Which statement is true for balanced chemical equations? a) chemical equations do not provide an accurate way of describing reactions. b) chemical equations are not recognizable by speakers of all languages. c) chemical equations provide a qualitative and quantitative description of a reaction. d) chemical equations provide only a qualitative description of a reaction. e) chemical equations state the reaction in words instead of abbreviations.

A chemical equation is an expression which is representative of the nature and the amount of substances that are involved in a given reaction. For example if we consider the formation of water, this can be expressed through a chemical equation as follows:

2H2(g) + O2(g) → 2H2O (l)

The information which can be deduced is two-fold:

1) It gives a qualitative description about the state/phase of the reactants and products

2) It gives a quantitative description i.e. the mole ratios of the reactants and products or the reaction stoichiometry.

Ans: C) Chemical equations provide a qualitative and quantitative description of a reaction.

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.