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GCSE Chemistry > Chemical Reactions > Flashcards

Chemical Reactions Flashcards

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1
Q

Acids consist of what ions?

A

H+ ions.

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2
Q

Alkalis consist of what ions?

A

OH- ions.

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3
Q

What is the pH scale?

A

A scale of acidity / alkali. The lower the pH the more acidic it is and the higher it is, the more alkali it contains.

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4
Q

What does 7 mean on the pH scale?

A

That the substance is neutral and it’s probably water.

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5
Q

What colour does litmus paper turn when exposed to an an acid?

A

Red.

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6
Q

What colour does litmus paper turn when exposed to an an alkali?

A

Blue.

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7
Q

Phenolphthalein only turns pink when exposed to alkali, what colour is it when it’s not an alkali?

A

It’s colourless.

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8
Q

When an acid reacts with something, what does it produce?

A

A salt.

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9
Q

Finish this equation.

Acid + metal –> _____ + _____

A

Acid + metal –> salt + hydrogen

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10
Q

What is a base?

A

A substance that reacts with an acid to produce salt and neutralise the acid.

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11
Q

Finish this equation.

Acid + metal oxide –> _____ + _____

A

Finish this equation.

Acid + metal oxide –> salt + water

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12
Q

Finish this equation.

Acid + metal carbonate –> _____ + _____

A

Finish this equation.

Acid + carbonate –> salt + water + carbon dioxide

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13
Q

Whats the chemical test for carbon dioxide?

A

Put the gas into limewater. If the water turns cloudy, then it will contain carbon dioxide.

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14
Q

If a base is soluble in water, then what is it?

A

It will be an alkali.

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15
Q

How do we work out the pH of a substance from the amount of ions?

A

If the amount of ions increase or decrease by a factor of 10, then the pH will increase or decrease by 1.

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16
Q

What is the complex ion for ammonium?

A

NH₄⁺

17
Q

What is the complex ion for nitrate?

A

NO₃-

18
Q

What is the complex ion for sulfate?

A

SO4²⁻

19
Q

Finish this equation.

Acid + metal hydroxide –> _____ + _____

A

Acid + metal hydroxide –> salt + water

GCSE Chemistry (3 decks)

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