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Answer : Methane 
does not has any resonating structures or isomers.
Explanation : Methane has tetrahedral geometry where all the valence bonds of carbon are satisfied with hydrogen atoms which are similar to each other. They also do not produce any lewis dot structure. Therefore, methane cannot have resonating structures.
The purpose of an experiment is to determine if the hypothesis is correct or incorrect
<h3>What is an experiment?</h3>
An experiment is a research or test conducted in order to prove or disprove a hypothesis.
An experiment can also be done to answer a question.
A hypothesis is an answer provided to explain an observation without conducting tests to back up the explanation given.
Therefore, an experiment is aimed at determining if a hypothesis is correct or not.
Learn more about experiments at: brainly.com/question/17274244
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An Explanation -
Why Ice Floats. A substance floats if it is less dense, or has less mass per unit volume, than other components in a mixture. For example, if you toss a handful of rocks into a bucket of water, the rocks, which are dense compared to the water, will sink. The water, which is less dense than the rocks, will float.
Answer: They're called Periods
