6. Polymers made from different monomers have different properties. Explain why.
Different monomers change the structure of the polymer chains because polymer chains are different shapes and sizes
different monomers change the structure of the polymer chains because polymer chains all are the same shape and size.
The same monomers change the structure different monomers change the structure of the polymer chains.
7. Why does it take a lot of energy to melt sodium chloride?
It is a giant ionic structure with strong electrostatic forces which means more energy is needed to break up these forces
It is a giant ionic structure with weak electrostatic forces which means less energy is needed to break up these forces
It is a giant covalent structure with strong electrostatic forces which means more enrgy is needed to break up these forces
8. Explain what is meant by intermolecular forces.
The forces between molecules.
The forces inside the molecule.
9. What is a fullerene?
Forms of carbon, with large molecules with hexagon cage like structures.
A type of element used to give a molecule strong forces.
A chemical used to transfer drugs into the body,
10. Explain how the atoms in a metal are bonded together.
The outer electrons delocalise leaving a lattice of positive ions. The delocalised electrons strongly attract the positive ions and hold them in position.
The outer electrons delocalise leaving a lattice of positive ions. The delocalised electrons strongly attract the negative ions and hold them in position.
11. Explain why a block of copper can be hammered into a sheet.
Copper breaks when a force is applied.
The atoms are in layers and these layers can slide over each other into the new shape.
Because copper isn't very strong.
12. Explain why diamonds are very hard.
Every carbon atom is covalently bonded to 3 other carbon atoms in its structure.
Every carbon atom is covalently bonded to 4 other carbon atoms in its structure.
Every carbon atom is ionic bonded to 4 other carbon atoms in its structure.
13. Why do ionic compounds need to be molten or in solution to conduct electricity?
The ions cannot move in the solid, but become free to move in the molten liquid/ solution.
The ions cannot move in a Liquid, but become free in to move in solid.
14. Explain why thermosetting polymers are used to make handles for cooking pans.
They do not soften when they get hot. Good insulators of hot. Can be molded into shapes then become rigid when cooled.
