Two substances can be composed of the same chemical elements and still be different.The molecules represented below are all composed of carbon and hydrogen. But each kind of molecule makes up a different substance. These substances are different because their molecules have different numbers of carbon atoms and hydrogen atoms.First, select the model of a molecule composed of two carbon atoms and six hydrogen atoms.HCethane propene ethyne Next, select the chemical formula for the substance composed of these molecules.C2H6C2H2C3H6Submit

Select all the ways in which two substances can be different.Two substances can be composed of the same chemical elements, but the substances can have crystal structures with atoms that are arranged differently.Two substances can be composed of different chemical elements.Two substances can be composed of molecules that contain the same chemical elements but have different numbers of atoms of each element.Submit

Select the two models that represent molecules of substances with the same chemical formula but different arrangements of atoms.HCpropene propane cyclopropane 1-butene Complete the chemical formula for the two substances.If an atomic symbol has no subscript, leave the box next to the symbol blank.CH

Every substance can be represented by a chemical formula. The chemical formula tells you which chemical elements the substance is made of. In a chemical formula, each chemical element is represented by its atomic symbol.The models below represent molecules of three different substances. Each substance has a different chemical formula.Select the model that represents a molecule of the substance with the chemical formula ICl.HSClBrIiodine monochloride bromine hydrogen sulfide Submit

Two substances with crystal structures can be different even if the substances contain the same chemical elements in the same ratio. These substances have the same composition, but they are different because their atoms are arranged in different ways.Select the two models that represent substances with the same chemical formula but different arrangements of atoms.CSngraphite beta tin alpha tin Submit

How is a compound different from a mixture?AMixtures are created through physical changes; compounds are created through chemical reactions.BCompounds are created through physical changes; mixtures are created through chemical reactions.CMixtures, on average, are heavier than compounds.DCompounds, on average, are heavier than mixtures.