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C2 CovalentMetallic

Edexcel C2 Covalent and Metallic bonding and properties

QuestionAnswer
How do you know that CO2 is a covalent compound? Both C and O are non-metals
What is covalent bonding? SHARING of PAIR of electrons (two keywords to remember!)
How to you draw a dot and cross diagram? Overlap circles; in the middle place a dot and a cross; check the group number
What is special about the dot and cross diagram of CO2? There are TWO dots and TWO crosses (ie TWO pairs of electrons) in each overlap
State 3 properties of simple covalent compounds Low melting point; do not conduct electricity;do not dissolve
Explain why simple covalent compounds have low melting point There are weak forces BETWEEN MOLECULES
Explain why simple covalent compounds do not conduct electricity There are no CHARGES (like electrons) able to MOVE (because they are shared/stuck in the middle)
Name the two forms of Carbon Diamond and Graphite
State the difference in properties between Diamond and Graphie Diamond is very hard; Graphite is very soft and comes in layers
describe the structure of Graphite Each atom of Carbon is linked to 3 other Carbons; the Carbons form sheets/layers that are loosely bonded
Describe the structure of Diamond Each Carbon atom is bonded to 4 other Carbon; the Carbons form a 3D network
Describe metallic structure A lattice of FIXED positive ions surrounded by a SEA of DELOCALISED electrons
State 3 properties of metallic structure Conduct electricity; High melting point
Explain why metallic structures conduct electricity There are CHARGED particles (delocalised electrons) that are able to to MOVE
A chemical conduct electricity when molten but not as a solid: what type of structure? Ionic structure
A chemical does not conduct electricity and has a low melting point. What type of structure? Simple Covalent
A chemical does not conduct electricity and has a high melting point. What type of structure? Giant Covalent
A chemical conducts electricity when liquid and solid and has a high melting point. What type of structure? Metallic
Explain why Graphite conducts electricity Each Carbon is linked to 3 other Carbons; so each Carbon has a spare electron; all the spares electrons are DELOCALISED (do not stay on one carbon; are shared with all the atoms); electrons can move BETWEEN LAYERS
Explain why Diamond does not conduct electricity Each Carbon is linked to 4 other Carbon atoms; there is no spare electron; there are no charges able to move
Explain why graphite has a high melting point Because there are MANY strong COVALENT bondbetween ATOMS to break and this requires a lot of energy to break; remember to clearly write WHICH PARTICLES
Explain why Iron has a high melting point Because there are strong forces of attraction between positive IONS and delocalised ELECTRONS and this requires a lot of energy to break; remember to clearly write WHICH PARTICLES
Explain why sodium chloride has a high melting point Because there are strong ELECTROSTATIC forces between IONS and this requires a lot of energy to break; remember to clearly write WHICH PARTICLES
Explain why Methane has a low melting point Because there are weak bondbetween MOLECULES and this requires a lot of energy to break; remember to clearly write WHICH PARTICLES
Describe how to draw the dot and cross diagram for CCl4 Draw one circle for the Carbon atom; overlap FOUR circles (one for each chlorine atom) with the carbon; dot and cross in middle; add remaining 6 electrons on the Chlorine circles
Describe how to draw the dot and cross diagram for NH3 Draw one circle for the Nitrogen Atom; overlap 3 circles (One for each Hydrogen) with the Nitrogen; dot and cross in the middle; add remaining two electrons on the nitrogen circle
Why does Sodium Chloride conduct electricity when molten CHARGED ions can MOVE; did you get the correct particle (Ie ION)?
Why is graphite soft? Because there are weak forces between layers
Created by: UrsulineChem