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OCR A A-Level Chemistry- Physical and inorganic (Paper 1) Questions & 100% Correct Answers- Latest Test | Graded A+ | Passed
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Isotopes ֎ -:- Atoms of the same elements with different numbers of neutrons and different masses Why do isotopes of the same element have the same chemical properties? ֎ -:- Same number of electrons, number of neutrons has no effect on reactions of an element Relative isotopic mass ֎ -...

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  • August 27, 2024
  • 36
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • ocr a a level chemistry physical and inorganic

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Excellence is key | 2024/2025 ~Page |1



OCR A A-Level Chemistry- Physical and
inorganic (Paper 1) Questions & 100%
Correct Answers- Latest Test | Graded A+
| Passed
Isotopes


֎ -:- Atoms of the same elements with different numbers of neutrons and

different masses




Why do isotopes of the same element have the same chemical properties?


֎ -:- Same number of electrons, number of neutrons has no effect on reactions

of an element




Relative isotopic mass


֎ -:- Mass of an isotope relative to 1/12th of the mass of an atom of carbon-12




Relative atomic mass


֎ -:- The weighted mean mass of an atom of an element compared with 1/12th

of the mass of an atom of carbon-12.




Empirical formula




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

, Excellence is key | 2024/2025 ~Page |2


֎ -:- The simplest whole number ratio of atoms of each elements in a

compound




Molecular formula


֎ -:- The number and type of atoms of each element in a molecule




Hydrated crystal


֎ -:- Water molecules part of its crystalline structure




Anhydrous crystal


֎ -:- Water molecules not part of its crystalline structure




Assumptions of water of crystallisation experimental formulae


֎ -:- All the water has been lost and no further decomposition




Standard solutioin


֎ -:- Solution of known concentration




Molar gas volume




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

, Excellence is key | 2024/2025 ~Page |3


֎ -:- The volume per mole of gas molecules at a stated temperature and

pressure




Benefits of high atom economy


֎ -:- Makes industrial processes more efficient, preserves raw materials and

reduces waste




Strong acid


֎ -:- An acid that completely dissociates in solution




Weak acid


֎ -:- An acid that only partially dissociates in solution




Base


֎ -:- A substance that neutralises an acid to form a salt




Alkali


֎ -:- A base that dissolves in water forming OH- ions




Oxidation number of H in metal hydrides




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

, Excellence is key | 2024/2025 ~Page |4


֎ -:- -1




Oxidation number of O in peroxides


֎ -:- -1




Oxidation number of O bonded to F


֎ -:- +2




Oxidation in terms of electrons


֎ -:- Loss of electrons




Oxidation in terms of oxidation number


֎ -:- increase in oxidation number




Reduction in terms of electrons


֎ -:- gain of electrons




Reduction in terms of oxidation number


֎ -:- decrease in oxidation number




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

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