Definitions D

Question 1

Dative covalent bond

Answer 1

Is shared pair of electrons in which the bonded pair has been provided by one of the bonding atoms only.

Question 2

Dehydration

Answer 2

An elimination reaction in which water is removed from a saturated molecule making an unsaturated molecule

Question 3

Delocalised electron

Answer 3

Electrons that are shared between more than two atoms

Question 4

Desorption

Answer 4

Release of an absorbed substance from a surface

Question 5

Dipole

Answer 5

A separation in electrical charge so that one atom of a polar covalent bond, or one end of a polar molecule, has a positive charge(+Delta)and the other has a small negative charge(-Delta)

Question 6

Dipole-dipole force

Answer 6

An attractive force between permanent dipoles in neighbouring polar molecules

Question 7

Displacement reaction

Answer 7

A reaction in which a more reactive element displaces a less reactive element for an aqueous solution of its ions

Question 8

Displayed formula

Answer 8

A formula that shows the relative positioning of all the atoms in a molecule and the bonds between them, shows everything

Question 9

Disproportionation

Answer 9

A redox reaction in which the same element is both oxidised and reduced

Question 10

Dynamic equilibrium

Answer 10

The equilibrium that exist in a close system when the rate of the forward reaction is equal to the rate of the reserve reaction and the concentrations do not change