Building Blocks 1d Int 2 1 2 3 4 5 6 7 8 9 1 0 1 1 1 2 1 3 1 4 1 5 2 2 2 3 2 4 2 5 2 6 1 6 1 7 1 8 1 9 2 0 2 1
Dec 17, 2015
What holds the atoms together in a covalent bond?
The two positive nucleus attract the shared pair of electrons.
--
shared pair of electrons
+ +
Which type of bond is formed when the attraction of the non-metal atoms for the bonded electrons is different?
Non-polar covalent
Are the covalent bonds in water highly polar or non polar?
Highly polar-
hydrogen and oxygen have different attractions for the
bonded electrons.
H H
O
Do metals lose or gain electrons?
Metals lose electrons
Group 1 - lose 1 electron
Group 2 - lose 2 electrons
Group 3 - lose 3 electrons.
What is formed when a metal loses electrons?
Positive ion X+
Group 1 form X+
Group 2 form X2+
Group 3 form X3+
Do non-metal atoms lose or gain electrons?
Gain electrons
Group 5 gain 3
Group 6 gain 2
Group 7 gain 1
What is formed when a non-metal atom gains electrons?
Negative ion Y-
Group 5 form Y3-
Group 6 form Y2-
Group 7 form Y-
What is metallic bonding?
A force of attraction between positively charged
ions and delocalised electrons in a metal.
Which of the following are covalent compounds?
Sodium chloride, potassium fluoride, nitrogen dioxide, iron oxide,
sulphur dioxide
Nitrogen dioxide and sulphur dioxide
(compounds made up of non-metal atoms)
Name the diatomic elements?
hydrogen H2, nitrogen N2, oxygen O2, fluorine F2, chlorine Cl2, bromine Br2,
iodine I2
Is carbon monoxide or carbon dioxide a diatomic
compound?
Carbon monoxide CO (2 atoms)
- carbon dioxide CO2 is a molecule made up of 3 atoms.
Are the bonds between covalent molecules stronger or weaker than
the covalent bonds within molecules?
Weaker
HH
O
H
HO
weak
strong
Which type of substances exist as a lattice structure?
Covalent network - a giant lattice of covalently bonded atoms.
Ionic - a giant lattice of oppositely charged ions.
Metals - a giant lattice of positively charged ions and delocalised electrons
What does the formula for a covalent network substance and an ionic
compound give?
The simplest ratio of atoms of each element - covalent network
The simplest ratio of positive to negative ions - ionic compound
What does the formula for a discrete covalent substance give?
The actual number of atoms in each molecule