ScF2 +
KBr >
KE +
ScBr2

Balanced equation :

ScF₂ + 2KBr ⇒ 2KF + ScBr₂

Further explanation

Given

Reaction

ScF₂ + KBr ⇒ KF + ScBr₂

Required

Balanced equation

Solution

1. Give coefficient

ScF₂ + aKBr ⇒ bKF + cScBr₂

Sc, left=1, right=c⇒c=1

F, left=2, right=b⇒b=2

K, left=a, right=b⇒a=b⇒a=2

The equation becomes :

ScF₂ + 2KBr ⇒ 2KF + ScBr₂

Mgo2 is the oxidation state of manganese oxide

The density of water is 1 g/cm cubed and in order for the pebble to sink its density has to be greater than the density of water and in order for the twig to float its density has to be less than the density of water