Law of Conservation Of Mass

The image shows a candle which has been burning for some time. How will you explain that the law of conservation of mass holds good here?

Calculate the mass of the reactant $\mathrm{A}$ in a reaction where the reactants $\mathrm{A}$ and $\mathrm{B}$ combine together to form a product $\mathrm{AB}$. The mass of $\mathrm{B}$ is $10 \mathrm{g}$ and the mass of $\mathrm{AB}$ is $24 \mathrm{g}$.

Calculate the mass of the product $\mathrm{B}$ in a reaction where the reactant $\mathrm{AB}$ decomposes completely into the products $\mathrm{A}$ and $\mathrm{B}$. The mass of $\mathrm{AB}$ is $35 \mathrm{g}$ and the mass of $\mathrm{A}$ is $22 \mathrm{g}$.

Give a suitable experiment to illustrate the law of conservation of mass.

Write the word equation for the following:

The reaction of vinegar and baking soda.

Write the word equation for the following:

The reaction of barium chloride with sodium sulphate.

Write the word equation for the following:

Combustion of magnesium in air.

What does the law of conservation of mass state?

The law of conservation of mass does not hold good when gases are consumed or evolved in a reaction.

The property which remains unchanged during a chemical reaction is _____.