Biology
True or False A hydrogen bond is completed by the transfer of its sole electron to another element
False
True or False Atoms which posses completed outer energy level or have a stable octet are inert
True
True or False Salts help to maintain the natural ionic concentration of an organism
True
cation plus hydroxyl ion in water
base
ionic bond
bond formed by the electrical attraction between to oppositely charged ions
organic molecules always contain...
carbon
covalent bond
chemical bond formed between two atoms by the sharing of electrons
Valence is the number of electrons an atom must gain or lose in order to _______________ its outer energy level or have a stable octet
complete
bond between to non-metals
covalent
The sharing of electrons between two or more atoms
covalent bond
acid
any substance that donates a hydrogen atom during disassociation
Which valences have the greatest tendency to form ions?
1, -1 ,2 ,-2 ,3 ,-3
pH of water is...
7
pH scale ranges between...
7 and 14
A water molecule is held together by...
A covalent bond
ion
An electrically charged atom or group of atoms formed by the loss or gain of electrons
chemical bond
An union between atoms by interaction of their electrons in the outermost orbit
Sodium ion is written as...
Na+
chemical reaction
When atoms of elements or compounds interact to form at least one new compound
anion plus hydrogen ion
acid
What happens when an atom is supplied with excess energy?
an electron may change to an excited state an electron may move to a higher energy level
hydrogen bond
an intermolecular force(attraction) between a hydrogen ion and fluorine, oxygen and nitrogen atoms
base
any substance capable of combining with hydrogen (donates OH-)
Second energy level (n=2) contains maximum of how many electrons?
eight
Third energy level (n=3) contains maximum of how many electrons?
eighteen
An electron in the second energy level has more ____________ than an electron in the first energy level
energy
True or False All subatomic particles participate in a chemical reaction
false
True or False Water can only dissolve inorganic compounds
false
Water molecules are attracted to each other by...
hydrogen bonds
chemical compound not containing carbon
inorganic
Characteristics of a hydrogen bond
intermolecular force between hydrogen, and oxygen, nitrogen or fluorine hydrogen attracted to weak positive atoms
bond between metal and non-metal
ionic
inorganic compounds are held together by __________ bonds
ionic
An ionic bond...
is the attraction of two oppositely charged ions involves actual transfer of electrons
H2O
molecule
anion
negatively charged ion (gains an electron)
any chemical compound containing carbon
organic
measure of hydrogen ion concentration in a solution
pH
cation
positively charged ion (loses an electron)
synthesize means
put together
formed by ionic bonding between a cation and anion
salt
when salts dissolve into water they....
separate into ions
substance which dissolves in liquid
solute
a liquid which acts to dissolve or suspend solutes
solvent
valence
the number of electrons an element must gain or lose in order to complete its outer electron shell
First energy level (n=1) contains maximum of how many electrons?
two
When does an atom give up electrons?
when less then half of the outer energy level is filled
When does an ionic bond occur?
when to atoms exchange electrons and become ions
organic fats _______ dissolve in water
will not