MATERIAL SCIENCE QUIZ WEEK 6

Categorize all these type of primary bonds

Groups:

(a) IONIC BONDS

,

(b) COVALENT BONDS

,

(c) METALLIC BONDS

• Produce from electrostatics force between ions of opposite charge (+ -)

• formed in metals & their alloys

• bonding force produced from attraction between shared electron

• each atoms supplies one (1) or more electrons that drift throughout the entire metal

• produced from sharing of electrons between adjacent atoms

• an atom which loses the electron becomes positively charge (cation)

• at least one (1) atom donating one electron to be shared with adjacent atom.

• one (1) or more electrons are transferred from one (1) atom to the other

• valence electrons are not tied to any particular atoms

Ionic solids which have higher lattice energy will have lower melting point.

• TRUE

• FALSE

In CH4 (​ (a)   ) molecule, atom C has ​ (b)   valence electrons and while atom H has ​ (c)   valence electrons.

• Methane

• four

• one

• Ethane

• five

• two

• Butane

• Propane

Why do materials with metallic bonds are good in conducting heat and electricity?

• Because it is produced from electrostatic force between ions of opposite charge.

• Because the electron valence can move freely.

• Because the bond can exist in the form of solid, liquid and gas.

• Because they share electrons.

Organize these examples of materials around us.

Groups:

(a) POLYMER

,

(b) CERAMIC

• Wall tiles

• Crucibles

• Polyvinyl Chloride

• Polytetrafluoroethylene

• Porcelain

• Pottery

• Polypropylene

• Polyvinylidene Flouride