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Science Year 9 > Chemical Change > Flashcards

Chemical Change Flashcards

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1
Q

what charge is the necleus

A

positive

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2
Q

what charge is electrons

A

negative (-1)

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3
Q

what charge is an atom

A

no overall charge

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4
Q

ion

A

an atom that looses or gains electrons

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5
Q

metallic bonding

A

the force of attraction between free-moving electrons and positive metal ions

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6
Q

what charge is neutrons

A

neutral charge (0)

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7
Q

what charge is protons

A

positive (+1)

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8
Q

ionic bond

A

force of attraction between oppositely charged ions in a chemical compound

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9
Q

ionic compound

A

a compound held together by a iconic bond

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10
Q

exothermic reaction

A

energy is transferred to the surroundings

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11
Q

endothermic reaction

A

energy is taken in from the surroundings

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12
Q

rate of reaction

A

how quickly a reaction takes place

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13
Q

calculation to work out mean rate of reaction

A

mean rate of reaction = overall change in a value (eg. product formed or reactants used up) / total time taken for the reaction

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14
Q

a salt is produced in what reaction? (2 answers)

A

a neutralisation reaction (alkali reacting with an acid) or a metal reacting with an acid

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15
Q

what state symbol is used to show a solid

A

s

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16
Q

what state symbol is used to show a liquid

A

l

17
Q

what state symbol is used to show a gas

A

g

18
Q

what state symbol is used to show something that is ‘aqueous’ (dissolved in water)

A

aq

19
Q

decomposition reaction

A

the process or effect of simplifying a single chemical entity into two or more fragments

20
Q

reversible reaction

A

a reaction that can go both backwards and forwards (can be reversed)

21
Q

equilibrium

A

state in which both the reactants and products are present in concentrations which have no further tendency to change with time

22
Q

dynamic equilibrium

A

when the forward and reverse processes occur at the same rate and is undergoing constant change, resulting in no observable change in the system

Science Year 9 (5 decks)

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