Std 7th Science | chapter 14 | Elements, compounds and mixtures

سبق نمبر 14 عناصر ،مرکبات اور آمیزے Maharashtra Board fully animated video on chapter 14 Elements, compounds and mixtures. سوالات کے جوابات bit.ly/3GONTiL ٹیسٹ کی لنک forms.gle/xiVzJ4DmX844SQfA8 Elements, compounds and mixtures 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 (represented by the symbol Z). Chemical elements constitute all of the baryonic matter of the universe. A chemical compound is a chemical substance composed of many identical molecules (or molecular entities) 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. There are four types of compounds, depending on how the constituent atoms are held together: Elements, compounds and mixtures. molecules held together by covalent bonds ionic compounds held together by ionic bonds intermetallic compounds held together by metallic bonds certain complexes held together by coordinate covalent bonds. A chemical formula specifies the number of atoms of each element in a compound molecule, using the standard abbreviations for the chemical elements and numerical subscripts. For example, a water molecule has formula H2O indicating two hydrogen atoms bonded to one oxygen atom. Many chemical compounds have a unique CAS number identifier assigned by the Chemical Abstracts Service. Globally, more than 350,000 chemical compounds (including mixtures of chemicals) have been registered for production and use.  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. Mixtures are one product of mechanically blending or mixing chemical substances such as elements and compounds, without chemical bonding or other chemical change, so that each ingredient substance retains its own chemical properties and makeup. Despite the fact that there are no chemical changes to its constituents, the physical properties of a mixture, such as its melting point, may differ from those of the components. Some mixtures can be separated into their components by using physical (mechanical or thermal) means. Azeotropes are one kind of mixture that usually poses considerable difficulties regarding the separation processes required to obtain their constituents (physical or chemical processes or, even a blend of them). Elements, compounds and mixtures. 0:00 | Intro 1:12 | mater 4:02 | Elements 10:17 | compound 11:43 | mixtures 13:15 | method of distillation 14:24 | separation method 15:30 | method of centrifugation 17:01 | lon nigari #mater #Elements #compound #mixtures #methodofdistillation #separationmethod #methodofcentrifugation #lonnigari std 7th std 7th science std 7th science chapter 14 std 7th science chapter 14 Elements, compounds and mixtures.

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