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Chemistry mistakes > C1 2018 > Flashcards

C1 2018 Flashcards

1
Q

4b Explain why the second ionisation energy of calcium is lower than the second ionisation energy of potassium

A

K ions has lower shielding than Ca ions
In K ions, electrons are closer from the nucleus

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2
Q

4d Give the formula of the hydroxide of the element in Group 2 from Mg to Ba that is least soluble in water

A

Mg(OH)2

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3
Q

4e Give an ionic equation between Barium chloride and sodium sulfate

A

Ba2+ + SO42- -> BaSO4

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4
Q

9d Heating NH4VO3 produces vanadium oxide, water and one other product. Give an equation for this reaction

A

2NH4VO3 -> V2O5 + H2O + 2NH3

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5
Q

9e Vanadium oxide is the catalyst used in the manufacture of sulfur trioxide. Give two equations to show how the catalyst is used and regenerated

A

V2O5 + SO2 -> SO3 + V2O4
V2O4 + 1/2O2 -> V2O5

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Chemistry mistakes (33 decks)

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