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: [[Salt]] is soluble. [[Sand]] is insoluble.
: [[Brick]] is opaque. [[Glass]] is '[[Transparent|transparent]]'.
: [[Metal]] is a good electrical conductor. [[Plastic (Material)|Plastic]] is a good electrical insulator.
: [[Metal]] is a good thermal conductor. Glass is a good thermal insulator.
: [[Iron]] is magnetic. [[Copper]] is not magnetic.