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While products like milk and salt are labeled as pure, they are actually mixtures from a scientific perspective. Pure substances, such as sodium chloride, consist of uniform chemical composition, whereas mixtures contain multiple substances with varied properties.
This section explores the definition of purity in substances, distinguishing between mixtures and pure substances. Everyday items like milk, ghee, and salt may be perceived as pure due to their market labels. However, scientifically, these products are mixtures of various components—milk is composed of water, fat, proteins, etc. In contrast, pure substances consist of only one type of particle, like sodium chloride (table salt) or sugar, which maintain consistent properties. Mixtures, such as soft drinks and soil, can be separated into their components, but the components of a pure substance cannot be physically divided further. This critical distinction underscores the importance of understanding material composition, impacting fields like chemistry and environmental science.
Pure Substances: These are materials that have a uniform composition and consist of only one type of particle.
Mixtures: Combinations of different pure substances that retain their individual properties and can be separated.
Separation Techniques: Methods such as evaporation and filtration that enable separating components of mixtures.
Pure as snow, with no other mix, a single form, it always sticks.
Once in a lab, a scientist named Sal tried to mix pure water with salt. The salt dissolved, making a solution. But when he heated it up, the water disappeared, leaving only salt—a true lesson on the difference between pure and mixed!
P is for Particle - Pure substances have one particle type! M is for Mix - Mixtures have many kinds!
Table salt (sodium chloride) as a pure substance consisting solely of Na and Cl.
Milk, which is a mixture of water, fat, proteins, etc.
Term: Pure Substance
Definition: A material made up of only one type of particle with uniform chemical composition.
A material made up of only one type of particle with uniform chemical composition.
Term: Mixture
Definition: A combination of two or more pure substances that retains individual properties.
A combination of two or more pure substances that retains individual properties.
Term: Sodium Chloride
Definition: A pure substance commonly known as table salt.
A pure substance commonly known as table salt.
Term: Evaporation
Definition: A process used to separate a soluble solid from a liquid by heating the liquid until it turns to vapor.
A process used to separate a soluble solid from a liquid by heating the liquid until it turns to vapor.