An example of a substance that can be decomposed by a chemical change is: a)silver b)water c)iron d)helium

Consider the elements bromine and chlorine; which elements has a larger ionic radius ?

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line

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