Symbols, formulae and equations help chemists to explain chemical reactions in detail.
Which is the correct formula for sodium oxide?
Which is the correct formula for magnesium nitride?
Which is the correct formula for sodium hydroxide?
Which is the correct formula for ammonium carbonate?
Which is the correct sequence of numbers to get the following equation to balance? _C3H8 + _O2 → _CO2 + _H2O
1, 7, 3, 8
2, 8, 6, 8
1, 5, 3, 4
Which is the correct sequence of numbers to get the following equation to balance: _ Li + _N2 → _Li 3N
3, 1, 1
6, 1, 2
6, 1, 1
The half equation for the conversion of copper(II) ions to copper is
Cu2+ + 2e- → Cu
2Cu2+ + 4e- → Cu2
Cu2+ → Cu + 2e-
Chlorine reacts with sodium iodide to form sodium chloride and iodine. Which of the following is the ionic equation for this reaction?
2NaI + Cl2 → 2NaCl + I2
2I- + 2Cl → 2Cl- + 2I
2I- + Cl2 → 2Cl- + I2
Which of the balanced symbol equations is correct for the following word equation? calcium hydrogencarbonate + sulfuric acid → calcium sulfate + carbon dioxide + water
CaHCO3 + H2SO4 → CaSO4 + H2O + CO2
Ca(HCO)3 + HSO4 → CaSO4 + H2O + CO2
Ca(HCO3)2 + H2SO4 → CaSO4 + 2H2O + 2CO2