Is matter around us pure notes class 9, is matter around us pure hand written notes class 9

#science #science_notes it matters around us pure notes class 9, is matters around us pure hand written notes is matters around us pure notes class 9 pdf, is matters around us pure hand written notes pdf Now you can buy and download the complete PDF notes from here – perfect for quick revision and 💯 marks! https://rzp.io/rzp/5qByW2Qv अब आप यहाँ से पूरे चैप्टर की कम्प्लीट नोट्स की PDF खरीद सकते हैं और डाउनलोड कर सकते हैं – आसान रिवीजन और 💯 नंबरों के लिए बिल्कुल सही! https://rzp.io/rzp/5qByW2Qv 9 Class Science Chapter 2 Is Matter Around Us Pure ? Notes. Is matter around us pure notes, class 9 science chapter 2 notes. here we will be learn about MATTERS , Mixture , Solution , Concentration , Suspension , Colloidal solutions , Physical Properties , Physical Change , Chemical Change , Elements , Compounds etc.. Class 9 Science Chapter 2 Is Matter Around Us Pure ? Notes 📚 Chapter = 2 📚 Is Matter Around Us Pure ? MATTERS :-. 🔹Anything which occupies space and has mass is called matter.. 🔹 Matter can be divided in two categories.. ( I ) Pure Substance. ( II ) Impure Substances (Mixtures). ( I ) Pure Substance :-. 🔹  Pure substances means that all elements have same chemical properties. A pure substance is made up of same kind of elements.. Pure :- ‘Pure’ word means that there is no mixing in a substance. But according to scientific language all things are mixture of so many substances, not of single one. That’s why they are not pure. E.g. Milk, water, fat, etc.. Substance :- A substance is a kind of matter that cannot be separated into other kind of matter by any physical process. Apure substance is made up of same kind of elements.. What is a Mixture?. 🔹 It is a substance in which two or more substances (element or compound) are simply mixed together in any proportion. . 🔹 Examples :- The air is a mixture of oxygen, nitrogen, carbon dioxide and water vapour.. Types of Mixture :-. 🔹 Mixture is of two types : . Homogenous mixture . Heterogenous mixture. 🔶 Homogenous Mixture :- . 🔹 These types of mixtures have no visible boundaries of separation between the various constituents. . 🔹 Example :- Sugar in water. It has a uniform composition throughout its mass. . 🔶 Heterogenous Mixture :- . 🔹 These types of mixtures have visible boundaries of separation between the various constituents.. 🔹 Example :- Mixture of sugar and sand. It does not have a uniform composition throughout its mass.. Physical Properties. . ❇️ Physical Change :-. 🔹 When physical properties of a substance change it is known Physical Change. When we convert a substance from one state to another, such as a solid into a liquid or vice-versa, it is also a physical change as only the physical nature of the substance changes without affecting its chemical nature.. 🔹 For Example :- Change of ice into water. The chemical properties of water remain the same.. ❇️ Chemical Change :-. 🔹 When the chemical properties or chemical composition of a substance gets altered it is called a chemical change. It is also called as a Chemical Reaction. . 🔹 For Example :- Burning of paper. ❇️ Elements :-. 🔹 An element is the simplest form of matter. Elements cannot be broken down into further elements by chemical reactions. . 🔹 Elements are further characterized as Metals, Non-Metals and Metalloids. 🔶 Metals :- Silver, Mercury, Copper, Gold . Metals are lustrous (shiny) . Metals conduct heat and electricity . Metals have a silver-grey or gold-yellow colour . We can hammer metals and form thin sheets (Malleability) . We can convert metals into wires (Ductility). Metals always produce a ringing sound if they are hit (Sonorous). 🔶 Non-Metals :- Carbon, lodine, Chlorine, Oxygen, Hydrogen . Non-Metals do not conduct heat and electricity . Non-Metals are not sonorous, lustrous or ductile . Non-Metals have varied colours . 🔶 Metalloids :- Silicon, Germanium . They show some properties of metals and some of the non-metals.. ❇️ Compounds :-. 🔹 It is a substance that consists of two or more substances. These substances are combined chemically with each other in fixed proportions. The properties of a compound are different than that of its constituents. .