Balance the chemical equation: Fe + H 2 O → Fe 3 O 4 + H 2

The balanced chemical equation of the given reaction is as follows: 3 Fe + 4 H 2 O → Fe 3 O 4 + 4 H 2 Note: A chemical equation must always be balanced because the law of conservation of mass states that matter can neither be created nor be destroyed in a chemical equation. So the total mass of reactants must be equal to the mass of products formed i.e. the total number of atoms of each element should be equal on both the reactant and the product side.

Balance the chemical equation: H 2 + O 2 → H 2 O

The balanced chemical equation of the given reaction is as follows: 2 H 2 + O 2 → 2 H 2 O A chemical equation must always be balanced because the law of conservation of mass states that matter can neither be created nor be destroyed in a chemical equation. So the total mass of reactants must be equal to the mass of products formed i.e. the total number of atoms of each element should be equal on both the reactant and the product side.

Balance the chemical equation: BaCl 2 + Al 2 ( SO 4 ) 3 → BaSO 4 + AlCl 3

The balanced chemical equation of the given reaction is as follows: 3 BaCl 2 + Al 2 ( SO 4 ) 3 → 2 AlCl 3 + 3 BaSO 4 Note: A chemical equation must always be balanced because the law of conservation of mass states that matter can neither be created nor be destroyed in a chemical equation. So the total mass of reactants must be equal to the mass of products formed i.e. the total number of atoms of each element should be equal on both the reactant and the product side.

E M B I B E

Sciwise - A coursebook of Science>Materials>Chapter 7 - Physical and Chemical Changes>EXERCISE

Natasha Mehta Solutions for Exercise 7: EXERCISE

Author:Natasha Mehta

Natasha Mehta Science Solutions for Exercise - Natasha Mehta Solutions for Exercise 7: EXERCISE

Attempt the practice questions from Exercise 7: EXERCISE with hints and solutions to strengthen your understanding. Sciwise - A coursebook of Science solutions are prepared by Experienced Embibe Experts.

Questions from Natasha Mehta Solutions for Exercise 7: EXERCISE with Hints & Solutions

HARD

7th CBSE

IMPORTANT

Sciwise - A coursebook of Science>Chapter 7 - Physical and Chemical Changes>EXERCISE>Q 2

After burning a magnesium ribbon, ash A is collected. On dissolving substance A in water a solution B is formed. Write the name of substances A and B.