Examlex
Which of the following would be least useful in determining distances to other galaxies?
Reactions
Processes where chemical substances undergo a change to produce one or more different substances.
Methyloxirane
A three-membered epoxy ring molecule with a methylene group, used as a chemical intermediate in organic synthesis.
Ethylmagnesium Bromide
A Grignard reagent represented as C2H5MgBr, used in organic synthesis to form carbon-carbon bonds.
Aqueous Acid
An acid solution in which water is the solvent, capable of donating protons (H+ ions) in a reaction.
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