Water recycles:
1)water evaporates from Earth's surface
2) Forms clouds
3) Falls back to surface as precipitation
Hydrogen bond- bonds between molecules; help hold water molecules together
Cohesion- water molecules stick together
Adhesion- the joining of two different substances due to attractive force
Density of ice and water:
solid=lower density
liquid=higher density
(Hydrogen bonds make molecules spaced out more when frozen)
Acids and Bases:
acid- higher concentration water, lower pH
base: lower concentration in water, higher pH
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Insects like water striders can walk not he surface of a pond without breaking the surface: It's tiny mass and geometry of its legs allow it to be supported by surface tension. The legs of the bug have individual spikes on the feet which allow the surface area to spread out evenly among them. Water striders would fall if soap was put in the water because the soap is a surfactant which breaks the force of the H20 bond.
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