We need to balance a skeltal chemical equation.” Give reason to justify the statement.
Answers
Answer:
Balanced chemical equation: A chemical equation in which the number of atoms of reactants are equal to the number of atoms of products is called a balanced equation.
We need to balance a skeletal chemical equation because:
i. According to the law of conservation of mass, mass (or atoms) are neither created nor destroyed in chemical reactions.
ii. It means the total mass of the products formed in chemical reaction must be equal to the mass of reactants consumed.
Answer:
A chemical equation consists of the chemical formulas of the reactants (the starting substances) and the chemical formula of the products (substances formed in the chemical reaction). The two are separated by an arrow symbol (→, usually read as "yields") and each individual substance's chemical formula is separated from others by a plus sign.
As an example, the equation for the reaction of hydrochloric acid with sodium can be denoted:
2 HCl + 2 Na → 2 NaCl + H
2
This equation would be read as "two HCl plus two Na yields two NaCl and H two." But, for equations involving complex chemicals, rather than reading the letter and its subscript, the chemical formulas are read using IUPAC nomenclature. Using IUPAC nomenclature, this equation would be read as "hydrochloric acid plus sodium yields sodium chloride and hydrogen gas."
This equation indicates that sodium and HCl react to form NaCl and H2. It also indicates that two sodium molecules are required for every two hydrochloric acid molecules and the reaction will form two sodium chloride molecules and one diatomic molecule of hydrogen gas molecule for every two hydrochloric acid and two sodium molecules that react. The stoichiometric coefficients (the numbers in front of the chemical formulas) result from the law of conservation of mass and the law of conservation of charge (see "Balancing chemical equations" section below for more information).
Common symbols
Symbols are used to differentiate between different types of reactions. To denote the type of reaction:[1]
"{\displaystyle =}=" symbol is used to denote a stoichiometric relation.
"{\displaystyle \rightarrow }\rightarrow " symbol is used to denote a net forward reaction.
"{\displaystyle \rightleftarrows }\rightleftarrows " symbol is used to denote a reaction in both directions.[3]
"{\displaystyle {\ce {<=>}}}{\displaystyle {\ce {<=>}}}" symbol is used to denote an equilibrium.[4]
The physical state of chemicals is also very commonly stated in parentheses after the chemical symbol, especially for ionic reactions. When stating physical state, (s) denotes a solid, (l) denotes a liquid, (g) denotes a gas and (aq) denotes an aqueous solution.
If the reaction requires energy, it is indicated above the arrow. A capital Greek letter delta ({\displaystyle \Delta }\Delta [5]) is put on the reaction arrow to show that energy in the form of heat is added to the reaction. The expression {\displaystyle h\nu }h\nu [6] is used as a symbol for the addition of energy in the form of light. Other symbols are used for other specific types of energy or radiation.
Balancing chemical equations
As seen from the equation CH
4 + 2 O
2 → CO
2 + 2 H
2O, a coefficient of 2 must be placed before the oxygen gas on the reactants side and before the water on the products side in order for, as per the law of conservation of mass, the quantity of each element does not change during the reaction
P4O10 + 6 H2O → 4 H3PO4