Answer the questions on a comment:
a) Which element is equivalent to this atomic mass: 65.39? And 40.08?
b) shows the number and the atomic mass of these elements: silver, sulfur and carbon
c) What information meets these atomic symbol: Kr, He, Rn, Pu?
d) iodine and 'metal?
e) Mixture or solution? Water + Oil =.... Water + sugar =....
f) What are isotopes?
g) 1 molecola di CH4 reagisce con 2 molecole di O2 formando...
h)Zn + H2SO4=
i)A che sostanza corrisponde le seguenti formule: HCl;NaOH;NaCl
l)quali sono gli acidi nucleici?
Le risposte esceranno il 24/02/09
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