Fill in the following blanks with suitable words: In a chemical reaction, the sum of the masses of the reactants and the products remains unchanged. This is called _________.
The lightest element is Hydrogen. Explanation:
Hydrogen is the lightest and the most plentiful element in the universe. Hydrogen, denoted by the symbol $H$, has an atomic number of one and joins with many otherelements to produce water, ammonia, hydrocarbons, acids and bases. Hydrogen has an atomic weight of $1.008$.
Fill in the blanks.
Formula of sodium carbonate is _______ and that of ammonium sulphate is _______.
Answer
Formula of sodium carbonate is $\underline {\mathrm{Na}_2 \mathbf{C 0}_{\mathbf{3}}}$ and that of ammonium sulphate is $\underline {\mathbf{N f U S 0}_{\mathbf{4}}}$.
Matter can neither be created nor be destroyed is law of __________.
Answer
Matter can neither be created nor be destroyed is law of law of Conservation of Mass. Explanation:
There is a scientific law called the Law of Conservation of Mass, discovered by Antoine Lavoisier in $1785$. The Law of Conservation of Mass tells us that matter is neither created nor destroyed during a chemical reaction. The Law of Conservation of Mass applies as the total mass of the products is equal to the total mass of the reactants.