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BSC 2010 exam 1 (UCF).
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BSC 2010 exam 1 (UCF)Elements - CORRECT ANSWER-Something that can't be broken down any
further by chemical reactions
The big 4: make up 96% of living matter? - CORRECT ANSWER-1. Carbon ( C)
2. Hydrogen (H)
3. Oxygen (O)
4. Nitrogen (N)
Atom - CORRECT ANSWER-smallest unit of matter retaining properties of a
given element
Dalton - CORRECT ANSWER-measure of mass for atoms
Subatomic particles - CORRECT ANSWER-Atoms of different elements differ in
# of subatomic particles
Like neutrons , electrons, Protons
Main 3 subatomic particles? - CORRECT ANSWER-Neutrons (0), protons (+),
electrons (-)
Atomic number - CORRECT ANSWER-The number of protons in an atom
Mass number: approximation of atomic mass
- # of neutrons + # of electrons = mass # - CORRECT ANSWER-approximation
of atomic mass
Number of neutrons + number of electrons =???? - CORRECT ANSWER-Mass
number
Isotopes - CORRECT ANSWER-Different versions of same element, atomic # is
same BUT mass # is different
Potential energy - CORRECT ANSWER-Changes depending on location
, Electron Shells: - CORRECT ANSWER-electrons differ in amounts of potential
energy based on their location
Electrons in first inner shell have ________ energy and the outer shells of the
nucleus have _______ potential energy - CORRECT ANSWER-Less, More
How are molecules made? - CORRECT ANSWER-Individual atoms join together
to form molecules (only outer electron shells are involved)
Valence electrons in outermost (valence) shell
determines what??? - CORRECT ANSWER-Chemical behavior of atoms
Valence number - CORRECT ANSWER-Is the # of unpaired electrons in valence
shell
Valence number determines...? - CORRECT ANSWER-# of bonds atoms can
form
Valence number of 2 means what? - CORRECT ANSWER-There is 2 unpaired
electrons, and that means it can form 2 bonds
Molecule - CORRECT ANSWER-2 or more atoms held together by chemical
bonds
Compound - CORRECT ANSWER-2 or more different kinds of atoms held
together by chemical bonds
Chemical bonds form because atoms "desire" to have what? - CORRECT
ANSWER-Atoms "desire" a full valence shell
Inert elements - CORRECT ANSWER-Already have complete valence shells so
they don't need to form bonds with other atoms
Covalent bonds - CORRECT ANSWER-Strong stable bonds.
Sharing a pair of valence electrons between two atoms, each atom appears to
have complete valence shells
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