Group 7 Flashcards
Give the products of this equation:
NaCl (s) + H2SO4 (aq) —>
NaHSO4 (s) + HCl (g)
State the observation for this reaction:
NaCl (s) + H2SO4 (aq) —> NaHSO4 (s) + HCl (g)
Steamy Fumes
Give the half equation for the oxidation of bromide ions?
2Br- —> Br2 + 2e-
What are the observed when bromide ions react with sulphuric acid in a redox reaction?
Acidic Gas (SO2)
Brown Fumes (Br2)
State the 3 different sulphur products that can be formed with iodide ions reacts with H2SO4?
Sulphur Dioxide (SO2)
Sulphur (S)
Hydrogen Sulphide (H2S)
What is the observation when iodine is formed in a reaction with H2SO4?
Black solid
The student noticed some of the liquid injected into a gas syringe didn’t vaporise. Explain the effect this has on the Mr calculated by the student?
Lower volume recorded so Mr increases
What’s the observation of:
- H2S
- S
- SO2
- Bad-Egg Smell
- Yellow Solid
- Acidic Gas
What is the test for halide ions?
Why is this needed?
Acidified Silver Nitrate (AgNO3)
To remove carbonate ions
What is observed when dilute ammonia (NH3) is added to AgCl?
White precipitate dissolves
What is observed when dilute ammonia (NH3) is added to AgBr?
Cream precipitate remains
What is observed when concentrated ammonia (NH3) is added to AgBr?
Cream precipitate dissolves
What is observed when concentrated ammonia (NH3) is added to AgI?
Yellow precipitate remains
Why is chlorine added to drinking water?
To kill bacteria
Cl2 (g) + H2O (l)
<—> HClO (aq) + HCl (aq)