chemical equation and ionic equation(20marks)

a 條題目有問題,reactant係calcium同carbon dioxide,何來product會有hydrogen(water,H2O)
b 2H(g)+O(g)_ _ _>H2O(l) --呢個做唔到ionic

c Na2CO3(s)+2HCl(aq)_ _ _>2NaCl(aq)+CO2(g)+H2O(l)
Ionic: Na2CO3+2H(+)_ _ _>2Na(+)+CO2+H2O

2 要balance chemical equation好易,只要左邊d element既數目同右邊就得
你先write好d formula先,拎返c做例, 未balance之前係Na2CO3(s)+HCl(aq)_ _ _>NaCl(aq)+CO2(g)+H2O(l)
但係有2粒hydrogen係H2O(water)度,所以左邊既HCl要x2,咁樣又多左粒Cl,但只要右邊既NaCl x 2又得(左邊咁岩有2粒Na)
至於要點做先易d,其實只要做得多就做得快。
而ionic 就要分開aq form 既compound,好似2HCl 分左2H(+)同2Cl(-)
之後cancel2邊相同既野就ok

?中文OK