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Biology 1100 ECU Chapter 2 Exam 1 Questions and Correct Answers $8.49
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Biology 1100 ECU Chapter 2 Exam 1 Questions and Correct Answers
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  • ECU BIO 1100
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  • ECU BIO 1100

Essential Elements of Life carbon, hydrogen, oxygen, nitrogen (make up 96% of body mass) Of the 92 natural elements, these are the key ones needed by an organism to live a healthy life and reproduce trace elements elements required by an organism in only minute (very small) quantities (less than 0...

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  • September 23, 2024
  • 5
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • biology 1100 ecu chapter 2 exam 1 questions and co
  • essential elements of life carbon hydrogen oxyg
  • trace elements elements required by an organism i

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  • ECU BIO 1100
  • ECU BIO 1100

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Biology 1100 ECU Chapter 2 Exam 1
Questions and Correct Answers
Essential Elements of Life ✅carbon, hydrogen, oxygen, nitrogen (make up 96% of
body mass)
Of the 92 natural elements, these are the key ones needed by an organism to live a
healthy life and reproduce

trace elements ✅elements required by an organism in only minute (very small)
quantities (less than 0.01% of mass)
Examples: Boron, Chromium, cobalt, cooper, fluorine, iodine, iron, manganese, silicon,
tin

Atom ✅the smallest unit of matter that still retains the properties of an element

What are the three Subatomic particles (smaller parts of atoms) ✅1. Neutrons
2. Protons
3. Electrons

Neutron ✅A subatomic particle that has NO ELECTRICAL CHARGE and that is found
in the nucleus of an atom

Proton ✅A subatomic particle that has a POSITIVE charge and that is found in the
nucleus of an atom

Electron ✅A subatomic particle that has a NEGATIVE charge

Dalton ✅-A measure of mass for neutron mass and proton mass in atoms and
subatomic particles;
-the same as the atomic mass unit, or amu.

atomic number ✅the number of protons in the nucleus of an atom

mass number ✅the sum of the number of neutrons and protons in an atomic nucleus

atomic mass ✅- an atoms total mass
- it is approximately the same number as the mass number (sum of protons and
neutrons)
- atomic mass = mass number

Isotopes ✅Atoms with the same number of protons but different numbers of neutrons

, radioactive isotope ✅An isotope whose nucleus decays spontaneously, giving off
particles and energy.

Energy ✅The ability to do work or cause change

potential energy ✅the energy that matter possess because of its location or structure

electron shell ✅-An energy level representing the distance of an electron from the
nucleus of an atom.
-the energy level will increase with the distance from the nucleus

valence shell ✅-the outermost shell of an atom
-the chemical behavior of that atom depends on the number of electrons in the
outermost shell

valence electrons ✅The electrons in the outermost shell (main energy level) of an
atom; these are the electrons involved in forming bonds.

chemical bonds ✅the attractive forces that hold atoms close together

covalent bond ✅the sharing of a pair of electrons between two atoms in a molecule

Molecule ✅two or more atoms held together by covalent bonds

single bond ✅a covalent bond in which two atoms share ONE pair of electrons
-shown by 1 line (H-H)

double bond ✅A covalent bond in which TWO pairs of electrons are shared
- shown by 2 double lines (O=O)

valence or bonding capacity ✅Number of additional electrons needed to complete the
atom or fill the valence shell

Electronegativity ✅- an atom's attraction for the electrons of a covalent bond
-the ability of an atom to attract electrons

non polar covalent bond ✅atoms share electrons equally

polar covalent bond ✅- The unequal sharing of electrons
- unequal sharing of electrons causes a partial positive or negative charge for each
atom molecule

ionic bond ✅-the attraction between oppositely charged ions (cation and anion)

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