Biology 114 Exam 1(Tyler Hodges The University of Alabama); Questions & Answers 100% Verified
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Course
BIO 114
Institution
BIO 114
Biology 114 Exam 1(Tyler Hodges The
University of Alabama); Questions & Answers
100% Verified
Anything that has mass and takes up space Correct answer-matter
a substance that cannot be broken down to other substances by chemical reactions
Correct answer-Element
a substance consisting of t...
Biology 114 Exam 1( Tyler Hodges The
University of Alabama); Questions & Answers
100% Verified
Anything that has mass and takes up space Correct answer-matter
a substance that cannot be broken down to other substances by chemical reactions
Correct answer-Element
a substance consisting of two or more different elements combined in a fixed ratio (type of
bond does not matter) Correct answer-compound
What percent of the 92 naturally occurring elements are essential to human life? Correct
answer-20-25%
smallest unit of matter that still retains the properties of an element Correct answer-
atom
How much smaller are electrons than p+ and n0? Correct answer-2000 times smaller
, Biology 114 Exam 1( Tyler Hodges The
University of Alabama); Questions & Answers
100% Verified
nucleus decays spontaneously giving off particles and energy Correct answer-unstable
radioactive isotopes
electrons have ____ (what kind of energy) Correct answer-potential energy
The more distant an electron is from the nucleus the ____ its potential energy Correct
answer-greater
1st shell max electrons? Correct answer-2
2nd shell max electrons? Correct answer-8
3rd shell max electrons? Correct answer-8
Electron shells are most stable when they are ____ Correct answer-full
electrons on the outermost electron shell Correct answer-valence electrons (chemical
behavior is determined by this)
Elements with a full valence shell are Correct answer-nonreactive
, Biology 114 Exam 1( Tyler Hodges The
University of Alabama); Questions & Answers
100% Verified
How do chemical bonds form? Correct answer-atoms with incomplete valence shells can
share or transfer electrons with other atoms
, Biology 114 Exam 1( Tyler Hodges The
University of Alabama); Questions & Answers
100% Verified
electronegativity Correct answer-an atom's attraction for the electrons in a covalent bond
What is electronegativity affected by? Correct answer-atomic number and distance at
which its valence electrons reside from the nucleus
Tell me about electronegativity and nonpolar covalent molecules Correct answer-atoms
are equally electronegative and share valence electrons equally
Tell me about electronegativity and polar covalent molecules Correct answer-one atom is
more electronegative and the atoms do not share valence electrons equally
What does unequal sharing of electrons cause? Correct answer-partial positive or
negative charge for each atom
Tell me about loss and gain of electrons in ionic bonds and the attraction Correct answer-
the more electronegative atom strips a valence electron completely away from its partner; its
an attraction between a cation and an anion
Ion? Correct answer-a charged atom (or molecule)
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