THIS USER ASKED 👇
Bronze contains 90 to 95 percent copper and 5 to 10 percent tin. because these percentages can vary, bronze is classified as (1) a compound (3) a mixture (2) an element (4) a substance
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1) Pure substances have a definite chemical formula: the same type of atom with the same fixed ratios and chemical bonds. Therefore, the percentages of each element do not change.
2) Elements and compounds are pure substances. For example, Fe, Mg, Ti are elements, and CO₂, CO, H₂CO₃ are compounds. Each will always have the same type of atom, in the same ratio and with the same chemical bonds. Thus the percentages of the elements do not change.
3) Mixtures are formed by the physical combination (not chemical bonds) of different elements or compounds in varying proportions. As shown, this describes the material bronze, by virtue of its compositional change. Other examples of mixtures are solutions (such as brine), air, seawater, and milk: different trousers have different content of elements or compounds, different oceans and different milk.