B: 3
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Element Q is in Period 3 of the Periodic Table. It can form ions with the formula Q³⁻. Which element is most likely t…
A particle contains 34 protons, 45 neutrons and 36 electrons. Which symbol is correct for this particle?
The metals Cr, Co, Fe and Mn are all transition elements. Which particles have the same number of electrons?
The usual conditions for the Haber process are 250 atm pressure, 450°C and an iron catalyst. Which change in conditio…
Chlorine can be manufactured by the following reaction. 4HCl(g) + O2(g) ⇌ 2H2O(g) + 2Cl2(g) ΔH is negative A mixture …
Equations for reactions of iron and iron compounds are shown. Fe + 2HCl → FeCl2 + H2 2FeCl2 + Cl2 → 2FeCl3 FeSO4 + Mg…