Exam (elaborations)
EDEXCEL A LEVEL CHEMISTRY PAPER 2 EXAM QUESTIONS AND ANSWERS 2024 Review
- Module
- Edexcel A-Level Chemistry
- Institution
- Edexcel A-Level Chemistry
EDEXCEL A LEVEL CHEMISTRY PAPER 2 EXAM QUESTIONS AND ANSWERS 2024 Review
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EDEXCEL A LEVEL CHEMISTRY PAPER2 EXAM QUESTIONS AND ANSWERS
2024 Review
Proton c/m? - Answer>>+1, 1
Neutron c/m? - Answer>>0, 1
Electron c/m? - Answer>>-1, 1/1500
Mass number? - Answer>>Num of protons + neutrons
Atomic number? - Answer>>Num protons
Isotope? - Answer>>Different atom of the same element, same
num protons.
Diff number neutrons.
Mendeleev vs Now? - Answer>>Mendeleev: Gaps for elements,
No noble gases, fewer elements.
Both had metals and non-metals.
Both had groups/periods
Periods? - Answer>>Rows, Increasing atomic mass.
Period num = num shells.
Groups? - Answer>>Elements similar properties.
Same num outer electrons.
Ion? - Answer>>An atom with a positive or negative charge
Ionic compound structure? - Answer>>Lattice.
Regular arrangement ions.
Held by ionic bonds between oppositely charged ions.
, Covalent bond? - Answer>>Pair of electrons shared between 2
atoms
Ionic? - Answer>>Compound composed of ions
Simple molecular (covalent)? - Answer>>Atoms joined by
covalent bonds
Ionic properties? - Answer>>High MP + BP - strong forces
between opp ions. Only conduct when molten or dissolved.
Covalent properties? - Answer>>Low MP + BP - weak
intermolecular forces.
Poor conductors.
Diamond? - Answer>>Each carbon atom, 4 strong covalent
bonds = High MP.
Rigid lattice structure makes diamond hard.
Doesn't conduct, no free electrons.
Graphite? - Answer>>Each atom, 3 covalent bonds = strong
High MB + BP
No bonds between layers, move over each other.
Each atom, has one delocalised electron - conducts electricity.
Fullerenes? - Answer>>Molecules of carbon, arranged in
hexagons.
Used cage other molecules, deliver drugs.
Huge SA.
Graphene? - Answer>>Fullerene.
Sheet of carbon atoms joined together in hexagons.
1 sheet thick.
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