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chemistry > 20 questions-chemical changes > Flashcards

20 questions-chemical changes Flashcards

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1
Q

where in the reactivity series will you find copper

A

the bottom

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2
Q

which 2 nonmetals are found in the reactivity series

A

hydrogen and carbon

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3
Q

write a word for oxidation if magnesium to form magnesium oxide

A

magnesium + oxygen -> magnesium oxide

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4
Q

calcium is in group 2 of the periodic table ,what charge will be on a calcium ion

A

+2 since it loses 2 electrons

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5
Q

what ion is produced by acids

A

H+ (hydrogen ions)

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6
Q

whats the ph of a neutral solution

A

7

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7
Q

true of false,alkalis have a ph of more than 7

A

true

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8
Q

when an acid reacts with a metal which gas is produced

A

hydrogen

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9
Q

which acid has the formula h2s04

A

sulfuric acid

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10
Q

what ion is produced by all alkalis

A

OH-

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11
Q

whats a strong acid

A

an acid thats fully ionised in water

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12
Q

the ph of solution changes from 6 to 4 what happens to the concentration of hydrogen ions

A

decreases by 10

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13
Q

define oxidation in terms of electrons

A

the loss of electrons

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14
Q

define reduction in terms of electrons

A

the gain of electrons

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15
Q

Ca → Ca2+ + 2e-​

2H+ + 2e- → H2​, which is oxidised

A

calcium since it looses electrons in the reaction

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16
Q

Ca → Ca2+ + 2e-​

2H+ + 2e- → H2​ which is reduced

A

hydrogen since it gains electrons

17
Q

whats the general ionic equation for neutralisation

A

H+ OH- -> H20

18
Q

what do we call the molten ionic compound used in electrolysis

A

electrolyte

19
Q

whatre the products of the electrolysis of the aqueous solution of sodium bromide

A

hydrogen and bromine

20
Q

whatre the half equations for reactions that takke place at each electrode in the electrolysis of aq sodium bromide

A

At the cathode: 2H+ + 2e- → H2​

      At the anode:  2Br- →  Br2​

chemistry (16 decks)

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