1st Nine Weeks Flashcards
what is water considered
A polar substance because it has opposite charges
ice is _______ dense than water
less
condensation occurs
when the temperature of gas close to 100°C it changes back to a liquid
water is called the ______ because it dissolves more substances than anything in the world
universal solvent
capillary action
combined force of attraction among water molecules and w/molecules of surrounding materials
condensation
process by which gas changes into liquid
evaporation
process by which molecules @ surface of liquid absorb enough energy to change to gaseous state
specific heat
amount of heat needed to increase the temp of certain amount of a substance by 1 degree Celsius
surface tension
tightness across surface of water caused by polar molecules pulling on each other
capillary action facts
- explains how water moves against force of gravity
* due to attraction among molecules of water and surrounding materials
capillary action allows
water to move up a straw
mixture of cohesion and high adhesion
evaporation facts
- occurs as water molecules absorb energy
- occurs @ surface of liquid
- example - drying hair after swimming
condensation facts
- occurs as water molecules slow down
* example - clouding up cold window w/breath
cohesion
ability of H20 molecules bonding w/other H20 molecules
adhesion
ability of molecules to stick to other substances
decomposition
breaks down compounds into simpler products
exothermic
chemical reaction that absorbs energy in the form of heat
what does water contain
two positive hydrogen atoms and one negative oxygen atom
