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Biology 171 Exam 1 Test Questions with Accurate Solutions
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Biology 171 Exam 1 Test Questions with Accurate Solutions
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Biology 171 Exam 1 Test Questions withAccurate Solutions
Every atom except ________ has one or more neutrons in its nucleus. - -
hydrogen
- The sum of the atomic weights in any given molecule is called its
____________ - -mass number
- The nutritionist's Calorie, which biologists call a kilocalorie, is the
equivalent of ________ heat-energy calories - -1,000
- The water strider skates along the surface of water due to a property of
liquids called ________. - -high surface tension caused by cohesion of the
water molecules
- The attraction between a slight positive charge on a hydrogen atom and
the slight negative charge of a nearby atom is a ____________ - -hydrogen
bond
- 1.0 M solution of HCl has a pH of ________ - -zero
- The part of the atom of greatest biological interest is the ______ - -
electrons
- Hydrogen, Deuterium, and tritium all posses the same - -atomic number
- Which component of an atom does not significantly influence mass? - -
electrons
- which of the following describes an unusual property of water?
A) Three different physical phases
B) A solid state that is less dense than its liquid state
C) Heat loss when changing from a liquid to a gas
D) Limited ionization
E) All of the above - -E) All of the above
- The number of protons in an uncharged atom equals the number of
________________ - -electrons
- Because atoms can have the same number of protons but a different
number of neutrons, elements have ___________ - -isotopes
, - An element has a mass weight of 131.3, the reason the number includes
0.3 is because - -the mass weight of an element is the average each of the
isotopes for that element
- The atomic number of an element is the same as the number of - -protons
in each atoms
- The mass number of an element is the same as the number of - -protons
plus neutrons in each atom
- All except _________ abide by the octet rule - -hydrogen (rule of 2)
(phosphorous also but commonly with 10)
- In a hydrogen molecule, the two atoms are held together by - -A shared
pair of electrons
- Hydrogen bonds form ________________________ - -between different
molecules
- what determines if a molecule is polar, non polar, or ionic? - -The
differences in the electronegativities of the atoms
- Which pair has similar chemical properties?
A) 1H and 22Na
B) 12C and 28 Si
C) 16O and 8S
D) 12C and 14C
E) 8H and 2 He - -12C and 14C
- The number of different elements that exist is closest to - -96
- Which of the following elements is the most chemically reactive
A) Hydrogen
B) Helium
C) Neon
D) Argon
E) They are all the same - -Helium
- A single covalent bond represents the sharing of how many electrons? - -
two electrons (One pair)
- The molecular weight of water is 18.0154 grams. One mole of water
weighs _____________grams - -18.0154
- Ionic bonds are - -attractions between oppositely charged ions
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