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Chemistry > SC8 > Flashcards

SC8 Flashcards

1
Q

What colour does litmus paper turn in an alkaline solution

A

blue

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2
Q

What colour does litmus paper turn in an acidic solution

A

red

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3
Q

What colour does methyl orange turn in an alkaline solution

A

yellow

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4
Q

What colour does methyl orange turn in an acidic solution

A

red

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5
Q

What colour does phenolphthalein turn in an alkaline solution

A

pink

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6
Q

What colour does phenolphthalein turn in an acidic solution

A

colourless

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7
Q

Name all the types of indicators

A

-universal indicator
-litmus paper
-methyl orange
-phenolphthalein

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8
Q

What are polyatomic ions

A

formed when small groups of atoms held together by covalent bonds lose/gain electrons

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9
Q

Give some examples of polyatomic ions

A

OH-, NO3-

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10
Q

What do acids produce an excess of when dissolved in water

A

hydrogen ions

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11
Q

what does a higher number of hydrogen ions in a certain volume mean

A

higher concentration of hydrogen ions

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12
Q

what does a higher concentration of hydrogen ions mean

A

more acidic/lower PH

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13
Q

What does a higher concentration of hydroxide ions mean

A

more alkaline/higher PH

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14
Q

Describe a concentrated solution

A

lots of dissolved solute per unit volume

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15
Q

Describe a dilute solution

A

only small amount of solute

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16
Q

If the concentration of hydrogen ions increases by a factor of 10 what will happen to the pH

A

decrease by one

17
Q

Define a strong acid

A

dissociate completely into ions in water, produce high conc of hydrogen ions

18
Q

Define a weak acid

A

don’t fully dissociate into ions in water, not many hydrogen ions

19
Q

What type of reaction is the ionisation of a weak acid?

A

reversible reaction

20
Q

What is a base?

A

substance that reacts with an acid to produce a salt and water

21
Q

What is an alkali?

A

base thats soluble in water

22
Q

Word equation of metal oxide and acid

A

metal oxide+acid=salt+water

23
Q

How is water formed from a metal oxide and acid?

A

H ions combine with oxide ions

24
Q

How is a salt produced from a metal oxide and acid?

A

metal ions replace H ions

Chemistry (26 decks)

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