Important difference CLASS 9

1. DIFFERENCE BETWEEN MIXTURE AND PURE SUBSTANCE

S. NO	CONTENT	MIXTURE	PURE SUBSTANCE
1	Composition	A mixture contains two or more different substances that are physically combined but not chemically bonded	A pure substance consists of only one type of element or compound. It has a uniform and consistent composition throughout
2	Properties	The properties of a mixture depend on the composition and the proportion of the substances that make it up	The properties of a pure substance are consistent and do not change under given conditions
3	Separation	The components of a mixture can be separated by physical methods, such as filtration, distillation, or chromatography.	A pure substance cannot be separated into other substances by physical means
4	Examples	Air (a mixture of gases), seawater (a mixture of water and dissolved salts), and soil (a mixture of various minerals and organic matter).	Oxygen (O₂), carbon dioxide (CO₂), water (H₂O), and iron (Fe)

2.difference between homogeneous mixture and heterogenous mixture

S.NO	CONTENT	HOMOGENEOUS mixture	HETEROGENEOUS mixture
1	Uniformity of Composition:	uniformly distributed	NOT uniformly distributed
2	Appearance:	Appears as a single phase or substance	Appears as multiple phases or substances.
3	Separation of Components:	The components are so well mixed that they can’t be separated easily by physical means.	The components are more easily distinguishable and can often be separated by physical methods
4	Examples:	Air (a mixture of gases like oxygen, nitrogen, etc.). Vinegar (acetic acid dissolved in water). Sugar water (sugar completely dissolved in water).	Pizza (you can see the different ingredients like cheese, sauce, and toppings). Oil and water (where the two substances do not mix and form separate layers). Cereal in milk (you can distinguish between the cereal and milk).

3. difference between colloidal solution and suspension solution ?

S. NO	CONTENT	COLLOIDAL	SUSPENSION
1	Particle Size:	The particles in a colloidal mixture are between 1 nanometer and 1 micrometer in size	The particles in a suspension are larger than those in a colloid, typically greater than 1 micrometer.
2	Appearance:	Colloids often appear homogeneous to the naked eye but are heterogeneous at the microscopic level.	Suspensions are heterogeneous mixtures, and you can easily see the particles suspended in the medium.
3	Stability:	Colloidal mixtures are stable and the particles do not settle over time due to the Brownian motion, which keeps the particles suspended.	Suspensions are unstable, and the particles will settle out over time unless the mixture is constantly stirred or agitated.
4	Examples:	Milk, fog, gelatin, paint, and whipped cream.	Muddy water, sand in water, and salad dressing.

4. Difference between element and compounds

S.NO	CONTENT	ELEMENT	COMPOUND
1	Composition:	An element is a pure substance that consists of only one type of atom.	A compound is a substance made up of two or more different types of atoms that are chemically bonded together.
2	Chemical Bonds:	here are no chemical bonds because it consists of only one type of atom	Atoms of different elements are chemically bonded through covalent or ionic bonds to form a compound.
3	Properties:	The properties of an element are characteristic of the type of atom it contains.	The properties of a compound are often very different from the properties of the elements that make it up.
4	Separation:	Elements cannot be chemically broken down into simpler substances.	Compounds can be broken down into their constituent elements or simpler compounds through chemical reactions.
5	Examples:	Iron (Fe), Helium (He), Carbon (C)	Salt (NaCl), Ammonia (NH₃), Methane (CH₄)