| http://www.w3.org/ns/prov#value | - Most materials are mixtures:??? Air: Nitrogen (N2), Oxygen (O2), minor amounts ofother gasses??? Steel: Iron (Fe), Chromium (Cr), Nickel (Ni), Carbon(C)??? Seltzer: Water (H2O) and Carbon Dioxide (CO2)In fact, tap water is a mixture ??? it contains many things,typically around here carbonates (we have ???hard???water in this region). 19.
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