Unit 1: The Chemistry Of Life Flashcards
Simplest structure; has weight; can’t break down; takes up space.
Ex: Water
Element
Two or more atoms joined together
Molecule
Substance contains atoms of two or more different elements
Ex: CO2
Compound
Major Elements
C-H-O-N
When an element has a different number of neutrons than protons
When an element has a different number of neutrons than protons
Reactions that holds atoms together to form molecules
Chemical bonds
Attraction between oppositely charged ions
Ionic bond
Elements that becomes charged by loss or gain of electrons and can be + or -
Ions
Atoms share electrons and form bonds between atoms
Polar covalent/hydrogen bond
Attract other polar molecules; good solvent chemical reactions in the body
Strong polarity
Water molecules stick to other water molecules; cushion in the body against trauma
Cohesion (surface tension)
Absorb heat when they form and release heat when they break. Minimizes temperature changes and keeps body temperature constant
High specific heat
Synthesis reaction (anabolism)
A + B —> AB
Ex: stirring chocolate milk
Decomposition reaction (catabolism)
AB —> A + B + Energy
Releases energy
Exchange reaction
AB + CD —> AD + CB
