Group 2 and Group 7

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  • Created by: R214116
  • Created on: 18-10-18 19:31
Going down the group, do group 7 elements get more or less electronegative? Why?
Less electronegative. Greater shielding and larger atomic radius.
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Going down the group, do the melting points of group 2 elements increase or decrease? Why?
Decrease because delocalised electrons are further from the positive nucleus so the strength of metallic bond decrease.
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What products will a reaction between water and chlorine form in a shady region?
HCl and HClO
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Going down the group, what is the trend of the solubilities of group 2 hydroxides?
Solubilities increase
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Describe the trend of the solubilities of group 2 sulfates going down the group?
Solubilities decrease.
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What is the trend of the reducing abilities of group 7 elements?
Reducing abilities increases
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Going down group 2, what is the trend in reactivity with water?
Reactivity increases
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How can you test for hydrogen halides?
Damp blue litmus paper turns red OR ammonia gives white fumes
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What is the use of HClO?
Kills bacteria in swimming pools, bleach
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How can you test for sulfur dioxide?
Acidified potassium dichromate VI solution soaked filter paper turns from orange to green
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What products are made when sodium chloride reacts with conc sulfuric acid?
NaHSO4 and HCl
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What result will iodide ions give in the halide test?
Yellow ppt that does not dissolve in dilute or conc ammonia
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What products are made when sodium bromide reacts with conc sulfuric acid?
NaHSO4 and HBr and BR2 and SO2 and H2O
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What products are made when sodium iodide reacts with conc sulfuric acid?
NaHSO4 and HI and I2 and SO2 and H2O and H2S and S
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How can you test for hydrogen sulfide?
Lead nitrate soaked filter paper goes from colourless to grey OR lead ethanoate paper turns from white to black
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How do you test for halide ions?
Acidify with nitric acid, add silver nitrate, add dilute ammonia followed by conc ammonia?
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Going down, what is the trend of group 7 melting points? Why?
Melting points increase as bigger molecules create greater van der waals forces
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What is the trend in the group 7 element's oxidising ability going down?
Oxidising ability decreases
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What result will chloride ions give in the halide test?
White ppt that dissolves in dilute ammonia and conc ammonia
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Due to chlorine's reaction with water in sunlight, what is added to swimming pools as an alternative? What is the equation for the reversible reaction?
Sodium chlorate I - NaClO + H2O <---> Na+ + OH- + HClO
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What result will bromide ions give in the halide test?
Cream ppt that dissolves only in conc ammonia
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What products will a reaction between water and chlorine will form in direct sunlight?
4HCl and O2
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What are the two forms of the chlorate ion?
ClO is chlorate I and ClO3 is chlorate V
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What type of reaction is chlorine with water?
Disproportionation
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What is/are the equation(s) for the reaction of sodium iodide with conc sulfuric acid?
NaI + H2SO4 --> NaHSO4 + HI ///// 8H(+) + 8I(-) + H2SO4 ---> H2S + 4H2O + 4I2
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What is/are the equation(s) for the reaction of sodium bromide with conc sulfuric acid?
NaBr + H2SO4 ---> NaHSO4 + HBr /////// 2H(+) + 2Br(-) + H2SO4 ---> SO2 + 2H2O + Br2
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What is/are the equation(s) for the reaction of sodium chloride?
NaCl + H2SO4 ---> NaHSO4 + HCl
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Other cards in this set

Card 2

Front

Going down the group, do the melting points of group 2 elements increase or decrease? Why?

Back

Decrease because delocalised electrons are further from the positive nucleus so the strength of metallic bond decrease.

Card 3

Front

What products will a reaction between water and chlorine form in a shady region?

Back

Preview of the front of card 3

Card 4

Front

Going down the group, what is the trend of the solubilities of group 2 hydroxides?

Back

Preview of the front of card 4

Card 5

Front

Describe the trend of the solubilities of group 2 sulfates going down the group?

Back

Preview of the front of card 5
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