chemistry december test

Covalent bonding

• non metal to a non metal

• Formed when two positive nuclei are held together by their common attraction for a shared pair of electrons

• Sharing of electrons to achieve a stable electron arrangement of noble gas

Ionic bonds

• form between metal and non-metal

• The electrostatic attraction between positive and negative ions

• Lose/gain of electrons to make ions

Covalent moleculer

• Low melting point and boiling point

• Don’t conduct

• Strong covalent bonds within molecules and weak between molecules

Covalent network

• High melting point and boiling point

• Don’t dissolve in water

• One giant structure with strong Covalent bonds

Ionic compound

• High melting point and boiling point- strong ionic bonds

• Don’t conduct when solid , only went in a solution or molten as ionic lattice breaks up allowing the ions to be free to move

• Form lattice structures of oppositely charged ions with each positive ion surrounded by negative ions and each negative ion surrounded by positive ions

Ion

Formed when atoms lose or gain electrons to keep stable electron arrangement of noble gas

Knowledge of chemistry- magnesium oxide

• when magnesium burns in oxygen, it reacts to form magnesium oxide. The magnesium combines with the oxygen from the air, so the mass of the product is heavier than the original magnesium. This happens because oxygen atoms join the magnesium atoms.

• Magnesium gain oxygen, making the final mass bigger than just magnesium alone.

Before- Mg + O2

After - MgO

• mg = O

• Draw experiment diagram

Ña, K, Mg

• metallic bonding

• Lattice structure

• Metals

He, Ne, Ar

• no bonding

• No structure

• Non metals

H2, N2, O2

• covalent bonding

• molecular structure

• Non metals

C, Si

• network structure

• Covalent structure

• Non metals

NaCl, MgO

• ionic compound

• Ionic bonding

• Lattice structure

CO2, H2O

Covalent bonding

Molecular structure

Covalent compound

SiO2

Covalent compound

Covalent bonding

Network structure

What are there between molecules

Weak forces of intermolecular attraction

Group ions require brackets when…

There are multiples

Transition metals have what valency

Assumed 2

If silver it is always 1

How to know charge

Size of valency

Valency is

Number of unpaired outer electrons

Metals make what ions

Positive

Non metals make what ions

Negative