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3.1. Formulae
A subsection of Chemistry, 0620, through 3. Stoichiometry
Listing 10 of 91 questions
A list of symbols and formulae is shown. Br2 CH4 C2H4 Cl – CO2 Cr3+ Cu2+ H2 K+ N2 N3– O2 SO4 2– Answer the following questions about these symbols and formulae. Each symbol or formula may be used once, more than once or not at all. State which symbol or formula represents: a molecule containing only five atoms a diatomic molecule of an element in Group VII of the Periodic Table an ion formed when an atom gains one electron an ion which forms a green precipitate when a few drops of aqueous sodium hydroxide are added to it a compound produced by the thermal decomposition of calcium carbonate a product of photosynthesis. 
0620_m23_qp_32
THEORY
2023
Paper 3, Variant 2
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Questions Discovered
91