1C Jan 2012 Flashcards
1
Q
Describe a chemical test to show that a substance contains ammonium ions.
A
Add sodium hydroxide and gas given off turns litmus paper blue.
2
Q
Describe a chemical test to show that a substance contains chloride ions.
A
Add silver nitrate and nitric acid. White precipitate formed.
3
Q
Explain how the covalent bonds in the water molecule hold the hydrogen and oxygen atoms together.
A
Attraction between shared pair of electrons and nuclei.
4
Q
State, with a reason, the final colour of the litmus paper in the solution in methylbenzene with HCL.
A
Blue, no reaction.
5
Q
In the reaction with hydrogen and nitrogen, what is the catalyst and temperature?
A
Iron, 450C.
6
Q
Why do metals conduct electricity?
A
Delocalised electrons flow.
