What is empirical evidence? (4 points) a prediction of test results before an experiment a retest of experimental results to make them reliable a conclusion derived from evidence and logical reasoning knowledge gained by observation or measurement

  Knowledge gained by observation or measurement

Explanation: Empirical formula is the formula which is used to determine the basic molecular formula of any compound.

It is determine by the knowledge of the small small particularities of the elements present in the compound.

Thus emperical evidence is the knowledge gained by observation or measurement.

b..

is the correct one

explanation:

covalent bonds form as valence electrons are shared between two atoms. lewis structures and structural formulas are common ways of showing the covalent bonding in organic molecules. formal charge describes the changes in the number of valence electrons as an atom becomes bonded into a molecule.

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.