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AS level OCR Chemistry Questions & 100% correct Answers- Latest Test | Graded A+ | Passed
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Isotopes Ξ -:- Different atomic forms of the same element. Atoms with the same number of protons but a different number of neutrons Relative atomic mass Ξ -:- The mean mass of an atom of an element, compared to 1/12th of the mass of an atom of carbon-12 Concentration= Ξ -:- Number of mo...

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  • August 26, 2024
  • 17
  • 2024/2025
  • Exam (elaborations)
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E x c e l l e n c e i s k e y | 2 0 2 0 2 5 ~ P a g e |1




AS level OCR Chemistry Questions &
100% correct Answers- Latest Test |
Graded A+ | Passed
Isotopes

Ξ -:- Different atomic forms of the same element. Atoms with the same number of

protons but a different number of neutrons



Relative atomic mass

Ξ -:- The mean mass of an atom of an element, compared to 1/12th of the mass of an

atom of carbon-12



Concentration=

Ξ -:- Number of moles ÷ Volume



One mole

Ξ -:- 6.02×10^23



Number of moles=

Ξ -:- mass ÷ molar mass



r.t.p

Ξ -:- 25 ºC

100 kPa (1 atm)



Molar gas volume

Ξ -:- 24 dm³ / mol

One mole of any gas always has the same volume at r.t.p



26/08/2024 | © Copyright- This work may not be copied for profit.

, E x c e l l e n c e i s k e y | 2 0 2 0 2 5 ~ P a g e |2




Number of moles=

Ξ -:- Volume (dm^3) ÷ Molar gas volume (24 dm^3 / mol)



R- Gas constant

Ξ -:- 8.314 J / K / mol



Gas equation

Ξ -:- pV = nRT

(Pa)(m³)(K)

Assumes forces between molecules are negligible and the molecules have a negligible size



Empirical formula

Ξ -:- The smallest whole number ratio of atoms of each element in a compound



Molecular formula

Ξ -:- The actual number of atoms of each element in a compound



Ions:

Nitrate

Carbonate

Sulfate

Hydroxide

Ammonium

Zinc ion

Silver ion

Ξ -:- Formula:

NO3-

CO3²-

SO4²-


26/08/2024 | © Copyright- This work may not be copied for profit.

, E x c e l l e n c e i s k e y | 2 0 2 0 2 5 ~ P a g e |3


OH-

NH4+

Zn²+

Ag+



Acids

Ξ -:- Proton donors - produce H+ ions in water



Alkalis

Ξ -:- Proton acceptors - produce OH- ions in water



Acid + Base=

Metal oxide + Acid=

Metal hydroxide + Acid=

Ξ -:- Salt + Water



Metal + Acid=

Ξ -:- Metal salt + Hydrogen



Metal carbonate + Acid=

Ξ -:- Metal salt + Carbon dioxide + Water



Ammonia + Acid=

Ξ -:- Ammonium salt



Methyl orange

Ξ -:- Yellow in alkali, red in acids



Phenolphthalein




26/08/2024 | © Copyright- This work may not be copied for profit.

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