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Mixture
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- A mixture is formed when two or more elements or compounds are present without being chemically bonded together. The substances which have been mixed are not present in specific amounts or ratios like they are in a compound, e.g. two hydrogen atoms for each oxygen atom in water.
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A compound is a substance that contains two or more elements chemically combined in a fixed proportion. The elements carbon and hydrogen combine to form many different compounds. One of the simplest is called methane, in which there are always four times as many hydrogen atoms as carbon atoms.
- Homogeneous Mixtures
- Heterogeneous Mixtures
- How to Tell Whether A Mixture Is Heterogeneous Or Homogeneous
- Examples of Mixtures
- Not A Mixture
Homogeneous mixturesappear uniform to the eye. No matter how closely you examine them, you won't be able to see individual chemicals or ingredients in this type of mixture. Because they are uniform and consistent, they only consist of a single phase of matter—be it solid, liquid, or gas. The chemical composition is the same for any sample of the mi...
Heterogeneous mixturesare not uniform. If you take two samples from different parts of the mixture, they will not have an identical composition. You can use a mechanical method to separate components of a heterogeneous mixture (e.g., sorting candies in a bowl or filtering rocks to separate them from sand).
Sometimes classifying mixtures is obvious, especially if you can see different types of materials in a sample. For example, if you have a salad, you can see different sizes, shapes, and types of vegetables. In other cases, you need to look more closely to recognize the type of mixture. Any mixture that contains more than one phase of matter is hete...
Air is a homogeneous mixture. However, the Earth's atmosphere as a whole is a heterogeneous mixture. See the clouds? That's evidence the composition is not uniform.Alloys are made when two or more metals are mixed together. They usually are homogeneous mixtures. Examples include brass, bronze, steel, and sterling silver. Sometimes multiple phases exist in all...Mixing two solids, without melting them together, typically results in a heterogeneous mixture. Examples include sand and sugar, salt and gravel, a basket of produce, and a toy box filled with toys.Mixtures in two or more phases are heterogeneous mixtures. Examples include ice cubes in a drink, sand and water, and salt and oil.Technically, if a chemical reaction occurs when you mix two materials, it's not a mixture—at least not until it has finished reacting. For example, if you mix baking soda and vinegar, a chemical reaction occurs. Once the reaction has finished, the remaining material is a mixture. Similarly, if you mix ingredients to bake a cake, a chemical reaction...
A compound is a substance that contains atoms of two or more different elements, chemically joined together. For example, water is a compound of hydrogen and oxygen, chemically joined together.
Mixtures are made of two or more substances — elements or compounds — that are mixed physically but not chemically; they do not contain any atomic bonds. Comparison chart. Constituents of Compounds and Mixtures. Compounds are made up of elements, which are pure substances with only one kind of atoms.
Compound: two or more different atoms chemically bonded together. Molecule: two or more different or same atoms chemically bonded together. Element: one single atom. A mixture contains two or more substances (elements, lattices, molecules, compounds), that are not chemically bonded together.
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The law of constant composition can be used to distinguish between compounds and mixtures of elements: Compounds have a constant composition; mixtures do not. Water is always 88.8% O and 11.2% H by weight regardless of its source. Brass is an example of a mixture of two elements: copper and zinc.
