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Chemistry core edexcel > C1.3 Acids > Flashcards

C1.3 Acids Flashcards

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1
Q

Why does the stomach produce hydrochloric acid?

A
  • to help digestion

- to kill bacteria

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2
Q

What causes indigestion?

A

Excessive stomach acid

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3
Q

What type of medicines treat indigestion?

A

Antacids

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4
Q

What is a base dissolved in water?

A

An alkali

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5
Q

How do antacids treat indigestion?

A

By neutralising excess stomach acid

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6
Q

What types of bases neutralise acid?

A
  • metal oxides
  • metal hydroxides
  • metal carbonates
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7
Q

What pH does a neutral liquid have?

A

pH 7

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8
Q

What is a substance with a pH of 0?

A

An acid

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9
Q

What is a substance with a pH of 14?

A

An alkali

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10
Q

What colour does damp blue litmus paper turn under acidic conditions?

A

Red

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11
Q

What colour does damp red litmus paper turn under alkaline conditions?

A

Blue

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12
Q

How can you find out if a substance is an acid or an alkali?

A

By using an indicator

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13
Q

What does an acid + a metal hydroxide produce?

A

A salt + water

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14
Q

What does an acid + a metal carbonate produce?

A

A salt + water + carbon dioxide

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15
Q

What does an acid + a metal oxide produce?

A

A salt + water

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16
Q

What is electrolysis?

A

The process of decomposing compounds using a d.c. current

17
Q

What is the test for chlorine gas?

A

Seeing if it bleaches damp blue litmus paper red and then white

18
Q

What is the test for hydrogen gas?

A

Seeing if a lighted splint explodes with a squeaky pop

19
Q

What are the uses of chlorine?

A
  • treatment of water supplies
  • the manufacture of bleach and other cleaning products
  • the manufacture of plastics like PVC
20
Q

What are the hazards of producing chlorine on a large scale?

A

If there is a leak near a town many people could die

21
Q

Why is chlorine hazardous?

A

It is a toxic gas

22
Q

What does the electrolysis of sea water produce?

A

Hydrogen and chlorine gas

23
Q

What does the electrolysis of water produce?

A

Hydrogen and oxygen gas

24
Q

What is the test for oxygen?

A

Seeing if it relights a glowing splint

Chemistry core edexcel (5 decks)

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