Calculaţi randamentul reacţiei () de descompunere a calcarului( CaCO3) , ştiind că se supun descompunerii termice 4t de calcar de puritate 80% şi se obțin practic 1344 kg de var nestins(CaO) .

it is to be noted that an alpha particle is an helium nucleus. so it contains 2 protons 2 neutrons and has a mass number of 4. when alpha decay particles are ejected from the nucleus it gets transformed into an atom which has atomic number less than 2 and a mass number less than 4.

an equation that could represent alpha decay is radium 226 decay of alpha particle forms radon 222.

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if you're asking what comes out, it's steam.

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.

i wish i could but this one is weird give me abc and i can solve it.