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Chemistry > 4.chemical changes > Flashcards

4.chemical changes Flashcards

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1
Q

what is the pH scale?

A

a measure of how acidic or alkaline a solution is that goes from 0-14

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2
Q

a solution with a pH of 7 is…

A

neutral

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3
Q

anything that forms a solution with a pH if less than 7 is an…

A

acid.Lower the pH,more acidic the solution

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4
Q

anything that forms a solution with a pH of greater than 7 is an

A

alkali.The higher the pH,the more alkaline a substance is

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5
Q

what is happens when a metal reacts with oxygen?

A

metal oxide is formed and an oxidation reaction takes place so the metal atoms have been oxidised

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6
Q

what is gaining oxygen called?

A

an oxidisation reaction

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7
Q

what is losing oxygen called?

A

reduction reaction

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8
Q

reaction between calcium and copper oxide

A

calcium+copper oxide —>calcium oxide+copper

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9
Q

in the reaction between calcium and copper oxide,which atoms are oxidised and which are reduced?

A

the products of the reaction are calcium oxide and copper which means the calcium has gained oxygen(so oxidised) and the copper loses oxygen(so reduced)

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10
Q

reaction of potassium and water

A

-forms potassium hydroxide and hydrogen
-vigorous reaction

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11
Q

how does potassium ,sodium and lithium react with water?

A

react very rapidly with water at room temperature

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12
Q

how does calcium react with water at room temperature?

A

reacts quite rapidly with water at room temperature

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13
Q

how does magnesium,zinc,iron and copper react with water at room temperature?

A

no reaction

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14
Q

how does potassium,sodium and lithium react with dilute acid?

A

dangerously fast reaction with acids

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15
Q

how does calcium react with dilute acid?

A

extremely vigorous reaction

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16
Q

how does magnesium react with dilute acid?

A

rapid reaction

17
Q

how does zinc react with dilute acid?

A

quite rapid reaction

18
Q

how quickly does iron react with dilute acid?

A

quite slow reaction

19
Q

how does copper react with dilute acid?

A

no reaction

20
Q

what determines how rapidly a metal reacts?

A

when metals react,they lose electrons and form positive ions.The higher up the reactivity series a metal is,the more easily it will form positive ions

Chemistry (11 decks)

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