Chemistry like Physics is all around us. In my opinion, indepth knowledge of the periodic table and the movement of electrons will go a long way in creating a strong foundation to tackle Chemistry questions.

Question about solution, KS2021 Theory Q2. Background story time, back in 2010, I was in Nepal thinking about creating experiments with learning points for a brand new science lab at the Peace Garden School, near Khokana in Kathmandu. They had filter paper and a funnel. So I came up with “separation of mixture” experiment. Salt and sand were readily available. I used evaporation to create the biggest salt crystal that the teachers had ever seen. H₂O so elements Hydrogen and Oxygen are present. NaCl is Sodium Chloride. I think the picture needs to show a homogenous mixture and the question clearly stated a mixture, so there are invaluable particles and the relative density, so should be at the bottom.

Acidity, pH is ions (protons) so movement of ions (instead of electrons). Knowledge of Redox reactions will be useful.

Knowledge of Periodic table, word equation and various equations are required to complete the question.

KS2021 Theory Q3 is also a Chemistry questions. Physical changes are like water turning to into steam. Chemical changes are fundamental change in the chemicals, like combustion of hydrocarbons resulting in carbon dioxide and water vapour. Other related information, Calcium Carbonate, aka limestone is insoluable. Word equations seem to be the fundamental part of KS Chemistry questions.

KS2020 Theory Q4 and Q5 are Chemistry questions. Word equation is required again. The physical state of the reactants and products are important for observation. Reaction plot needs to show a change of rate to equilibrium (flat line). There is an atomic mass calculation question.

Q5 inspired me another background story. In 2010, I travelled to Annapurna, in Nepal and trekked to 5400m high. So for 5(a) water certainly boils at 60 Celsius. (so not cooking at all) or the egg falls faster due to lower air resistance. The atmosphere pressure acting on the surface of the water is lower at high altitude.

Redox reactions, which element will the electrons go to? All the reasons on the flask, think about the ambient conditions. Combustion with less oxygen will result in a difference in appearance.

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