Explain activity 3.9 ncert science class 10
Answers
Answer:
Activity 3.9 asks us to burn various metals and observe their flame.
Explanation:Flame colour:
Sodium: Yellow
Magnesium: White
Aluminium: Silver white
Copper :blue flame
Solubility:
Metal oxides from metal hydroxide with water, so they are soluble in water. Beryllium and magnesium are exceptions as they are slightly soluble in water.
Metal oxide + H2O(l) ———> Metal Hydroxide.
Explanation:
Metals are highly reactive elements. They react with oxygen readily to form metal oxides. Highly reactive metals like lithium, sodium, potassium, beryllium, magnesium react spontaneously. Other metals like Aluminum, copper take time to burn. It produces a specific flame colour. Many times flame colour is used to find the constituent of the substance.
Metal + O2(g) ———> Metal oxide(s)