Pattern Flashcards
3 characteristics of transition metal
catalytic property
coloured aqueous ion
variable oxidation states
what are elements arranged in the order of?
atomic number
X relative atomic mass
define periodicity
the repeating pattern of physical and chemical properties as shown by the different periods is now as periodicity
what do the number of outermost electrons governs?
chemical properties
what is the different between metalloid and semi-conductor
metalloids must be element
semi-conductor can be either element or compound
why the melting point of diamond is higher than silicon
C-C bond is stronger than Si-Si bond as the bond length of C-C bond is shorter
compare the melting point of S and Na
Na < S8
what is the trend of melting point down a group
for group 1 to 4
melting point decreases down the group because of the atomic size increasing –> metallic bond/covalent bond strength decreases
for group 5 to 0
melting point increases down the group because of the increasing strength of vdw force
what does amphoteric oxides mean
it shows both acidic and basic properties
what substances need to be out in a brown bottle
conc HNO3
KMnO4
AgNO3
because they are light sensitive
what are the common physical properties of transition metals
high melting point and boiling point as they have stronger metallic bond
high densities
good conductors of electricity
they are hard
what is the color of MnO2
brown solid
what is the required conditions of producing polyethene form polymerization of ethene
high temperature
high pressure
suitable catalyst ( TiCl4 + (C2H5)3Al )
(Ziegler-Natta polymerization)
why Fe can be a catalyst for many reaction
Fe has variable oxidation state
use of titanium
making space shuttles
as Ziegler-Natta catalyst
