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OCR A A level Chemistry > 3.1 > Flashcards

3.1 Flashcards

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1
Q

Test for Ammonium reagent?

A

NaOH

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2
Q

Equation for ammonium and sodium hydroxide?

A
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3
Q

Colour change when testing for Ammonium?

A

Use damp litmus paper- red to blue

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4
Q

Test for Sulfate reagent?

A

BaCl or other SOLUBLE Ba

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5
Q

Positive result for sulfate ion?

A

White ppt. Beware false positives with carbonate ions.

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6
Q

Equation for Sufate ion test?

A
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7
Q

Test for carbonate reagent?

A

HCl or other acid

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8
Q

Positive observation for carbonate?

A

Fizzing

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9
Q

What’s a real world use for carbonate testing?

A

HCl used to test for carbonates in rock samples

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10
Q

Write and equation testing for carbonate

A
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11
Q

Reagent for halide ions?

A

Silver nitrate, AgNO3

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12
Q

What are halide ions?

A

Cl-,Br-,I-

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13
Q

Chloride plus silver nitrate observation?

A

White ppt

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14
Q

Bromide plus silver nitrate observation?

A

Creat ppt

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15
Q

Iodide plus silver nitrate observation?

A

Yellow ppt

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16
Q

Silver nitrate plus halide equation?

A
17
Q

halide and silver nitrate precipitate: what happens when adding dilute ammonia? What about concentrated ammonia?

A
18
Q

Define first ionisation energy

A

Energy needed to remove one mole of electrons from one mole of gaseous atoms

19
Q

Which factors affect ionisation energy?

A
  • HIgher nuclear charge = higher IE
  • bigger atomic radius = lower IE
  • more electron shells = lower IE
20
Q

Define disproportionation

A

A reaction in which the same element is both reduced and oxidised

21
Q

What are the benefits and risks of chlorine water treatment?

A
  • Benefits-Kills harmful bacteria
  • Risk- Chlorine is toxic
  • Risk- formation of chlorinated hydrocarbons
22
Q

define oxidising agent

A

The reactant causing the oxidation (gains electrons)

23
Q

Define reducing agent

A

Reactant causing the reduction (gains electrons)

24
Q

:(

A

:(

OCR A A level Chemistry (21 decks)

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