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Chemistry > Chemical Changes > Flashcards

Chemical Changes Flashcards

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1
Q

Give an example of a pH 1 substance

A

Battery acid

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2
Q

Give an example of a neutral substance

A

PURE water

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3
Q

Give an example of a pH 3 substance

A

Lemon Juice

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4
Q

Give an example of weak alkaline solution

A

Soap powder

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5
Q

Give an example of a strong alkaline solution

A

Drain cleaner

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6
Q

Give an example of an electrical pH measurer

A

pH meter

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7
Q

What are two good indicators to use for finding a specific pH of a solution?

A

Phenolphthalein- goes colourless pink in alkalis

Methyl orange- red in acids, yellow in alkalis

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8
Q

Give other examples of indicators

A

Universal indicator

Litmus paper

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9
Q

What is a base?

A

Any substance that can react with an acid to form a salt?

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10
Q

What apparatus do you use to carry out titration?

A

Pipette
Burette
Conical flask
Acids

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11
Q

What do acids in water produce?

A

Protons

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12
Q

Why do strong acids like hydrochloric acid dissolve fully in water?

A

The acid particles dissociate to release H+ ions

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13
Q

Why do weak acids not dissolve fully in water

A

Not many of the acid particles dissociate so not as many H+ ions are released

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14
Q

If there is a weak acid what can you say about where there will be a more concentrated side of the equilibria equation?

A

It will shift heavily on the left

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15
Q

When asked about acid pH changing in reactions how do you work out the concentration of the acid change?

A

Find the change of pH

Times the answer by 10 to the power of (the difference in pH)

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16
Q

Give examples of bases

A

A metal hydroxide

Metal Oxide

17
Q

What do acids and metal carbonates produce?

A

Salt + water + carbon dioxide

18
Q 
List the reactivity series using these metals:
Lithium
Potassium
Sodium
Copper
Zinc
Iron
Hydrogen
Carbon
 calcium 
magnesium
A 
Potassium
Sodium
Lithium
Calcium
Magnesium
Carbon
Zinc
Iron
Hydrogen
Copper
19
Q

Acid + Metal =?

A

Acid + Metal = Salt + hydrogen

20
Q

Metal + water –> ?

A

Metal + water –> Metal hydroxide + hydrogen

21
Q

What is a redox reaction?

A

Where electrons are transferred

22
Q

Why does the anode always need replacing often

A

It’s made of carbon so reacts with oxygen forming CO2

Chemistry (5 decks)

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