BIOLOGY 151 MCPHS (TEST 1) EXAM QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS VERIFIED LATEST UPDATE
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Course
MCPHS
Institution
MCPHS
BIOLOGY 151 MCPHS (TEST 1) EXAM QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS VERIFIED LATEST UPDATE
Atom
Smallest unit of an element
Element
A unit of matter that cannot be broken down chemically into other substances
Molecule
Two or more atoms held together by a covalent bond
Compound
T...
A unit of matter that cannot be broken down chemically into other substances
Molecule
Two or more atoms held together by a covalent bond
Compound
Two or more elements that chemically combine to make a new substance
Mass of proton
Approx. 1 dalton
Mass of neutron
appox 1 dalton
Mass of electron
, Negligible
Isotope
An atom of a given element with the same atomic number but different mass number
Potential energy of an electron
Is increased as the distance between an electron is from its nucleus
Valence Electrons
The electrons in the outermost shell (main energy level) of an atom; these are the electrons involved in
forming bonds.
Covalent bond
Sharing of a pair of valence electrons by two atoms. Can be polar or non polar.
Polar
Having a pair of equal and opposite charges.
Nonpolar
Equal sharing of electrons
Example of Covalent bond
Methane: (CH4). Non-polar
Water: (H20) Polar.
Ionic Bonds
Formed due to the attraction between oppositely charged ions (cations and anions)
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