Is Magnesium ribbon a mixture, an element, or a pure substance? Is Agua oxygenada a mixture, an element, or a pure substance?
The correct answer and explanation is:
Magnesium ribbon is a pure substance and specifically an element. Magnesium is a chemical element with the symbol Mg and atomic number 12. It consists entirely of magnesium atoms, making it a pure form of one type of atom. Since it is not combined with any other elements or compounds, it is not a mixture. The magnesium ribbon is usually used in chemical reactions, such as burning in air to produce magnesium oxide. Being an element, it cannot be broken down into simpler substances by chemical means.
Agua oxygenada, known in English as hydrogen peroxide (H₂O₂), is a pure substance but not an element. It is a chemical compound made up of hydrogen and oxygen atoms chemically bonded in a fixed ratio of two hydrogen atoms to two oxygen atoms. Because it has a definite chemical composition and distinct properties, hydrogen peroxide is classified as a pure substance. It is not a mixture because its composition is uniform throughout. It is used commonly as a disinfectant and bleaching agent. When it decomposes, it breaks down into water and oxygen gas, demonstrating it is a compound rather than an element.
In summary, magnesium ribbon is a pure substance that is an element composed of only magnesium atoms. Agua oxygenada (hydrogen peroxide) is a pure substance but a compound consisting of hydrogen and oxygen atoms chemically bonded together. Neither is a mixture because their compositions are uniform and well-defined, distinguishing them from mixtures which contain two or more substances physically combined without fixed proportions.