Achange in which one or more substances are converted into new substances is ?

A chemical reaction

Explanation:

A chemical reaction is a change in which one or more substances are converted into new substances. A reactant is one of the substances that react.

I think the answer is a Chemical Reaction.

Explanation: The definition of Chemical Reaction is, A process that involves rearrangement of the molecular or ionic structure of a substance, as opposed to a change in physical form or a nuclear reaction.

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.

metric time was an attempt to create a standard unit of time based off of 10, but it never took off an is not included in the metric system (si)