Complete Table 5.1 so that it shows how many protons, neutrons and electrons are present in the $^{55}\text{Mn}$ atom and the $^{42}\text{Ca}^{2+}$ ion.
Suggest why manganese is predicted to form coloured oxides.
State which other property of manganese is demonstrated by the formation of several oxides.
State the formula for manganese(II) oxide.
Define the term reducing agent.
Complete the symbol equation by filling in the formula of the missing product and balancing the equation. $\dots\text{Mn}_3\text{O}_4 + \dots\text{Al} \rightarrow \dots + \dots\text{Mn}$
Calculate the volume of chlorine gas produced, in cm^{3}, at r.t.p. when excess MnO₂ reacts with 50.0 cm^{3} of 0.200 mol/dm^{3} HCl. Follow these steps. Calculate the number of moles of HCl used. Determine the number of moles of Cl₂ formed. Calculate the volume of Cl₂ formed.
Describe a test for chlorine gas. test results
Explain, in terms of collision theory, why a fall in temperature lowers the rate of this reaction.