give one example each of a chemical reaction showing the following characteristics.
a)evolution of gas b)change in color
c)formation of precipitate d)change of state from liquid to gas
e)change in state from gas to liquid
Answers
Answered by
4
Hello!!!
Your answer is:
a)/ d) When a piece of aluminum is put in a test tube containing hydrochloric acid, we obtain aluminum chloride with release of hydrogen gas.
Al + HCl(aq) -------> AlCl3 + H2(g)
b)/ c) Lead nitrate with potassium iodide forms yellow precipitate of lead iodide.
Pb(NO3)2 + KI --------------> PbI2 + KNO3
e) When carbon dioxide is blown into limewater, calcium carbonate along with water is formed.
Ca(OH)2 + CO2(g) --------------> CaCO3 + H2O(l)
Hope it helps you!!!!
Your answer is:
a)/ d) When a piece of aluminum is put in a test tube containing hydrochloric acid, we obtain aluminum chloride with release of hydrogen gas.
Al + HCl(aq) -------> AlCl3 + H2(g)
b)/ c) Lead nitrate with potassium iodide forms yellow precipitate of lead iodide.
Pb(NO3)2 + KI --------------> PbI2 + KNO3
e) When carbon dioxide is blown into limewater, calcium carbonate along with water is formed.
Ca(OH)2 + CO2(g) --------------> CaCO3 + H2O(l)
Hope it helps you!!!!
Answered by
8
Answer:
1. Change in colour :
The reaction between lead nitrate solution and poassium iodide solution.
Chemical equation as follow :
Pb ( NO₃ )₂ + 2 KI ⇒ PbI₂ + 2 KNO₃
In above reaction colour change from colourless to yellow.
2. Change in temperature :
The reaction between dil. sulphuric acid on zinc.
Chemically :
Zn + H₂SO₄ ⇒ ZnSO₄ + H₂
Heat evolved in the above reaction.
3. Formation of precipitation :
The reaction between barium chloride on sodium sulphate.
Chemically :
BaCl₂ + Na₂SO₄ ⇒ BaSO₄ + 2 NaCl
In the above reaction white ppt. of BaSO₄ will form.
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