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BMAT Rafa > C6 - Chemical change > Flashcards

C6 - Chemical change Flashcards

1
Q

Alkali

A

Base that dissolves in water

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2
Q

Strong acids are..

A

Better electrical conductors than weak acids

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3
Q

metal+acid=

A

salt+hydrogen

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4
Q

acid + metal oxide=

A

salt + water

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5
Q

Common salts soluble?

A

Yes

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6
Q

Nitrates soluble?

A

Yes

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7
Q

Common chlorides soluble?

A

Yes (apart from silver chloride and lead chloride)

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8
Q

Common sulfates soluble?

A

Yes (exempt lead, barium and calcium sulfate )

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9
Q

Common carbonates and hydroxides soluble?

A

No (expet for sodium, potassium and ammonium ones)

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10
Q

Making insoluble salts

A

Precipitation reaction with two soluble salts

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11
Q

Making soluble salts using an acid and an insoluble reactant

A

acid plus metal or insoluble base

Heat gently to evaporate water and crystallise the salt

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12
Q

Making soluble salts using an acid and a soluble reactant

A

acid and exactly the right amount of alkali (soluble base)
eg sodium, potassium or ammonium hydroxides
(can’t tell when finished)
carry out titration to find exact volume

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13
Q

Examples of redox reactions

A

Chlorine gas and iron(II) salt (green to yellow as iron oxidised, chlorine oxidising agent, chlorine reduced)
Iron and dilute acid (iron oxidised to iron2+ and hydrogen reduced)

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14
Q

When do metals rust?

A

iron is in contact with both oxygen and water

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15
Q

What is rust a form of?

A

hydrated iron (III) oxide

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16
Q

Equation for rust

A

iron + oxygen + water = hydrated iron (III) oxide

17
Q

Why is rusting a redox reaction?

A

iron loses three electrons

each oxygen gains 2 electrons

18
Q

How to prevent rusting?

A

Metals are combined with other things
oil grease and paint
coat of tin prevents steel from rust
more reactive metals prevent iron from rusting (not displacement)

19
Q

Stainless steel

A

iron carbon and chromium

20
Q

What is galvanising?

A

Coat of zinc onto the object, more reactive and so lose electrons in preference to iron

BMAT Rafa (19 decks)

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