Unit 1 Flashcards
(14 cards)
Atom
Smallest unit of matter
Element
A pure substance made up of the same type of atom
Molecule
Two or more atoms bonded together (they may be the same or different)
Ex: H2
Compound
A substance containing two or more different elements in a fixed ratio
Valence electrons
Electrons in the outermost shell involved in bond formation
Polar bond
Results when two different non metals unequally share electrons between them
Hydrogen bond
When one water molecule bonds to another molecule (weak bond)
Solution
Liquid consisting of uniform mixture of two or more substances
Solvent
Liquid (dissolving agent)
Solute
Substances dissolved
Cohesion
Water molecules stick to each other due to hydrogen bonding
Adhesion
Water sticking to other substances
Specific heat
Amount of heat a substance needs for a given increase in temperature
Evaporative cooling
Some organisms pant/sweat to cool off when hot