Element: Cannot be broken down into simpler substances, Copper wire (Cu), Gold (Au), Aluminum (Al), Nitrogen (N2), Heterogeneous Mixture: Not uniform throughout can be broken down by physical means, Trail mix, Pizza, Salad, Potting Soil, Compound: Can only be decomposed by chemical means, Salt (NaCl), Ice (H2O), Rust (Fe2O3), Baking Soda (NaHCO₃), Not Matter: Electricity, Light, Gravity, Time, Sound, Homogeneous Mixture: Uniform throughout can be broken down by physical means, Stainless Steel , Air , Salt Water, Coffee,

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