Question

1. Explain the reaction between sodium and water.
2.What is a displacement reaction? Explain with an example,
3.Mention any two ways of preventing iron from rusting.
4. Write a short note on the metals in the human body.
5.How do non-metals differ from metals in their physical properties?
6. List the uses of silicon and phosphorus.
7. What is an alloy? Explain with an example,
please answer fast​

Answer 1

Answer:

reaction between sodium and water is like Na+H2o > Naoh + h2

Answer 2

Explanation:

1 . Sodium metal reacts rapidly with water to form a colourless basic solution of sodium hydroxide (NaOH) and hydrogen gas (H2). The reaction continues even when the solution becomes basic. The resulting solution is basic because of the dissolved hydroxide. The reaction is exothermic.

2 . Displacement reaction is a chemical reaction in which a more reactive element displaces a less reactive element from its compound. Both metals and non-metals take part in displacement reactions. Example : Reaction of iron nails with copper sulphate solution.

3 . State two ways to prevent the rusting of iron

•Many different types of coatings can be applied to the surface of the exposed metal in order to prevent corrosion. ...

•Galvanization is the process of applying a protective layer of zinc on a metal. ...

•Providing the metals with an electric charge can help inhibit the electrochemical reactions that lead to rusting.

4 .

• Calcium (Ca) Structure of bone and teeth. ...

• Phosphorous (Ph) Structure of bone and teeth. ...

• Magnesium (Mg) Important in bone structure. ...

• Sodium (Na) Major electrolyte of blood and extracellular fluid. ...

• Potassium (K) Major electrolyte of blood and intracellular fluid. ...

• Chlorine (Cl) ...

• Sulfur (S)

5 . Nonmetals generally have low density. Metals are sonorous as they produce a deep, ringing sound when hit by an object. Nonmetals are non-sonorous as they do not produce a ringing sound when hit by an object. Metals generally have high melting and boiling point except for sodium and potassium.

6 . Silicon is used to create silicone, which chemically are silicon-oxygen polymers with methyl groups attached. Solar panels. High power lasers. White phosphorus is used in flares and incendiary devices.

7 . An alloy is an admixture of metals, or a metal combined with one or more other elements. For example, combining the metallic elements gold and copper produces red gold, gold and silver becomes white gold, and silver combined with copper produces sterling silver.

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