atoms and reactions 2 3.0 / 5 based on 1 rating ? ChemistryBonding & shapesReactionsASOCR Created by: rayanne vitaliCreated on: 25-10-12 21:32 what colour is methyl orange in acid , base nd at the end point? acid = red base = yellow end point=orange 1 of 12 what colour is phenolphthalein in acid , base nd at the end point? colour in acid = coluourless base =pink end point= pale pink/ colourless 2 of 12 when using phenolphthalein what order do you add the solutions for the end point to be colourless? acid is added to base 3 of 12 what is an oxidation number ? a measure of the number of electrons being used to bond with atoms of another element 4 of 12 what is the oxidation number of an uncombined element ? 0 5 of 12 what does uncombined mean? is not in a compound 6 of 12 what is the oxidation number of combined flourine ? -1 7 of 12 what are the exeptions of the oxidation number rules? oxygen+fluorine Oxygen has +2 , oxygen+peroxides Oxygen has -1 , metals+hydrogen Hydrogen = -1 8 of 12 what are oxyanions? negative ions that contain an element along with oxygen 9 of 12 what is oxidation? loss of electrons or increase in oxidation number 10 of 12 what is reduction? a gain of electrons or decrease in oxidation numbers 11 of 12 define a redox reaction a reaction in which both reduction and oxidation take place 12 of 12
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