what is element?what is compound? what is mixture
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Answer:
Elements, compounds and mixtures
Element
A pure substance that is listed in the periodic table and only has one type of atom in it.
There are over 100 elements.
Most are metals, a few are metalloids (also known as semi-metals), and the rest are non-metals.
Compound
A pure substance made from more than one type of element chemically bonded together.
Elements bond in fixed ratios and so can be represented by a chemical formula. For example, sodium chloride has the same number of sodium ions and chloride ions, so its formula is NaCl, whereas water is always made from twice the number of hydrogen atoms as oxygen atoms, so it is H2O.
Mixture
An impure substance made from different elements or compounds mixed together that are not chemically joined.
Mixtures can usually be separated by physical techniques such as filtering and distillation.
Air is a mixture that contains the elements nitrogen, oxygen and argon, and also the compound carbon dioxide.
- In chemistry, an element is a pure substance which cannot be broken down by chemical means, consisting of atoms which have identical numbers of protons in their atomic nuclei. The number of protons in the nucleus is the defining property of an element, and is referred to as the atomic number.
- A chemical compound is a chemical substance composed of many identical molecules composed of atoms from more than one element held together by chemical bonds. A molecule consisting of atoms of only one element is therefore not a compound.
- In chemistry, a mixture is a material made up of two or more different substances which are physically combined. A mixture is the physical combination of two or more substances in which the identities are retained and are mixed in the form of solutions, suspensions and colloids.