Calderglen High School Bonding - Properties N4 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 Calderglen High School

1. What is an electric current ? answer A flow of electrons Calderglen High School

2. What is an electrical CONDUCTOR ? answer A substance that allows electricity to pass through it Calderglen High School

3. What is an electrical INSULATOR ? answer A substance that does NOT allow electricity to pass through it Calderglen High School

4. What types of substances conduct electricity ? answer Metals Graphite (form of carbon) Molten ionic compounds Ionic solutions Calderglen High School

5. What types of substances do NOT conduct electricity ? answer Non – metals (except carbon Graphite) Solid ionic compounds Covalent compounds Calderglen High School

Yes Yes No Yes Yes No No No No No 6. Complete the table? answer Structure Melting point Conductivity Solid Liquid Solution Metallic High N/A Ionic Covalent molecular Low Covalent network Very High Yes Yes No Yes Yes No No No No No Calderglen High School

Calderglen High School 7. Fill in the typical melting points for these structures. (i.e. high, low, v. high etc) answer Structure Melting point Conductivity Solid Liquid Solution Metallic Yes N/A Ionic No Covalent molecular Covalent network High Low Very High Calderglen High School

Covalent Network Ionic Covalent Molecule Metallic 8. Fill in the blanks to suggest structures. (e.g. Ionic, Covalent molecular, Metallic, Covalent network) answer Structure Melting point Conductivity Solid Liquid Solution Very High No N/A High Yes Low Covalent Network Ionic Covalent Molecule Metallic Calderglen High School

Magnesium + Oxygen  Magnesium oxide 9. Write a word equation for: Magnesium burns in oxygen to form magnesium oxide? answer Magnesium + Oxygen  Magnesium oxide Calderglen High School

10. Why do ionic solids NOT conduct electricity ? answer The ions are not free to move Calderglen High School

11. What type of structure is shown? answer C O C O C O C O C O Covalent molecular e.g. carbon dioxide (CO2) Calderglen High School

12. Describe the structure of an IONIC solid answer Positive and negative ions in a lattice Calderglen High School

13. Why do ionic compounds conduct when liquid or solution but not when solid? answer Ions are FREE TO MOVE when a liquid or solution. Ions cannot move in a solid. Calderglen High School

Calderglen High School 14. Write a chemical equation for: Calcium + Water  Calcium + Hydrogen hydroxide answer Ca + H2O  CaOH + H2 Calderglen High School

15.Do covalent compounds conduct electricity? answer NO! Calderglen High School

16. What type of structure is shown? Image: BBC website answer IONIC LATTICE e.g. Sodium chloride (metal / non metal compound) Calderglen High School

17. What type of structure is shown? Image: BBC website answer Metallic e.g. Sodium, iron, copper…(any metal) Calderglen High School