Calcium nitrate decomposes when heated to form calcium oxide.
2Ca(NO3)2→2CaO+4NO2+O22\text{Ca(NO}_3)_2 \rightarrow 2\text{CaO} + 4\text{NO}_2 + \text{O}_22Ca(NO3)2→2CaO+4NO2+O2
Calculate the mass of oxygen made when 0.650.650.65 moles of calcium nitrate decomposes. Relative atomic mass (ArA_{\text{r}}Ar): O=16.0\text{O} = 16.0O=16.0.
Mass of oxygen = ........................................................................... g\text{........................................................................... g}........................................................................... g
Calculate how many molecules of nitrogen dioxide, NO2\text{NO}_2NO2, are produced from 0.650.650.65 moles of calcium nitrate. The Avogadro constant is 6.02×10236.02 \times 10^{23}6.02×1023. Give your answer to 3 significant figures.
Number of molecules of NO2=...........................................................................\text{NO}_2 = \text{...........................................................................}NO2=...........................................................................
The neutralization of an acid with an alkali is an exothermic reaction. Complete the reaction profile for an exothermic reaction.
Include the labels:
- products
- activation energy
- energy change of reaction
Calcium nitrate is an ionic compound. Explain why calcium forms Ca2+\text{Ca}^{2+}Ca2+ ions.
A solution containing calcium ions reacts with a solution containing hydroxide ions. Solid calcium hydroxide is made. Write the balanced ionic equation for this reaction.