SHORT ANSWER TYPE QUESTIONS
1. What is an element and how are elements classified?
2.Write the reaction which takes place when sodium oxide reacts with water.
3. Give two uses of metals and non-metals
4 Write the word equation for the reaction of magnesium with boiling water
5. Give two uses of highly sonorous metals.
Answers
1) Elements in the same group of the periodic table have similar chemical properties. Elements can be classified as metals, metalloids, and nonmetals, or as a main-group elements, transition metals, and inner transition metals. Groups are numbered 1–18 from left to right.
2)Reaction with water: Sodium oxide reacts exothermically with cold water to produce sodium hydroxide solution. A concentrated solution of sodium oxide in water will have pH 14.
3) Metals Iron is used for making automobiles, machinery, pipes, containers, nails, etc. Gold and silver are used for making jewellery. Copper is used for making electrical wires, cooking utensils, etc. ... Non-metals Hydrogen is used for the synthesis of ammonia and methyl alcohol, in welding torches, etc.
4) Equation : 2Li(s) + 2H2O(l) → 2LiOH(aq) + H2(g)
5)1. Sonorous metals can be used to make musical instruments like steel drums or metalophones.
2. . They are used in electrical cables, because they are malleable, ductile and good conductors of electricity.