Is it possible to have a chemical change without a physical change?

Chemical change or physical change?

  • I wanna ask 2 questions: 1. is cooling a saturated copper sulphate solution to form crystals a physical change or chemical change 2. is heating lead oxide with carbon to extract lead a chemical change or physical change thats it, plz help me guys, I need to hand in a report to my teacher tmr.....

  • Answer:

    Are you changing the substance when you cool copper sulphate solution?? No.. As a solution, copper and sulphate ions floating around in water... When you cool it, they get together, and form a crystal with copper ions and sulphate ions in specific lattice formations.. they are still copper ions and sulphate ions.. so no chemical change here... only physical change.. When you are heating the lead oxide with carbon and extracting lead, what are you doing?? lead oxide is a different chemical substance from lead.. what is happening to the carbon?? it reacts with the oxygen removed from lead oxide, and forms carbon dioxide.. so.. there is a chemical reaction here...

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Other answers

The first is physical because the chemical nature of the copper sulphate is what allows it to form the crystals. For the second, I think it would be chemcial because the lead looses the oxide. I'm not sure if this is because of the carbon and the heat or because of just the heat.

Bad bus driving wolf

cooling a saturated copper sulphate solution is a physical change heating a lead oxide with carbon to extract a lead is a chemical change

shagun

1.Physical 2.chemical

raj

the first one is physical but not sure about the second I think it's chemical

The first one is chemical. You are only cooling. The second one is chemical. You have lead oxide and are changing the chemical structure of this molecule with a reaction to get elemental lead.

Dr. J.

the first one cooling a saturated copper sulphate solution to form crystals is a physical change since there is no change of chemical prooperties of the substance. Onlt the physical properties change. Example change of any state solid-liquid-gaseous. On the other hand the second one heating lead oxide with carbon to extract lead is a chemical change as it changes the chemical properties of the substance(s). For Example when Hydrogen ie is a gas react with Oxygen (also a gas) they form a liquid(Water).

sudhanshu I

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