Question

HELP ASAP PLEASE, I'LL GIVE BRAINLIEST!!!!

Answer 1

Answer :

(1) The correct balanced chemical reaction is,  (D)

(2) The correct balanced chemical reaction is,  (C)

(3) The correct option is, (B)

(4) The correct option is, (C)

(5) The correct option is, (B)

Explanation :

Balanced chemical reaction : It is defined as the reaction in which the number of atoms of individual elements present on reactant side must be equal to the product side.

Part 1 :

The unbalanced chemical reaction is,

$Al+O_2\rightarrow Al_2O_3$

This reaction is an unbalanced chemical reaction because in this reaction number of aluminium and oxygen atoms are not balanced.

In order to balance the chemical equation, the coefficient '2' put before the $Al_2O_3$, the coefficient '3' put before the $O_2$ and the coefficient '4' put before the $Al$ then we get the balanced chemical equation.

The balanced chemical reaction will be,

$4Al+3O_2\rightarrow 2Al_2O_3$

Part 2 :

The unbalanced chemical reaction is,

$C_2H_6+O_2\rightarrow CO_2+H_2O$

This reaction is an unbalanced chemical reaction because in this reaction number of carbon , hydrogen and oxygen atoms are not balanced.

In order to balance the chemical equation, the coefficient '2' put before the $C_2H_6$, the coefficient '7' put before the $O_2$, the coefficient '4' put before the $CO_2$ and the coefficient '6' put before the $H_2O$ then we get the balanced chemical equation.

The balanced chemical reaction will be,

$2C_2H_6+7O_2\rightarrow 4CO_2+6H_2O$

Part 3 :

The given balanced chemical reaction is,

$Mg+H_2SO_4\rightarrow MgSO_4+H_2$

This reaction is a single replacement reaction in which the the more reactive element replace the less reactive element.

Part 4 :

The given balanced chemical reaction is,

$CaCO_3\rightarrow CaO+CO_2$

This reaction is a decomposition reaction in which the the larger molecule decomposes to give two or more smaller molecules.

Part 5 :

(A) $3Fe+2O_2\rightarrow Fe_3O_4$

This reaction is a synthesis reaction where multiple substances or reactants combine to form a single product.

(B) $BaCl_2+K_2CO_3\rightarrow BaCO_3+2KCl$

This reaction is a double replacement reaction where a positive cation and a negative anion of two reactants exchange places to form two new products.

(C) $NiCO_3\rightarrow NiO+CO_2$

This reaction is a decomposition reaction in which the the larger molecule decomposes to give two or more smaller molecules.

(D) $Cl_2+2NaBr\rightarrow 2NaCl+Br_2$

This reaction is a single replacement reaction in which the the more reactive element replace the less reactive element.

Answer 2

1: D
2: C
3: B
4: C
5: B