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What is substance Class 9 chemistry?
“A substance is a matter which has a specific composition and specific properties. ” Every pure element or pure compound is a substance. A substance can not be separated by any physical method. The properties/composition of a pure substance is fixed. Examples of substances are sugar as well as iron.
What is the class 9 structure of an atom?
An atom consists of a positively charged sphere with electrons embedded in it. An atom consists of a positively charged particles concentrated at the centre known as the nucleus. The size of the nucleus is very small as compared to the size of the atom. The electrons revolve around the nucleus in well-defined orbits.
What is chemistry for class 9?
Chemistry is the science that tries to understand the properties of substances and the changes that substances undergo. Class 9 Chemistry concepts deal with the understanding of basic constituents of matter, atoms and molecules.
Classification- On the basis of physical properties, matter is classified as solids, liquids and gases. On the basis of chemical properties, matter is classified as elements, compounds and mixtures.
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