Outcome 2- Intramolecular bonding: Covalent Bonding Flashcards Preview

Unit 1 Chem > Outcome 2- Intramolecular bonding: Covalent Bonding > Flashcards

Flashcards in Outcome 2- Intramolecular bonding: Covalent Bonding Deck (22):

Types of bonds broken- N2->N2

Dispersion forces


Types of bonds broken-hg->hg

Metallic bonds


Types of bonds broken- 2NaCl-> 2NA+CL2

Ionic bonds


Hydrogen bonding

Can only occur with oxygen,florine and Nitrogen


A typical feature of covalent molecular substances

They are gases, liquids or soft, low melting point solids at room temperature


Type of Bond must be broken for water to vaporise

Hydrogen bonds only


Difference between ionic and molecular substances

Do not conduct In the molten state, whereas ionic substances do


Why do H:Y:H and .. not have the same shape
H :Z:H

Because Element Y has 2 lone pairs which are not included in the lewis diagram whereas Z has no lone pairs. Y would perfrom a Linear shape where Z is a tetrhdyral shape because Y is a group 16 atom and Z is a group 14 atom


Ethanol (CH3Ch2Oh) has a

A High melting point


Graphite is



Methane (Ch4) does not

Conduct electricity in the solid or aqueous state


Polar Molecule

When a stronger attraction comes from the element with a higher electronegativity. Must have different electronegatvity and or an incomplete turnaround


Non Polar Molecule

Molecular elements are always non polar because they have the same electronegativty


Why are Molecular compounds sometimes polar and non polar?

It depends on their electronegativity. It also depends on the shape of the molecule as well on bond dipoles. If the bond dipoles cancel out then it will be non polar


The intramolecular and intermolecular forces in water

Dipole dipole, hydrogen bonding and dispersion forces


Why is the density of ice less than the density of water

Because the regular arrangments of the water molecules in ice take up more space than the irregular arrangment of molecules in liquid


What is a Covalent bond?

A bond that exists with only non metals. Neighbouring atoms share electrons to achieve a full outer shell. Atoms try to achieve a stable noble gas config of 8 outer shell electrons


What are the physical properties associated with covalent bonding?

Do not conduct electricity because the molecules are electrically neutral, Vary in their solubility (Polar compounds are soluble in polar solvents such as water but in soluble in non polar solvents), Have low boiling and melting points since the forces between them are weak.


The trend in physical properties based in the intermolecular forces in operation?



What type of bonding occurs between water in its different states?

Hydrogen bonding, Di-dipole bonds and dispersion forces


Water in liquid

Water molecules move too quickly in liquid form to form regular structures however they still remain attacthed.


Water being frozen

Water molecules expand when frozen. Water molecules join together to form hexagonal structures