Define with examples 1 Significant figure 2 Chemical equation
Answers
Answer:
2MG + O2 gives rise to 2MGO
2HgO gives rise to 2H2+O2
To define significant figures and chemical equation with the help of examples :
(1) Significant figure - A significant figure is a digit in a number which has a value in the number, excluding the zeroes in the beginning of the number.
• This can be better understood with the help of an example.
In 0.003, the only significant figure is 3. The zeroes in the beginning are ignored as they do not add value to the number.
• Another example that can be considered is 3.030. Here, the number has 4 significant figures. The zeroes in this case are counted as they are in the middle and the end of the number.
(2) Chemical Equation - A chemical equation is the representation of the conversion of one or more reactants into one or more products.
• The reactants and products are always represented by their chemical symbols, with the reactants on the left and the products on the right side of an arrow (→).
• A chemical equation must always be written in a balanced form.
• For example :
2H₂ + O₂ → 2H₂O
In this chemical equation, H₂ and O₂ are the reactants here, and H₂O is the product.
The number of atoms of each element on the reactant side and the product side is same (H = 4, O = 2) . Therefore, the equation is balanced.