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Chemistry Module 3 > 3) Group 7 > Flashcards

3) Group 7 Flashcards

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1
Q

Describe the trend in mpt/ bpt down group 7

A
  • mpt/ bpt increases down group 7
  • Number of electrons increases so greater uneven distribution of electrons
  • Stronger induce- dipole- dipole attractions
  • So more energy required to break the attraction between molecules
  • Hence mpt/ bpt increases
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2
Q

Define volatility

A

This is the ease with which a liquid turns into a gas

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3
Q

Describe the trend in volatility down group 7

A
  • Volatility decreases down the group
  • Increase number of electrons
  • Increase in the uneven distribution of electrons
  • Stronger induce-dipole-dipole attraction
  • More energy is needed to overcome the attraction between molecules
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4
Q

Describe the reactivity down the group 7

A
  • Reactivity decreases down a group
  • Atoms increases in size down the group/ more shells
  • More shielding due to inner shells
  • Less nuclear attraction for incoming electrons
  • Electron gained less easily
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5
Q

Define oxidising powder

A

this is the ability of an atom or species to oxidies another species ( take an electron from it)

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6
Q

What is the colour of Cl in water

A

Pale green

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7
Q

What is the colour of Br in water

A

Orange

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8
Q

What is the colour of I in water

A

Brown

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9
Q

What is the colour of I in cyclohexane

A

Purple/ violet

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10
Q

What is the equation and precipitate formed when Cl is reacted with silver nitrate

A

Precipitate = white
Equation = Ag+ + Cl- = AgCl

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11
Q

What is the equation and precipitate formed when Br is reacted with silver nitrate

A

Precipitate = Cream
Equation = Ag+ + Br- = AgBr

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12
Q

What is the equation and precipitate formed when I is reacted with silver nitrate

A

Precipitate = Yellow
Equation = Ag+ + I- = AgI

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13
Q

What happens to the precipitate when dilute ammonia is added to AgCl

A

dissolves

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14
Q

What happens to the precipitate when dilute ammonia is added to AgBr

A

Remains the same

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15
Q

What happens to the precipitate when dilute ammonia is added to AgI

A

Remains the same

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16
Q

What happens to the precipitate when concentrated ammonia is added to AgCl

A

Dissolves

17
Q

What happens to the precipitate when concentrated ammonia is added to AgBr

A

Dissolves

18
Q

What happens to the precipitate when concentrated ammonia is added to AgI

A

Remains the same

19
Q

What is the main problem with using chlorine

A

Chlorine is a toxic gas

Chemistry Module 3 (7 decks)

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