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Examples of matter that exist as solids include ice, wood, and metal. Examples of matter that exist as liquids include water, oil, and milk. Examples of matter that exist as gases include oxygen, carbon dioxide, and nitrogen.
Examples: camphor, solid carbon dioxide.
Examples of solids in a chemical change include baking soda (sodium bicarbonate) turning into carbon dioxide gas and solid copper turning into copper sulfate solution when reacting with sulfuric acid.
Examples of solids that turn into liquids when heated include ice (solid water), candle wax, and butter.
Examples of rectangular solids include shoeboxes, shipping boxes, and refrigerators. These objects have six faces that are rectangles, and all their edges are right angles.