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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.
- 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.
Aug 22, 2019 · Mixtures are physical combinations of two or more elements and/or compounds. Mixtures can be classified as homogeneous or heterogeneous. Elements and compounds are both examples of pure substances. Compounds are substances that are made up of more than one type of atom.
When we mix two different pure substances together, like this, it’s a mixture. This is now a mixture of the elements iron and sulfur. The different elements are not joined together.
If two atoms and not same element, then compound and molecule and not mixture. If two different molecules and evenly mixed, then homogeneous mixture. If two different substances and differentiable on the molecular level, then heterogeneous mixture.
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.
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Compounds are two or more elements chemically combined in definite proportions by weight. Mixtures are two or more substances not chemically combined. Read on for a more thorough explanation of the properties of compounds and mixtures. The Basics – Molecules, Mixtures, & Compounds.
