more attracted to each other than to oil molecules.

http://www.scienceprojectideas.co.uk/why-oil-water-dont-mix.html