Thermal and electrical conductivities are physical properties.
These elements have the general chemical and physical properties of metals: they are dense, hard, conductive, lose electrons etc.
"Very reactive" is a chemical property because it describes how likely a substance is to undergo a chemical reaction with other substances. It does not pertain to any physical characteristic of the substance.
Unknown; the knowledge of the chemical and physical processes are very old.
yes, it is a strong electrolyte (very conductive)
Reactivity is a chemical property, not a change.
Yes it is a chemical change because color change is an observed change that a chemical change has occurred. So you are very much right. :)
Chemical.
iron is very conductive like steel, nickel, and cobalt
yeah of course.. as indeed the presense of electrons is a chemical property but the necessary thing for conductance is the orientation of electrons that depends upon the nature of element that is the physical property of element..
A physical change
No wood does not conduct electricity very well.
Physical change does not produce a new substance. Chemical change produces a new substanceIn a chemical change the atoms/molecules are chemically joined together so they are very hard to separate. were as they are easyer to separate in a physical change