Symbol equations for reactions are written using chemical formulae.
The thermal decomposition in this case is: CuCO3 -------------CuO + CO2
C + O2 = CO2 (an oxydation reaction)
Of course, not !
This is not an equation but the chemical symbol of the cation: Ba2+.
I'm not entirely sure but an unbalanced equation is: Mg + O2 -----> MgO
The thermal decomposition in this case is: CuCO3 -------------CuO + CO2
We see the chemical reaction but we write the chemical equation.
C + O2 = CO2 (an oxydation reaction)
With this symbol:
Phosphine is not very soluble in water compared to nonpolar substances. If you were to write a balanced equation for the reaction of PH3 with water, it would be an equilibrium reaction.
Of course, not !
This is not an equation but the chemical symbol of the cation: Ba2+.
This reaction is:CH3CH2CH2CH2NH2 + HCl -------------->[CH3CH2CH2CH2NH3]Cl
S+O2 = SO2
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The equation is:MgO + H2SO4 = MgSO4 + H2O
A general equation doesn't exist; this depends on type of the chemical reaction involved.