week 2 Flashcards
what is the chemical behaviour of an atom determined by a- no. protons b- no. neutrons c- no. and arrangement of electrons d- size of the atom
c
when atoms complete the outer shell of electrons they form what bond?
covalent
in a nitrogen atoms, 3 pairs of electrons are shared by 2 nitrogen atoms. what bond is this?
triple covalent
If a pair of electrons is unequally shared between 2 atoms, what bond occurs?
polar covalent
ions with a positive charge are called
cations
ionics bonds are formed by a- atoms sharing electrons b- electrons are completely transferred c- share the electron
b
the weakest bond between 2 or more atoms
hydrogen
is this a reaction of decomposition?
h2 + CL 2 = 2 HCL
yes
what reaction is this ?
A+B =AB
synthesis
inorganic compounds that are soluble and whose ions will conduct electrical current
electrolytes
the bond between sodium and chloride in the compound sodiumchloride is what bond?
ionic
identify cations a- Na b-Cl c- K d- Na & Cl d- Na & K
d
which one is an anion a-Na b-Cl c-K d-a&b e- a&c
b
which of the following indicate one containing only trace elements a-sulphur/Cl/O b- selenium/H/Ca c-boron/O/C d- silicon/florine/tin
d
when a needle is floating on the surface of a glass of water what is it called
surface tension
Eg of an organic substance a-table sugar b-sodium c-table salt d-oxygen
a
Eg of an inorganic substance a-fructose b-water c-lipid d-glycogen
b
what element is plentiful in the human body
oxygen
what element is 2nd abundant
carbon
what is CO2 ?
carbon dioxide
what is the molecule H2 called?
hydrogen
H2O is an eg of what formular?
a-ionic b-molecular c-covalent
b
a nanometre is ?
10-9 metre
when electrons are transferred from one to another what bond is formed
ionic
calcium has 2 electron in outer shell, when they form ions what charge would it be ?
+2 / -2
+2
a substance that consists entirely of atoms with the same atomic number is what?
element
when electrons move around the centre at high speed it forms what?
electron cloud
electrons is an atom occupy an orderly series of electron shells or ?
energy levels
a __ is a combination of 2+ atoms with different physical/chemical properties
compound
ions with positive charge
cations
ions with negative charge
anions
chemical bond between atoms were new chemical substance made is?
chemical reaction
a __ is a homogeneous mixture containing a solvent and a solute
solution
readily dissolve in water is ?
hydrophilic
does not dissolve in water is?
hydrophobic
what is a heterogeneous mixture with visible solutes that tend to settle out ?
suspensions
what is a heterogeneous mixture whose solutes do not settle out ?
colloid
what is 2+ mixtures components physically intermixed but not chemically bonded
mixtures
