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Mark scheme for my teachers chemistry paper ( written by me)

Q1. A. Isotope= atoms of the same element with a different number of neutrons

b. requires you to complete this table

c. Carbon 12 (1)

e. Emperical formula :simplest whole ratio of atoms in a molecule (1)

Q2. A.…

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b. Silicon has a giant covalent structure which is strong, as giant covalent bonds have to broken which requires
much energy. However, Sulphur has a simple molecular structure with simple van der waals forces between
molecules which are weaker than covalent bonds, so little energy is required to break…

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c. aluminium ion has a greater charge density than sodium ion. the metallic bond in alumium is stronger because there
is a stronger force of attraction between the Al3+ and the delocalised electrons than between Na+ and the
delocalised electrons. ( 2 marks)

Using oil rig : In MnO2 the…

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1 mark label axes, 1 mark correct arrows in correct places

d. First ionisation energy : energy required to remove 1 electron from each atom in 1 mole of electrons to form 1
mole of gaseous 1+ ions.

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State symbols and correct equation = 2 marks

iii. there is a leap between the 6th and 7th ionisation energies showing start of a new shell . There is more nuclear
attraction and less shielding means it requires more energy to remove the electron) 2 marks

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2 max

d. I pyramidal (1)

ii. 3 bond pairs , 1 lone pair, the lone pair repels slightly more than the bond pairs which results in the angle of 107
degrees( 3)

Q7. A. I because they have different numbers of protons in the nucleus

ii. the…

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Good conductor because : there are free delocalised electrons between the layers which can move. Covalent
bonding exists between atoms in the layers.

High melt+boil point : because strong covalent bonds must be broken, which requires a lot of energy

Insoluble in water : non polar so not soluble



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