Question

What do you mean by

1. precipitation reaction.

2. exothermic reaction

3. Oxidation reaction

write balanced chemical equation

Answer 1

Answer:heya

1. There are some chemical reactions in which a solid get separated from the solution. These processes are called precipitation reaction.

NaCl + AgNO3 --> AgCl + NaNO3

2. When heat is released by giving hot sensation in solution or in solution such reactions are called exothermic reactions.

CaO +H2O--> Ca(OH)2 + heat

3. Oxidation is defined as (i) the addition of oxygen to an element of compound or (ii) the removal of hydrogen from a compound.

2Ca +O2 --> 2CaO

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Explanation:

Answer 2

Concept Introduction:-

In the chemical reaction, one or more substances—also known as reactants—are changed into one may be more additional substances—also known as products.

Explanation:-

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$1$Precipitation reactions occur when cations and anions in aqueous solution combine to form an insoluble ionic solid called a precipitate.  A precipitate is a solid that forms out of a solution.

A common example is that of the mixing of two clear solutions: Silver nitrate $(AgNO_3)$ and sodium chloride $(NaCl)$:

$(AgNO_3)$$(aq)$$+$$(NaCl)$$(aq)$→$(AgCl)+NaNO_3$$(aq)$

The precipitate forms because the solid $(AgCl)$ is insoluble in water.

$2$ Exothermic reaction:

Chemical reactions that release energy in the form of heat, light, or sound are called exothermic reactions.

$2Na(s)+Cl_2(s)\rightarrow2NaCl(s)+energy$

$3$ Oxidation reaction: The reaction in which oxygen is gained or hydrogen is lost, is called oxidation reaction.

$2Cu+O_2\rightarrow 2CuO$

Final Answer:-

The correct answer is the reaction with the chemical equation.

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