The science of how Messi keeps the ball close to himself photo credit: ZaleDesigns Messi is a magician with the ball at his feet. He's in my opinion the best player in the sense that he can control the ball so well, runs so fast with the ball & changes the direction at full speed like it's a walk in the park. For starters he started playing very early (at 3) which is crucial if you want to be a good player. In that aspect, he's God gifted as he had dribble skills which is genetic in my opinion. Height He is short which means a low center of gravity so it's difficult to push him off the ball. That's why we see that anyone rarely can topple him down, instead players much larger than him lose possession to him. So his short height suits his style of play & is a blessing in disguise. Change of pace Messi changes his pace really well. He starts slow and runs directly at the defender which means the defender has to stop & focus on him. When he reac...
Materials: Metals and Non-Metals 1
Introduction
The metals can be distinguished from the non-metals on the basis of their chemical and physical properties.
The property of metals by which they can be beaten into thin sheets is known as malleability.
The property of metal by which it can be drawn into wires is known as ductility.
The metals are normally hard, malleable, lustrous, ductile, sonorous, and good conductors of heat and electricity. E.g. iron, copper, calcium, aluminum, magnesium, etc.
The materials, which are not sonorous and are poor conductors of heat and electricity, are known as non-metals. E.g. sulphur, carbon, oxygen, phosphorus, etc.
Some metals, such as sodium and potassium are soft and can be cut with a knife.
Mercury is the only metal, which remains in liquid state at room temperature.
When sulphur dioxide is dissolved in water, sulphurous acid is formed. Illustration - Sulphur dioxide (SO2) + Water (H2O) → Sulphurous acid (H2SO3).
Oxides of non-metals are acidic in nature.
The sulphurous acid changes blue litmus paper red.
Phosphorus is a very reactive non-metal and it catches fire whenever exposed to air.
To prevent the contact of phosphorus with atmospheric oxygen, Phosphorus is stored in water.
On burning, metals easily react with oxygen and produce metal oxides, these are basic in nature.
Non-metals react with oxygen and produce non- metallic oxides; these are acidic in nature.
Some metals react with water and produce metal hydroxides and hydrogen gas.
Nonmetals normally do not react with water.
Metals also react with acids and produce hydrogen gas and metal salts.
Non-metals normally do not react with acids.
Uses of Metals and Nonmetals
Metals are used in making machinery, airplanes, automobiles, trains, satellites, industrial gadgets, cooking utensils, water boilers, etc.
Non-metals are used in fertilizers to improve the growth of plants.
Non-metal are used in water purification.
Non-metals are used in crackers.
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