atoms and reactions 2

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what colour is methyl orange in acid , base nd at the end point?
acid = red base = yellow end point=orange
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what colour is phenolphthalein in acid , base nd at the end point?
colour in acid = coluourless base =pink end point= pale pink/ colourless
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when using phenolphthalein what order do you add the solutions for the end point to be colourless?
acid is added to base
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what is an oxidation number ?
a measure of the number of electrons being used to bond with atoms of another element
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what is the oxidation number of an uncombined element ?
0
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what does uncombined mean?
is not in a compound
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what is the oxidation number of combined flourine ?
-1
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what are the exeptions of the oxidation number rules?
oxygen+fluorine Oxygen has +2 , oxygen+peroxides Oxygen has -1 , metals+hydrogen Hydrogen = -1
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what are oxyanions?
negative ions that contain an element along with oxygen
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what is oxidation?
loss of electrons or increase in oxidation number
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what is reduction?
a gain of electrons or decrease in oxidation numbers
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define a redox reaction
a reaction in which both reduction and oxidation take place
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Card 2

Front

what colour is phenolphthalein in acid , base nd at the end point?

Back

colour in acid = coluourless base =pink end point= pale pink/ colourless

Card 3

Front

when using phenolphthalein what order do you add the solutions for the end point to be colourless?

Back

Preview of the front of card 3

Card 4

Front

what is an oxidation number ?

Back

Preview of the front of card 4

Card 5

Front

what is the oxidation number of an uncombined element ?

Back

Preview of the front of card 5
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