1. compare and contrast substances and mixtures. give
two examples of each.

A substance is a sample of a specific type of matter, such as:

-water

-dirt

-

A mixture is a combination of two or more contrasting substances, some mixtures fully combine to create a new substance and some mixtures simply create combinations such as:

-A mixture of dirt + water creates mud which is an example of a new substance

-A mixture of cheese + ham + bread creates a sandwich which is an example of a combination

Hope this helps :)

"hydrogen bonding is the attraction of h atoms in the water molecule (slight + charge) to o atoms in a neighboring water molecule (slight - charge); it is a weak interatomic force. but it is still strong enough to the water molecules "stick" together."