Zadanie 2b
Draw the Lewis (electron dot) structure of a molecule of methanol, CH3OH, showing all valence electrons.
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Draw the Lewis (electron dot) structure of a molecule of methanol, CH3OH, showing all valence electrons.
Methanol is manufactured from carbon monoxide and hydrogen. The reaction involves the equilibrium: CO(g) + 2 H2(g) ⇌ CH3OH(g) (i) Deduce the expression for the equilibrium constant, Kc, for this equation. (ii) Explain why an increase in pressure…
Whether a higher temperature favours the formation of methanol depends on the enthalpy change of the reaction CO(g) + 2 H2(g) → CH3OH(g) (i) Determine the enthalpy change, ΔH, for the production of methanol, in kJ, using bond enthalpies. Use…
Methylamine is a gas that dissolves in water to form an alkaline solution: CH3NH2(aq) + H2O(l) ⇌ CH3NH3+(aq) + OH−(aq) (i) State the relationship between CH3NH3+ and CH3NH2 in terms of the Brønsted-Lowry theory. (ii) A sample of…
A compound contains only carbon, hydrogen and oxygen. Complete combustion of 4.60 g of the compound produces 8.80 g of carbon dioxide and 5.40 g of water as the only products. Which is the empirical formula of the compound?…
Explain why the first ionization energy of magnesium is greater than that of sodium.
The diagram represents the electron energy levels in a hydrogen atom. (i) Suggest two features of the behaviour of electrons in atoms that this energy level model cannot explain or represent. (ii) Draw an arrow, labelled Z, on the diagram to represent the…
A compound has the empirical formula CH2Cl and a relative molecular mass of 99. What is the molecular formula of the compound? A. CH2Cl B. C2H4Cl2 C. C3H6Cl3 D. C4H8Cl4
Zinc can be obtained by the electrolysis of molten zinc chloride, ZnCl2. Write the half-equation for the formation of zinc at the negative electrode.
Suggest an experiment that shows that zinc is more reactive than copper, giving the observation that would confirm this.