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Compounds. 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. Methane is a pure substance because it ...
- Chemical Formulas
A chemical formula is an expression that shows the elements...
- Chemical Formulas
Sep 21, 2022 · A combination reaction is a reaction in which two or more substances combine to form a single new substance. Combination reactions can also be called synthesis reactions. The general form of a combination reaction is: A + B → AB A + B → AB. One combination reaction is two elements combining to form a compound.
close. compound A pure substance made from two or more elements which are chemically bonded in a fixed ratio. and. mixtures. close. mixture When two or more compounds or elements are present ...
- 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...
As it stands, this is what I understand them to mean: Compound: two or more different atoms bonded together. Mixture: two or more different atoms together but not joined. Molecule: two particles (same or different) bonded together. Element: only 1 type of atom; this definition is applied to things both bonded and not to itself.
Jul 20, 2022 · For example, water is a compound composed of two hydrogen atoms bonded to one oxygen atom. We can show the ratio of hydrogen to oxygen in this compound by using subscripts on the chemical symbols for each element. Thus, water (two hydrogens and one oxygen) can be written as H 2 O. This shorthand notation for water is called a chemical formula.
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Jun 19, 2021 · Mixture - A mixture is when we have elements or compounds in a container or space and they are not bonded together. This means they are not joined and have not swapped or shared electrons. Instead they do not react together but mix and move around each other. An example of this is air in the classroom. This air is a mixture of oxygen, carbon ...
