Solid ionic compounds do not conduct electricity because the ions (charged particles) are locked into a rigid lattice or array. The ions cannot move out of the lattice, so the solid cannot conduct electricity. When molten, the ions are free to move out of the lattice structure.
(b) The sodium produced when the sodium azide decomposes is dangerous. The mixture of chemicals contains potassium nitrate and silicon dioxide which help to make the sodium safe. (i) Sodium reacts with potassium nitrate to make sodium oxide, potassium oxide and nitrogen. Complete the balancing of the equation for this reaction.
Aluminium oxide and zinc oxide are amphoteric in nature. An amphoteric substance shows both acidic and basic characters. It reacts with base like acid and reacts with an acid like a base. When zinc oxide reacts with sodium hydroxide, it behaves like an acid. In this reaction, sodium zincate and water are formed.
(a) The structure of silicon(IV) oxide is shown below. Key: O silicon atom O oxygen atom (i) Describe two similarities in the structure of silicon(IV) oxide and diamond.... (ii) Explain why silicon(IV) oxide has a high melting point. (iii) Explain why silicon(IV) oxide does not conduct electricity. 
Pure water doesn't conduct electricity. For electricity to travel through a liquid, a movement of charge must occur throughout and across the Why is normal water a good conductor of electricity? In tap water, rainwater and seawater, there are countless impurities, such as sodium (Na+), calcium...
(a) All the substances in the table are solids except one, which is a liquid. Which is the liquid at room temperature? (b) What do you notice about the substance you have chosen in (a) and the amount of energy needed to change a given number of particles from solid to liquid?
Explain, in terms of bonding, why pure water does not conduct electricity but sodium chloride solution does. (3) Explain why hydrogen gas is formed at the cathode and not sodium metal.
Pure water and Sodium chloride are both poor conductors of electricity by themselves. However, if sodium chloride crystals are dissolved into the water the solution becomes a good conductor of electricity. How does this phenomenon demonstrate the theory of . chemistry. How many grams of oxygen gas are required to react completely with 14.6 g of solid sodium to form sodium oxide, Na2O(s)? HW Entropy Question
53. Magnesium oxide can also be turned into magnesium and oxygen. Write an equation for this reaction. 54. What name is given to this type of reaction? 55. Explain why oxygen has a low melting point. 56. Explain why magnesium has a high melting point. 57. Under what conditions will magnesium oxide conduct electricity? 58.