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Answers
Explanation:
question no. 1 answer = What does the 'pop' sound indicate? As before, the 'pop' sound indicates the presence of hydrogen gas. Metals react with sodium hydroxide to produce hydrogen gas. Reactions of non-metals with bases are complex.
question no. 2 answer = Some metals react with a base to form salts and hydrogen gas. ... All the metals do not react with bases to form salt and hydrogen. Reaction of non-metal with a base. Some non-metals react with bases but no hydrogen gas is produced.
question no.3 answer =Reactivity Series of metals Chart
Metal Symbol Extraction
Sodium Na Electrolysis
Magnesium Mg
Aluminium Al
Carbon C
question no.4 answer= A single-displacement reaction, is a chemical reaction in which one element is replaced by another in a compound. It can be represented generically as: A + B-C → A-C + B This will most often occur if A is more reactive than B, thus giving a more stable product.
question no. 5 answer = (a) Answer: When zinc granules are kept in copper sulphate solution, the blue colour of copper sulphate disappears and the solution becomes colourless. Zinc is more reactive than copper and hence displaces copper from copper sulphate solution and forms zinc sulphate.
(b) answer = What happens when copper turnings are added to iron sulphate solution? Why? In the displacement reaction , it is only possible for the more reactive metal to displace the less reactive metal . Copper lies below iron in the reactivity series i.e. iron is more reactive than copper.
(c) answer=When zinc is added to the solution of iron sulphate, the colour of iron sulphate solution changes. It is because zinc is more reactive than iron, therefore, it displaces iron from its solution of iron sulphate and a grey precipitate of iron and a colourless solution of zinc sulphate is formed.
(d) answer When zinc is added to copper sulphate (CUSO4) solution due to more reactivity of zinc, cooper is replaced by the zinc and forms zinc sulphate. During the process, the colour of the solution changes from blue to colourless. The chemical equation of the reaction, Zn + CuSO4 → ZnSO4 + Cu.
question no. 6 answer =Uses of nonmetals in our daily life: Oxygen which is 21% by volume helps in the respiration process. It is also used for manufacturing of steel and provides high temperature in metal fabrication process. ...
Nonmetals used in fertilizers: Fertilizers contain nitrogen. It helps in plant growth. ...
Nonmetals used in crackers
uses of metal =Gold, Platinum and silver are used as jewelleries and ornaments.
Iron and steel are used for construction purpose.
Aluminium, steel are used as utensils.
Mercury is used in thermometer and helps to check the temperature.
Aluminium are used as insulation.
Answer:
pop sound indicates hydrogen gas is produced
match stick stop