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- 7. (a) Write a complete, balanced chemical equation to show how sodium carbonate removes calcium ions and magnesium ions irom hard water.(b) ОН Na OH(a) (i) (ii) (iii) With the aid of a simple schematic, explain what covalent bonding is and how it is formed. What are the differences between a covalent bond and an ionic bond? Which type of bond is found in crystalline silicon? At room temperature do you expect an ionic crystal to be a good electrical conductor or a good electrical insulator? Explain why.
- Complete and balance the following acid-base equations:(a) A solution of HClO4 is added to a solution of LiOH.(b) Aqueous H2SO4 reacts with NaOH.(c) Ba(OH)2 reacts with HF gas.Complete and balance the following equations: (a) CaO(s) + H2O(1) (b) Al>O3(s) + H*(aq) (c) NazO2(s) + H20(I) (d) N2O3(8) + H20(1) (e) KO2(s) + H,0(1) (f) NO(8) + O(8)Consider the solid Na2CO3 dissolving in water. (a) Write the balanced dissociation equation with phase labels. (b) Draw the solvation of the resulting ions in water.
- In the mountains, water in an open container will boil when(a) its critical temperature exceeds room temperature.(b) its vapor pressure equals atmospheric pressure.(c) its temperature is 100 °C.(d) enough energy is supplied to break covalent bonds.(e) none of these is correct.(a) Two unlabelled bottles are suspected to contain beryllium and magnesium. (i) Suggest a simple test to differentiate the metals present in the unlabelled bottles. (ii) State the observation obtained and write a balanced chemical equation for the reaction that takes place.Write a balanced equation for the formation reaction of each of the following substances: (a) K3PO4(s) (b) acetic acid, CH3CO2H(I) (c) trimethylamine, (CH3)3N(g) (d) bauxite, Al203(s)