A group 14 element is to be converted into n-type semiconductor by doping it with a suitable impurity. To which group should this impurity belong ?

These type of semiconductors have excess electrons present in the lattice that are responsible for the conduction. These are formed when the group 14 elements like Silicon are doped with group 15 elements like P and As. The group 14 elements have 4 valence electrons and group 15 elements have 5 valence electrons . One

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Ionic solids , which have anionic vacancies due to metal excess defect , develop colour. Explain with the help of a suitable example.

When we add extra metal to the lattice, it provide extra electrons to the lattice and the anions of the lattice leave their lattice points . These vacant sites are occupied by the electrons. And the free electron can easily absorb energy and can jump to higher level. As these energy transitions are in visible

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Which of the following lattice has the highest packing efficiency? (i) simple cubic (ii) bodycentred (iii) hexagonal close packing.

Packing efficiency of all these kind of arrangements is given as follows. (i) Simple cubic :- Its packing efficiency is 52% . (ii) Body centred cubic :- Its packing efficiency is 68%. (iii) Hexagonal close packing:- Its packing efficiency is 74% . Conclusion :- From the above data we can conclude that hexagonal close packed

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Why are solids rigid ?

In case of solids the particles have strong forces of attractions between them . Due to this they can not move or change their positions. Due to this they are rigid.

what is the chemical formula for photosynthesis ?

Actually it is a process in which the green plants synthesize their food from the water and carbondioxide in the presence of sunlight and chloroplast. The following reaction depicts the chemical change during photosynthesis.

what kind of substance are alloys ?

Today we are in a modern era where a lot modernisation has took place. In the field of metals various metals are mixed to get the desired properties. The alloys are used in transportations , machines , telecommunications and a lot more. Basically the alloy is the homogenous mixture two or more metals and some

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How the atomic size changes when we move from left to right in a period in modern periodic table ?

The atomic Size is an important property that governs various behaviours of an atom or an element, like valency , electronegativity and metallic character. when we move from left to right the nuclear charge increases at every increase of atomic number. Due to increase in nuclear charge the electrons are attracted towards nucleus with more

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is burning a chemical change ?

Yes it is a chemical change as it involves the formation of ash and releases heat. Which can not be reversed to get fuel. In a chemical change the change of properties take place . For example we can write on paper and can fold it ,but if we burn it we get ash and

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how did mendeleev arrange chemical elements ?

Mandleev arranged the elements on the basis of increasing order of the atomic masses of the elements. He divided the 63 elements which were known or discovered at that time. There were 8 groups and 6 periods in his Periodic Table. Most importantly he made cards of every element , and wrote the reactions of

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Is it compulsory to read periodic classification of elements before chemical bonding or Can I start chemical bonding before periodic classification?

Actually chemical bonding is based on the Atomic number and electronic configuration. And the main thing is valency which is based on the number of outer(valence) electrons. Valency decides that how many bonds can be made by an atom . Thus if you ignore periodic table, you have to learn atomic number and electronic configuration

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The electrons that gain enthalpy for metals is positive and negative for non metals. Also, if metals are bigger in size than non metals then, how can electrons gain enthalpy is inversely proportional to the atomic size?

The answer is simple, like you are hungry you can pay more to get the food than that of the person who is less hungry, Similarily here the non metals want electrons thus they spend the energy more , or they release the energy. By this they lose the energy. So smaller is the size

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Is rusting a chemical change ?

Chemical change is a change in which a new substance is formed which is have totally new properties . And during rusting of iron, the iron oxide is formed that will not show the shine of metal, will not be a good conductor of electricity etc. thus rusting is a chemical change.

how do enzymes catalyze chemical reactions ?

The enzymes increase the surface area and makes it available for reactants to come closer and react. Thus this makes it easy for the reactants to react faster and thus the rate of chemical reaction increses.

how is the chemical symbol of an element determined ?

To determine the chemical symbol of an element we follow 2 main rules given below :- 1. The symbol of every element is expressed with capital letter. 2. If symbol includes more than one alphabet , then the first alphabet will be in capital case and second will be in lower case.

what happens to atoms in a chemical reaction ?

During a chemical change or chemical reaction , the new substances are formed with different properties. But, The atoms remain unchanged during a chemical reaction. Only their rearrangement takes place. As shown below :- 3Fe(s)  + 4 H2O(l) ——–> Fe3O4 (s) + 4 H2(g)

is burning wood a chemical change ?

Yes burning of wood is a chemical change as it leads to the formation of a new substance ash, which is chemically different from the wood. The chemical properties of ash are totally different from that of the wood.

what is a balanced chemical equation ?

A balanced chemical equation is the equation that is having equal number of atoms on both of the sides, that is on reactants side (Left Hand Side) and products side (Right Hand Side). Here in the following reaction we can see clearly 3Fe(s)  + 4 H2O(l) ——–> Fe3O4 (s) + 4 H2(g) For further clarification just click on

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Is melting of ice a chemical change ?

No , melting of ice will not be a chemical change as it simply involves the change in the state of water. But during this change the colour, odour, taste , chemical or molecular formula will remain the same . And these all are the indications of physical change only.

what is a chemical indicator ? And give its types.

Chemical indicators are the substances that give us the information about acids and bases by changing their own colour or smell. types of indicators :- Natural indicators :- These are the indicators that we get from the nature and are used as it is. For example :- Litmus and turmeric . Synthetic indicators :- These

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why do most atoms form chemical bonds ?

Kossel and Lewis in 1916 Developed the theory for the bond formation after watching the behavior of noble gases. The noble gases were inert in behavior and do not react with any substance. Kossel and Lewis found that the Octateof noble gases was complete so they do not react. They gave the theory that the

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How is energy involved in chemical and physical changes ?

Physical and chemical changes are associated with energy changes. For this we have to understand the type of changes. 1. Exothermic :- These are the changes that release energy when they occur . 2. Endothermic :- The changes that occur by absorbing the energy are the endothermic . In case of chemical change the reaction

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Hi, I’m Ankush Sharma. post graduate in chemistry and organic chemistry specialist

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