![]() A) Selenium is one of the known elements.A) Aluminum oxide is a single, chemically pure compound.Hence a compact disc is not chemically pure.ī) The regions of different composition indicate that a compact disc is a heterogeneous mixture. A) A compact disc is a solid material that contains more than one element, with regions of different compositions visible along its edge.A) Orange juice contains particles of solid (pulp) as well as liquid it is not chemically pure.ī) Because its composition is not uniform throughout, orange juice is a heterogeneous mixture.It is usually separated from tea leaves by filtration.ī) Because the composition of the solution is uniform throughout, it is a homogeneous mixture. A) Tea is a solution of compounds in water, so it is not chemically pure.The chemical formula for water is H 2 O, which means each molecule of water consists of one oxygen atom chemically bonded to two hydrogen atoms. If its composition is uniform throughout, it is a homogeneous mixture. A compound forms whenever two or more atoms form chemical bonds with each other. If a substance is not chemically pure, it is either a heterogeneous mixture or a homogeneous mixture.If a substance can be separated into its elements, it is a compound. If it is pure, the substance is either an element or a compound. Which of the following term or terms could be used to describe this sample 1. A sample is composed completely of gold, absolutely free of impurities. Decide whether a substance is chemically pure. Is gold classified as an element, a compound, a homogeneous mixture, or a heterogeneous mixture Explain.aluminum oxide, a white powder that contains a 2:3 ratio of aluminum and oxygen atoms.Identify each substance as a compound, an element, a heterogeneous mixture, or a homogeneous mixture (solution). When oil and water are combined, they do not mix evenly, but instead form two separate layers. A heterogeneous mixture consists of two or more phases. By definition, a pure substance or a homogeneous mixture consists of a single phase. ![]() It retains its composition and properties.Ī phase is any part of a sample that has a uniform composition and properties. Only the form of the salt is changed when it is dissolved into water. A mixture is a physical blend of two or more components, each of which retains its own identity and properties in the mixture. heterogeneous mixture (milk is a colloid which is a type of heterogeneous mixture) 14K gold. You may dissolve a small amount of salt or a large amount into a given amount of water. Salt easily dissolves in water, but salt water cannot be classified as a substance because its composition can vary. All samples of sodium chloride are chemically identical. It is considered a substance because it has a uniform and definite composition. Ordinary table salt is called sodium chloride. \): Relationships between the Types of Matter and the Methods Used to Separate Mixtures
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