Biology Book Report
Define element, atom, compound, molecule, and trace element.ELEMENT: a substance that cannot be broken down to other substances by chemical reactions. COMPOUND: a substance consisting of two or more elements combined in a fixed ratio.MOLECULE: two or more atoms held together by covalent bondsTRACE ELEMENTS: those required by an organism in only minute quantities.Give the mass, charge, and location of each sub-atomic particle. Mass= 1 Dalton or 1.009 grams or 1.7 x 10-24 Mass= 1 Dalton or 1.007 grams or 1.7 x 10-24 Mass= we ignore the mass of an electron Location=moving nearly at the speed of light, electrons form a cloud around the nucleus.Define and use atomic number and atomic mass number.ATOMIC NUMBER: the number of protons in an element. Is written as a subscript to the left of the symbol for the element.ATOMIC MASS NUMBER: the sum of protons plus neutrons in the nucleus of an atom. The mass number is written as a superscript to the left of an element's symbol.Explain why isotopes have similar chemical and the
These Van der Waals interactions are weak and only occur when atoms and molecules are very close together. What determines the number of covalent bonds that form?The number of electrons required to complete required to complete an atom's valence shell determines how many bonds that atom will form. H2O2 N2H2OCH4 NH 3How does molecular shape emerge from orbital chemistry?Molecular shape is due to hybrid orbitals. 9 page 28List the 6 main covalently bonding atoms and 5 main ions. As products accumulate, collisions resulting in the reverse action. 2s-The second electron shell can hold eight electrons, two in each of the four orbitals. *Electrons like all matter tend to exist in the lowest available state of potential energy. Biologically important molecules generally have a valance of 5, forming three single bonds and one double bond. Chemical equilibrium is reached when the forward and reverse action rates are equal. Explain the chemical basis of the weak bonds: ionic, hydrogen, Van der Waals, and hydrophobic.
Common topics in this essay:
ENERGY LEVEL,
CH4 NH,
ATOMIC MASS,
BONDS Define,
Charge=negative Location=moving,
NEUTRON Mass=,
TRACE ELEMENTS,
PROTON Mass=,
ELECTRON Mass=,
valence shell,
**see fig,
covalent bond,
energy level shell,
level shell,
van der,
molecular shape,
energy level,
covalent bonds,
atoms molecules,
valence electrons,
,
van der waals,
level shell energy,
17 10-24 charge=,
grams 17 10-24,
|
Acceptance Essays
