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Solution: Based on the molecular diagram, classify each change as phys...

Question

Based on the molecular diagram, classify each change as physical or chemical.  

Video Transcript

Hey guys, based on the equation shown above we have to identify this as a chemical change or a physical change, remember in a chemical change we change the chemical bonds in a compound elements will be arranged differently, in a physical change it's just a change in our phase so we're going between solid, liquid and gas so if we take a look here remember that red spheres represent oxygen and the white spheres represent hydrogen so each molecule begins with 1 oxygen surrounded by 3 hydrogens if we look on the right side now the molecules are still the same it's still an oxygen and then you have hydrogens and actually it's 2 hydrogens not 3 its hydrogens all around the oxygen so these are water molecules so we're going to say here the bonds haven't changed so it doesn't represent a chemical change all that happens is that the water molecules have spaced themselves out even more so must have undergone some kind of phase change, maybe this was a solid to begin with the molecules have spaced themselves out even more so it's become maybe a liquid or a gas so this represents a physical change because the chemical makeup hasn't changed all that happens is the molecules have spaced themselves farther apart so remember if the bonds don't change it's a physical change.

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