Question

please give me a answer
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Answer 1

${\huge{\mathfrak\red{hy \:mate}}}$

your answer is givin attachment☺

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Answer 2

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$\underline\bold\green{answer- 1}$

Rusting of iron

$\underline\bold\green{answer- 2}$

a When Quick Lime reacts with Water we get Slaked lime[ Calcium Hydroxide] and enormous amount of heat is released.

So it is an exothermic reaction:

Chemical Equation :

Calcium oxide + water -------> Calcium Hydroxide + Heat

CaO(aq) +H2O(l) ------->Ca(OH)2 (aq)+Q

$\underline\bold\</strong><strong>g</strong><strong>r</strong><strong>e</strong><strong>e</strong><strong>n</strong><strong>{</strong><strong>a</strong><strong>n</strong><strong>s</strong><strong>w</strong><strong>e</strong><strong>r</strong><strong>-</strong><strong> </strong><strong>3</strong><strong>}$

2KI+Pb(NO3)2 --> 2KNO3+PbI2

$\underline\bold\</strong><strong>g</strong><strong>r</strong><strong>e</strong><strong>e</strong><strong>n</strong><strong>{</strong><strong>a</strong><strong>n</strong><strong>s</strong><strong>w</strong><strong>e</strong><strong>r</strong><strong>-</strong><strong> </strong><strong>4</strong><strong>}$

» Chemical reaction is a process in which one or more reactants are converted into products. The product may be one or more. The chemical reaction can involve an element or a compound which leads to the formation of product or products.

The observation which may be used to show that a chemical reaction has taken place may include;

1. Change in colour- Reaction of Bromine and ethene

( Br2(l) + C2H4⇒ CHBrCHBr)

2. formation of a precipitate- silver nitrate and NaCl

(AgNO3 (aq) + NaCl= AgCl(s) + NaNO3)

3. Temperature change

4. Change of smell