7. Sulphur is a metal. 8. Non-metals react with acids Write short answers 1) Why are sodium and potassium stored in kerosene? What happens when sulphur reacts with oxygen? 3 What is a displacement reaction? Why do copper vessels turn green with the passage 5 Why are metals used for making metal cables? Differentiate between metals and non-metals?
Answers
Answer:
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Explanation:
1) Sodium and Potassium are highly reactive metals and react vigorously with the oxygen, carbon dioxide and moisture present in the air such that it may even cause a fire. To prevent this explosive reaction, Sodium is kept immersed in kerosene because Sodium doesn't react with kerosene.
2) sulfur + oxygen →
Sulfur burns in oxygen to form sulfur dioxide.
Word equation: carbon + oxygen → carbon dioxide
Chemical equation: C + O2 → CO2
3) Displacement reactions occur when a metal from the electrochemical series is mixed with the ions of a metal lower down in the electrochemical series. The atoms of the more reactive metal push their electrons on to ions of the less reactive metal.
4) when copper vessels are exposed to air in rainy season for sometime, the metal reacts with gases and moisture present in air to form a mixture of copper carbonate and copper hydroxide [(CuCO). ... Cu(OH)]. This gives a green colour to the vessels.
5) Metals are good conductors of electricity and are ductile i.e. can be drawn into thin wires hence they are used for making wires.
Metals Non-Metals
Metals displace hydrogen from dilute acids. Non-metals do not react with dilute acids
Metals form ionic chlorides with chlorine.. Non-metals form covalent chlorides with chlorine
Answer:
(Q1) ans- Sulphur is a non–metal with symbol S and atomic number 16. Because it’s not placed in metal group in the periodic table. Because it is consistent with the 3 physical properties listed for non-metals. It is a poor conductor of heat and electricity because the electrons are not free to move. The group is called the oxygen group or the chalcogens.
(Q2) ans - Non-metals do not react with acids. This is due to the fact that a substance undergoing reaction with acids, donates electrons to the H+ ions produced by the acids. But non-metals are acceptor of electrons and hence they do not donate electron to the hydrogen ion of the acid.
(Q3) ans- Sodium and Potassium are highly reactive metals and react vigorously with the oxygen, carbon dioxide and moisture present in the air such that it may even cause a fire. To prevent this explosive reaction, Sodium is kept immersed in kerosene because Sodium doesn't react with kerosene.
(Q4) ans- sulfur + oxygen →
Sulfur burns in oxygen to form sulfur dioxide.
Word equation: carbon + oxygen → carbon dio...
Chemical equation: C + O2 → CO2
(Q5) ANS - Displacement reactions involve a metal and a compound of a different metal. In a displacement reaction:
a more reactive metal will displace a less reactive metal from its compounds
Displacement reactions are easily seen when a salt of the less reactive metal is in the solution. During the reaction:
the more reactive metal gradually disappears as it forms a solution
the less reactive metal coats the surface of the more reactive metal
For example, magnesium is more reactive than copper. When a piece of magnesium is dipped into blue copper sulfate solution:
the blue colour fades as colourless magnesium sulfate solution forms
brown copper coats the surface of the magnesium
(Q6) ans - Copper turns green because of chemical reactions with the elements. ... Just as iron that is left unprotected in open air will corrode and form a flaky orange-red outer layer, copper that is exposed to the elements undergoes a series of chemical reactions that give the shiny metal a pale green outer layer called a patina.
(Q7) ans- Metals are good conductors of electricity and are ductile i.e. can be drawn into thin wires hence they are used for making wires
(Q8) ans -Metals Non-Metals
Metals are solids at room temperature.Except for mercury which is a liquid metal. Non-metals may be solid, liquid or gases at the room temperature.
Metals are strong and tough. Non-metals are not strong or tough.