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Chemistry Unit 2 > 2.11.1 Group 7 > Flashcards

2.11.1 Group 7 Flashcards

1
Q

What is the formula, colour and standard state of fluorine?

A

F2, pale yellow, gas

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2
Q

What is the formula, colour and standard state of chlorine?

A

Cl2, green-yellow, gas

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3
Q

What is the formula, colour and standard state of bromine?

A

Br2, red-brown, liquid

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4
Q

What is the formula, colour and standard state of iodine?

A

I2, black, solid

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5
Q

What is produced when iodine is heated?

A

A purple vapour is produced

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6
Q

What are the group 7 elements called?

A

The halogens

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7
Q

What is the trend in boiling points down group 7?

A

The boiling point decreases down the group

  • the atoms get larger
  • the strength of the Van der Waals’ forces increase
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8
Q

What is the trend in electronegativity down group 7?

A

All the halogens are strongly electronegative, with fluorine being the most, and iodine the least

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9
Q

What is the trend in polarity of the hydrogen halides?

A

Hydrogen fluoride is strongly polar, and hydrogen iodide is almost non-polar

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10
Q

Are halogens reducing or oxidising agents?

A

All halogens gain electrons to make the halide ions, so all the halogens are oxidising agents

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11
Q

What is the trend in oxidising power down group 7?

A

The halogens get larger down the group, meaning their oxidising powers get weaker as they lose the ability to attract electrons

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12
Q

What is a displacement reaction?

A

A redox reaction in which one halogen replaces another

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13
Q

What is the trend in reducing power down the halide ions?

A

Halide ions become stronger reducing agents down the group

  • more shielding
  • less attraction between the nucleus and outer electrons
  • the electrons are donated more easily
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14
Q

Describe the process of the silver nitrate test to identify halide ions

A

1- add silver nitrate solution and look for a precipitate

2- add ammonia solution to see if the precipitate dissolves

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15
Q

Why is a precipitate formed when silver nitrate is added to halide ions?

A

Silver nitrate is soluble in water and reacts with halide ions in solution to form silver halides

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16
Q

Why should you add a few drops of dilute nitric acid to your test solution when doing the silver nitrate test?

A

To prevent the formation of other silver compounds such as silver carbonate

17
Q

What happens when silver nitrate is added to the fluoride ion?

A

There is no observable change

18
Q

What happens when you add silver nitrate to chloride ions?

A

A white precipitate is formed

19
Q

What happens when you add silver nitrate to bromide ions?

A

A cream precipitate is formed

20
Q

What happens when you add silver nitrate to iodide ions?

A

A yellow precipitate is formed?

21
Q

What is the trend in solubility from AgCl to AgI?

A

It decreases from AgCl to AgI

Chemistry Unit 2 (27 decks)

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