Question

please answer 4,5th as fast as you can

Answer 1

Answer:

4. When Sodium Hydrogen carbonate is heated then Sodium carbonate , water and carbon dioxide is formed.

5. (1) The constituents which make up solder alloy are lead and tin. It has a low melting point but has excellent electrical conductivity, so it is used for soldering of electrical wires.

(2) The constituents which make up solder alloy are lead and tin. It has a low melting point but has excellent electrical conductivity, so it is used for soldering of electrical wires.

Explanation:

NaHCo3------> Na2CO3 + H2O + CO2

Balancing

2NaHCO3------> Na2CO3+ H2O +CO2

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Answer 2

Answer:

4)

On heating sodium hydrogencarbonate (NaHC03), it decomposes to form sodium carbonate (Na2C03), water (H20) and carbon dioxide (C02).

2NaHCO3(s) on heating gives ⇒ Na2CO3(s) + CO2(g) + H20(l)

5)

Bronze is an alloy consisting primarily of copper, commonly with about 12% tin and often with the addition of other metals (such as aluminium, manganese, nickel or zinc) and sometimes non-metals or metalloids such as arsenic, phosphorus or silicon.

Solder is made up of tin and Stainless steel is a metal alloy, made up of steel mixed with elements such as chromium, nickel, molybdenum, silicon, aluminum, and carbon.