A chemical equation means :

representing chemical and physical properties of reactant molecules

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acquiring instructions for the preparation of a compound

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representing a chemical change with help of symbols and formulae

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showing the kind of elements present in a mixture

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Solution

The correct option is A representing a chemical change with help of symbols and formulae
A chemical equation is the symbolic representation of chemical reaction in the form of symbols and formulae, wherein the reactant entities are given on the left-hand side and the product entities on the right-hand side separated by an arrow showing the direction of the reaction.

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Similar questions

(a) In organic compounds, which part largely determines the physical and chemical properties.
(b) Write chemical equation to represent the reaction of ethanol with acidified solution of potassium dichromate.

Q. Statement I: Chemical formula represents the elements present in a compound.

Statement II: The chemical symbol

CO

and

Co

represent the same substance.

Q. Matter undergoes a change. The changes are of two types: Physical and chemical change.

A physical change is a change that involves only a change in the physical state of matter. Its chemical properties remain the same. Usually increasing the temperature or applying pressure or both bring about a physical change. On reversing the condition, that is reducing the temperature or reducing the pressure or both, the original state of matter is restored. In other words, physical changes are reversible.

A chemical change is a change that involves a change in the chemical composition of matter. A new substance is formed. In a chemical change, new chemical and physical properties of the substance are formed. In a chemical change, the chemical and physical properties of the substance formed will be different from the original substance.

In a chemical change, the properties that change are :

Consider the steps for the balancing of a chemical reaction. Identify the correct sequence.

(a) Check the correctness of the balanced equation.

(b) Make the list of number of atoms of different elements present in the unbalanced equation.

(d) Choose and balance the second element and so on.

(e) Start balancing from the compound which has more number of atoms and balance the first element.

(f) Write the symbols of physical states for compounds/ elements.

Match the physical state of elements or compounds to their symbols as used while writing chemical equations:

$\begin{matrix} Physical State & Symbol 1. Gas & (A) (s) 2. Solid & (B) (g) 3. Liquid & (C) (aq) 4. Dissolved in water (solution with water) & (D) (l) \end{matrix}$

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