ANSWER THE PHOTO GIVEN BELOW
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Answer:
1.An exothermic reaction is a chemical reaction that releases energy through light or heat. It is the opposite of an endothermic reaction.
Expressed in a chemical equation: reactants → products + energy.
2.Fe2o3+2Al--->Al203+2Fe
This reaction is an example of 3) displacement reaction.
Here Aluminum is more reactive metal than Fe. Therefore Al will displace Fe from its oxide. This type of chemical reactions in which one of the element displace another is called as displacement reaction. Here less reactive metal is displaced by more reactive metal. Since one-time displacement is occurring, therefore, it is called as single displacement reaction.
Displacement reaction is applicable in both non-metals and metals.
3. 2N2o---->2N2+o2
decomposition reaction
4. Oxidation :
Oxidation is gain of oxygen.
Oxidation is the loss of electrons during a reaction by a molecule, atom or ion.
Oxidation occurs when the oxidation state of a molecule, atom or ion is increased. The opposite process is called reduction, which occurs when there is a gain of electrons or the oxidation state of an atom, molecule, or ion decreases.
An example of a reaction is that between hydrogen and fluorine gas to form hydrofluoric acid:
H2 + F2 → 2 HF
In this reaction, hydrogen is being oxidized and fluorine is being reduced. The reaction may be better understood if it is written in terms of two half-reactions.
H2 → 2 H+ + 2 e-
F2 + 2 e- → 2 F-
Note there is no oxygen anywhere in this reaction!
5. Reduction:
Reduction is loss of oxygen.
Reduction involves a half-reaction in which a chemical species decreases its oxidation number, usually by gaining electrons. The other half of the reaction involves oxidation, in which electrons are lost. Together, reduction and oxidation form redox reactions (reduction-oxidation = redox). Reduction may be considered the opposite process of oxidation.
Examples of Reduction
The H+ ions, with an oxidation number of +1, are reduced to H2, with an oxidation number of 0, in the reaction:
Zn(s) + 2H+(aq) → Zn2+(aq) + H2(g)
Another simple example is the reaction between copper oxide and magnesium to yield copper and magnesium oxide:
CuO + Mg → Cu + MgO
Answer:
7. Electrolysis, process by which electric current is passed through a substance to effect a chemical change. The chemical change is one in which the substance loses or gains an electron (oxidation or reduction). The process is carried out in an electrolytic cell, an apparatus consisting of positive and negative electrodes held apart and dipped into a solution containing positively and negatively charged ions. The substance to be transformed may form the electrode, may constitute the solution, or may be dissolved in the solution. Electric current (i.e., electrons) enters through the negatively charged electrode (cathode); components of the solution travel to this electrode, combine with the electrons, and are transformed (reduced). The products can be neutral elements or new molecules. Components of the solution also travel to the other electrode (anode), give up their electrons, and are transformed (oxidized) to neutral elements or new molecules. If the substance to be transformed is the electrode, the reaction is often one in which the electrode dissolves by giving up electrons.
8.A decomposition reaction is a type of chemical reaction in which a single compound breaks down into two or more elements or new compounds. These reactions often involve an energy source such as heat, light, or electricity that breaks apart the bonds of compounds.
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CaCO3----->CaO+CO2
even 3rd question is also an example of this reaction
9.A combination reaction is a reaction where two or more elements or compounds (reactants) combine to form a single compound (product).
Ba+F2⟶BaF2