CHEM 1 DEFINITIONS

Various definitions needed for AS unit CHEM 1 according to the AQA exam board.

HideShow resource information

ATOMIC NUMBER

THE NUMBER OF PROTONS IN THE NUCLEUS OF AN ATOM.

1 of 9

CATALYTIC CRACKING

OCCURS WHEN THE ENERGY REQUIRED FOR BOND BREAKING IN HYDROCARBONS IS PROVIDED BY HEAT, IN THE PRESENCE OF A CATALYST.

2 of 9

CO-ORDINATE BOND

A COVALENT BOND FORMED WHEN THE PAIR OF ELECTRONS ORIGINATE FROM ONE ATOM.

3 of 9

COVALENT BOND

A SHARED PAIR OF ELECTRONS.

4 of 9

CRACKING

OCCURS WHEN LARGE ALKANES ARE BROKEN INTO SMALLER MOLECULES.

5 of 9

DISPLAYED FORMULA

SHOWS ALL THE BONDS PRESENT IN A MOLECULE.

6 of 9

ELECTRONEGATIVITY

THE POWER OF AN ATOM TO ATTRACT THE SHARED PAIR OF ELECTRONS IN A COVALENT BOND.

7 of 9

EMPIRICAL FORMULA

THE SIMPLEST RATIO OF ATOMS OF EACH ELEMENT IN A COMPOUND.

8 of 9

ENTHALPY CHANGE

THE AMOUNT OF HEAT ENERGY RELEASED OR ABSORBED WHEN  A CHEMICAL OR PHYSICAL CHANGE OCCURS AT CONSTANT PRESSURE.

9 of 9

Comments

Merlin

good work..... i failed to put 'pair ' on the shared pair of electron so i lost marks do you know what this is the definition is for without looking?i do:)

Similar Chemistry resources:

See all Chemistry resources »See all resources »