A metal conducts heat in a similar way to electricity so, as you touch it, it draws heat from your body and makes your hand feel
cold. Plastics don't have to conduct heat so they don't draw heat from your body as efficiently, that's why a piece of plastic
feels than a piece of metal even if it's at the same temperature.
A)
long-chain molecules; warmer
B)
free electrons, warmer
o
valence electrons, colder
a crystalline lattice; colder
What is the answer please??

  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.

it should have an internal chamber and two thermometers sticking out of the top. the internal chamber will also be closed off from the outside.