What is the meaning of a value of –400 kj in a reaction? the reaction requires 400 kj of heat. the reaction releases 400 kj of heat. the products have 400 kj of heat energy more than the reactants. the reaction will not occur.

The reaction releases 400 kJ of heat.

Explanation:

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In this case, the meaning of such -400 kJ in a reaction aims to the released energy once the chemical reaction goes to completion, it means that -400 kJ are realsed in form of heat, therefore, the products have 400 kJ less energy than the rectants, considering the attached picture.

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the correct answer is b. a strong acid completely dissociates to its ions when dissolved in water. completely dissociates to and ions. a is incorrect because does not fully ionize to and ions and some remain as the compound . c and d are incorrect because, and do not fall into the category of bronsted lowry acids. a bronsted lowry acid is a proton donor and since both molecules do not have a proton to donate they are not bronsted lowry acids. likewise,   if we use the lewis acid definition, they cannot be acids. a lewis acid is an electron pair acceptor. both and have a complete octet so can not accept any electrons which disqualifies them as acids.