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How does Messi keep the ball close to himself

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...

explain the element zinc?

Chemistry - Zinc Introduction In the periodic table, zinc is the first element of group 12. The symbol of zinc is  ‘Zn’  and the atomic number is  ‘30.’ In terms of availability, zinc is the 24 th  most abundant element found in the Earth's crust and it has five stable isotopes. The most common zinc ore is sphalerite (zinc blende), which is a zinc sulfide mineral. Andreas Sigismund Marggraf, the German chemist, first discovered the pure metallic zinc in 1746. Interestingly, alchemists burned zinc in the air and form something different thing and they named that  "philosopher's wool"  or " white snow ." Salient Features of Zinc Zinc’s color is bluish-white and it is lustrous and diamagnetic metal. Zinc metal is normally hard and brittle; however, at when the temperature increases from 100 0 C, it becomes malleable. When temperature increases 210 0 C, then the zinc metal again becomes brittle and can be pulverized easily by beating. Zinc is a conductor of ele...

explain the element platinum

Chemistry - Platinum Introduction Platinum is a malleable, ductile, dense, and highly unreactive chemical element. The symbol of platinum is  ‘Pt’  and its atomic number is  ‘78.’ The name of platinum is derived from a Spanish term i.e. ‘platina,’ which means " little silver ." Platinum is the most precious and the rarest metal (element) on the earth. Salient Features of Platinum Following are the important features of the platinum − Platinum is a silver white metal. Platinum is an element of group 10 of the periodic table. Platinum is one of the rarest elements in the crust of the earth. Platinum is one of the least reactive elements. Platinum has six natural isotopes. Platinum is one of the most highly valuable and precious metals. Platinum is characteristically resists corrosion in all conditions. Because of this reason, it is considered as noble metal. Platinum is normally insoluble in nitric and hydrochloric acid, but dissolves in hot  aqua regia . After dissolv...

explain the element copper

Chemistry - Copper Introduction Copper is a soft, ductile, and malleable metal. Copper has very high thermal and electrical conductivity. The symbol of copper is  ‘Cu’  and atomic number is  ’29.’ Copper is known to people since (about) c. 8000 BC. Copper is the first metal, which was smelted from its ore around c. 5000 BC. Salient Features of Copper Copper was the first metal that cast into a shape (in a mold). Copper was the first metal that successful alloyed with another metal, e.g. copper alloyed with tin and resultantly bronze is prepared. It is done about c. 3500 BC. First metal to be purposefully alloyed with another metal, tin, to create bronze, c. 3500 BC. Copper has a natural reddish-orange color; it is visible once the its surface is exposed. Copper is a very good conductor of electricity and heat. Copper is an element of group 11 of the periodic table. Copper normally does not react with water; however, it does react slowly with atmospheric oxygen and form a ...

explain the element iron

Chemistry - Iron Introduction Iron is the most common element found in largely in outer as well inner core of the earth. The symbol of iron is  ‘Fe’  and atomic number is  ‘26.’ Iron is one of the earliest known elements that is being used by human beings. Salient Features of Iron Following are the major features of iron − Pure iron element is soft, ductile, and malleable. The boiling point of iron ranges between 1533 0 C and 2450 0 C. Iron easily gets attracted towards magnet. In dry air, iron remains inactive and does not react (with air); however, in moist air, it reacts and forms rust. Pure iron normally does not react with pure water; however, it reacts easily with ordinary of polluted water and rust forms. Iron reacts with halogen and Sulphur to form halide and sulphide accordingly. Occurrence of Iron The inner and outer cores of the earth are largely made up of iron and nickel. Most likely, iron is the most abundantly available element of the earth; however, it is ...

what is magnesium

Chemistry - Magnesium Introduction Magnesium is a shiny gray solid element. The symbol of magnesium is  ‘Mg’  and atomic number is  ‘12.’ With approximately 80% of the world market share, China is the largest supplier of magnesium. Salient Features of Magnesium The density of magnesium is two-thirds the density of aluminum. Among all the alkali metals of the Earth, magnesium has lowest melting point (i.e. about 1,202 0 F) and lowest boiling point (about 1,994 0 F). Magnesium usually reacts with water at room temperature. Sometimes, magnesium is also used as an igniter for thermite. Magnesium, when burns in air, produces a brilliant-white light, which also includes strong ultraviolet wavelengths. Magnesium, when burns, it produces intense bright and white light (see image given above). Occurrence of Magnesium By mass, magnesium is the eighth-most-abundant element found in the Earth's crust. Magnesium is found usually in large deposits of magnesite, dolomite, and other such...

What are some hot topics in waec chemistry?

Some Chemistry  waec keypoints In 2022  We have prepared a more detailed keypoints for interested people, drop your whattsapp number to Get it now for free Amines have a characteristic fishy smell  The industrial preparation of HNO 3  is carried out using Ostwald's process Heavy chemicals are those chemicals used in large quantities in Industries. The most used chemical in industries is H 2 SO 4 . NaOH is used for making soap Fine chemicals are not produced in large quantities. However, they are produced with a high degree of accuracy, e.g AgBr. Fine chemicals include drugs. Thermite process is used for Welding broken ends of metal parts. Bessemer process is used for the production of steel Acheson process is used to produce Graphite Nigerian Crude oil is called sweet because of its low sulphur content. Alkanals can be oxidized but Alkanones cannot, why? It is because Alkanals have an oxidizable hydrogen atom attached to the carbonyl carbon but Alkanones do not. News...

How can I study for my chemistry Exam

  how to study chemistry by science question and answers Chemistry is one of those subjects that you either enjoy or despise. Chemistry is usually not a required course in high school, but rather an elective. Most reputable universities, on the other hand, require all undergraduate students to take at least one chemistry course in order to graduate. If you want to work in medical, engineering, or a branch of natural science, you'll almost certainly have to take at least one chemistry course before graduating. For most people, chemistry is a difficult topic, but it doesn't have to be. Here are some tips I have for you to make you study and pass any chemistry exam.          1.     Before going to class, review and study the material . a student studying In a traditional learning approach, students come to class, the lecturer explains the content, elaborates on key concepts, assigns additional readings and assignments, and the session closes. St...

understanding Coal and petroleum-Chemistry

Chemistry - Coal and Petroleum Introduction The resources, which are present in unlimited quantity in nature and are not likely to be exhausted by human activities, are known as  Inexhaustible Natural Resources . E.g. sunlight, air. The resources, which are present in limited quantity in nature and are likely to be exhausted by human activities, are known as  Exhaustible Natural Resources . E.g. forests, wildlife, minerals, coal, petroleum, natural gas etc. Exhaustible natural resources were formed from the dead remains of living organisms (fossils); therefore, these natural resources are also known as  fossil fuels . E.g. coal, petroleum and natural gas. Coal Coal is hard as stone and black in color. Coal is one of the fuels used to cook food. Coal is used in thermal power plants to produce electricity. Under high pressure and high temperature, the dead plants those got buried inside the Earth, got slowly converted into coal. Coal contains mainly ...

classification of elements

Classification Of  Elements Introduction There are about 115 elements have been known to us till today. Based on their properties, all the elements are arranged in order, known as periodic table. Johann Wolfgang Döbereiner, a German scientist, first attempted to arrange the elements in 1817. John Newlands, an English scientist, also attempted to arrange the then known elements (in 1866). John Newlands had followed the order of increasing atomic masses to arrange the elements. Newlands started with the element having the lowest atomic mass (such as hydrogen) and ended at thorium, which was the 56th element (at his time). Newlands’ arrangement of elements is known as “Law of Octaves,” as in his arrangement every eight element had the properties similar to that of the first. E.g. the properties of lithium and sodium were found to be the same. Sa (do) re (re) Ga (mi) Ma (fa) Pa (so) da (la) ni (ti) H Li Be B C N O F Na Mg Al Si P S Cl K Ca Cr Ti Mn Fe Co & N...

carbon and it's compound

Chemistry - Carbon and its Compounds Introduction Carbon plays very important roles for all living beings. The amount of carbon in the earth’s crust is merely 0.02%, which is available in the form of minerals such as carbonates, hydrogen-carbonates, coal, and petroleum. The presence of carbon in the atmosphere of the earth is 0.03%, in the form of carbon dioxide. Compounds of Carbon Almost all carbon compounds (except a few) are poor conductors of the electricity. The diamond and graphite both are formed by carbon atoms; however, the difference lies between them in the manner in which the carbon atoms are bonded to one another. In diamond, each atom of the carbon, is bonded to four other carbon atoms and form a rigid three-dimensional structure (see the image given below). In graphite, each atom of the carbon, is bonded to three other carbon atoms in the same plane, which gives a hexagonal array (see the image given below) − There is also difference in some physical structu...

metals and non metals 2

Chemistry - Metals and Non-Metals 2 Introduction A solid material, which is typically hard, malleable, shiny, fusible, and ductile, is known as metals. E.g. iron, copper, aluminum, magnesium, sodium, lead, zinc, etc. Normally, metals have good electrical and thermal conductivity. Metals, in their pure state, have a shining surface, known as  metallic luster . Metals can be beaten into thin sheets; this property is known as  malleability . The property of metals to be drawn into the thin wires is known as  ductility . E.g. gold is the most ductile metal. Silver and copper are the best heat conductor. Non-Metals The non-metals are normally found in either solids or gases states. However, bromine is an exception that found in liquid state. Some of the major examples of non-metals are carbon, sulphur, iodine, oxygen, hydrogen, etc. Facts of Metals and Non-metals All metals exist in the solid form at room temperature, except mercury. Gallium and caesium have very l...

metals and non metals

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 (SO 2 ) + Water (H ...

Acid, bases and salt.

Chemistry - Acids, Bases, and Salts Introduction We taste food sour and bitter, it is only because of presence of acids and bases respectively. Litmus Solution Litmus, which is extracted from lichen, has purple color (see the image given below), but the condition is when it is neither acidic nor basic, i.e. neutral. Litmus basically is a plant belongs to Thallophyta, and in chemical experiment, it is commonly used as an indicator. The substances, which odor changes in acidic or basic media, are known as  olfactory  indicators. Acid or Base in a Water Solution The hydrogen ions in HCl are produced because of the presence of water. Secondly, the separation of H +  ion from the HCl molecules cannot be done in the absence of water. The chemical formula is illustrated below HCl + H 2 O → H 3 O +  + Cl – Furthermore, hydrogen ions cannot exist alone, but they can exist in presence of water molecules. Therefore, hydrogen ions are shown as H + (aq) or hydronium i...

Chemical reactions and equations

Chemistry - Chemical Reactions & Equations Introduction A process in which one or more chemical substances react with other chemical substance and converted to one or more different substances is known as chemical reaction. Chemical Equation A chemical equation is the symbolic demonstration of a chemical reaction; it is represented through symbols and formulae. E.g. Magnesium + Oxygen = Magnesium Oxide Mg   +   O 2   =   MgO The substances magnesium and oxygen are known as reactants and the result of reaction, i.e., magnesium oxide is known as product. Remember,  the total mass of the elements present in the products of a chemical reaction has to be equal to the total mass of the elements present in the reactants. The number of atoms of each element always remains same, before and after the chemical reaction. Types of Chemical Reaction Following are the major types of chemical reaction − Combination Reaction Decomposition Reaction Displacement Re...