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Čo je správne:
Hasené vápno:
a) Získava sa reakciou oxidu vápenatého s vodou za uvoľňovania tepla,
b) Je hydroxid vápenatý získaný rozkladom vápenca,
c) Je vyrobené sušením hydroxidu vápenatého vo vysokých peciach,
d) Vyrába sa reakciou vápnika s vodou.
Vynásob čísla 5,02 . 10 na 16 a 6,54 . 10 na 18. Výsledok násobenia zapíš v tvare vedeckého zápisu. A urči hodnotu exponentu mocniny v tomto zápise.
V triede je b dievčat. Chlapcov je o tretinu menej ako dvojnásobok počtu dievca. Aky zápis vyjadruje počet chlapcov v triede?
Dobrý deň prajem, potrebovala by som poradiť s 3 príkladmi. 1. Na reakciu 300ml kyseliny sírovej s c= 0,5 mol.dm-3 sa navážilo 16g NaOH. Aká bude koncentrácia NaOH po reakcii, ak objem reakčnej…
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