Tag: metals

• Over the life of an incandescent light bulb, the filament begins to deteriorate and the particles will settle on the inside of the glass. In return the bulb will take on a grayish appearance and a slight decrease in light output may occur.
  
• For fluorescent bulbs only, the ends will blacken as the bulb is burned. Each time the lamp is turned on and off the emissions material settles on the inside of the glass. Extreme darkening generally indicates the bulb is about to burn out.
  

Hydrogen -- a light and extremely powerful rocket propellant -- has the lowest molecular weight of any known substance and burns with extreme intensity.  In combination with an oxidizer such as liquid oxygen, liquid hydrogen yields the highest specific impulse, or efficiency in relation to the amount of propellant consumed, of any known rocket propellant. 

Zinc metal burns in air only on strong heating to form zinc oxide.

 An amphoteric oxide is an oxide that can act as either an acid or base in a reaction.
$Al _2O _3$ is an amphoteric oxide. When reacted with HCl, it acts as a base to form the salt $AlCl _3$. When reacted with NaOH, it acts as an acid to form $NaAlO _2$.
also, zinc oxide is an amphoteric oxide.

Magnesium is a metal that burns in oxygen with a bright light and the reaction can be written as:
$2Mg + O _{2} \rightarrow 2MgO$

The metal stored in kerosene oil is Sodium(Na).

$ Zn + H _{2}O \rightarrow ZnO + H _{2}$
          (steam)

The metals which react with cold water are; sodium, calcium and magnesium.