chp 4 ; chemical bonding & structure and properties of material Flashcards
(23 cards)
3 types of chemical bonding
ionic bonding
covalent bonding
metallic monding
what is chemical bonding
atoms of the same or different types chemically joined togehther
why do atoms bond?
to achieve stable electronic configuration of noble gases
what is ionic bond
the electrostatic force of attraction between ions of oppositive charges
what happens to the metal and non metal during ionic bonding
metals lose electrons to form cations (positive ions) while non metals gain electrons to form anion (negative ions)
what happens in ionic bonding
metals transfers electrons to non metals so that botj obtain stable noble gas configuration
metals lose eleectrons, forms positive ions (cation)
non metals gain electrons, forms anion (negative ions)
what is ionic compoud
it is a neutral substance that consists of ions of opposite charges held together by ionic bonds
structure of ionic compound
gicls
giant ionic crystal lattice structure
the bigger the charges on the ions…..
the stronger the electrostatic forces of attraction and the higher the m + b point
what is covalent bonding
the sharing of electrons between two non metals in order to achieve stable noble gas configuration
the number of covalent bomds equals to…..
the number of pairs of shared electrons
what is the structure of simple covalent molecules
sms
simple molecular structure
what is the structure of giant covalent substance
g,ms
giant molecular structure
what is metallic bonding
the electrostatic forces of attraction between positively charged ions in a metal and the sea of delocalised electrons
what is the structure of metallic bonding
gmls
giant metallic lattice structure
what is a element
a substance that cannot be broken down into simpler substances by ordinary chemical methods
what is a compound
a substance combining two or more elemtns chemically joined together
mixture
contains 2 or more substances that are not chemically bonded together
properties of element
fixed composition by mass
fixed b+m point
properties of compounds
fixed composition by mass
cannot be separated into its constituent eleemtns
do not have the properties of its constituent elements
fixed b+m point
properties of mixtures
variable composition of the constuents by mass
can be separated into its constituent substances by physical methods
have properties of its constituent substances
have variable b + m point
