6. Hydrogen Flashcards
How does Hydrogen occur in free and combined state?
Pg 125,126
Which metals react with cold water and what do they form? Write equation.
K, Na, Ca
Pg 126
Which metals react with steam and what do they form? Write equation.
Al, Mg, Zn, Fe
Pg 126
Which metals react violently with cold water? Do they float or sink?
Na, K. Float (melts in water)
Which metal reacts briskly with cold water? Does it sink or float in water?
Ca. Sink (doesn’t melt in water)
Which metal reacts the fastest with steam?
Mg
In which metals do the reaction stop after sometime? Why?
Mg, Al, Zn
Pg 126
Reaction with which metals and acids are highly explosive and is not feasible under laboratory conditions?
Na, K, Ca
Why is nitric acid not used to prepare hydrogen?
Pg 126
Why can be lead used for preparing hydrogen from HCl or H2SO4?
Pg 127
What are the chemical equations of metal with diluted acid?
Pg 126
Which metals are reacted with Caustic acids and in which form?
Al, Zn, Pb in powdered form
What are the caustic alkalis?
Caustic soda(NaOH), Caustic Potash(KOH)
Why are metals reacted in powdered form only?
Bcz the rate of reaction increases if metals are in the powedered form.
What are the conditions on which the reaction depends?
- Alkali solution should be concentrated
2. The reactants must be boiled
