NCERT Solution for Class 9 Science Chapter 2
Is Matter Around Us Pure
NCERT Books for Session 2022-2023
CBSE Board and UP Board
Intext Questions
Page No-18
Questions No-1
Differentiate between homogeneous and heterogeneous mixtures with examples.
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A homogeneous mixture is a mixture having a uniform composition throughout the mixture. For example, mixtures of salt in water, sugar in water, copper sulphate in water, iodine in alcohol, alloy, and air have uniform compositions throughout the mixtures.
On the other hand, a heterogeneous mixture is a mixture having a non-uniform composition throughout the mixture. For example, composition of mixtures of sodium chloride and iron fillings, salt and sulphur, oil and water, chalk powder in water, wheat flour in water, milk and water are not uniform throughout the mixtures.
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A homogeneous mixture is a mixture having a uniform composition throughout the mixture. It has no visible boundaries of separation between its constituents. For example, mixtures of salt in water, sugar in water, copper sulphate in water, iodine in alcohol, alloy, and air have uniform compositions throughout the mixtures.
On the other hand, a heterogeneous mixture is a mixture having a non-uniform composition throughout the mixture. It has visible boundaries of separation between its constituents. For example, composition of mixtures of sodium chloride and iron fillings, salt and sulphur, oil and water, chalk powder in water, wheat flour in water, milk and water are not uniform throughout the mixtures.
Homogeneous Mixtures:
– Uniform Composition: Substances are uniformly dispersed at a molecular level, resulting in a consistent appearance without visible boundaries.
– Examples: Saltwater, air, and alloys like brass exhibit uniformity and consistency throughout, making it impossible to distinguish individual components with the naked eye.
Heterogeneous Mixtures:
– Non-uniform Composition: Components are visibly separate, leading to visible variations or distinct phases within the mixture.
– Examples: Mixtures such as salads, trail mix, and soil display visible differences between components, allowing for easy differentiation due to their uneven distribution.
These differences in uniformity and visibility define how substances are distributed within the mixtures, impacting their overall appearance and distinguishability of components.