what is the difference between a pure substance and a homogeneous mixture? | Yahoo Answers
Homogeneous means the same or uniform throughout. Therefore, a homogeneous substance can either be a mixture or a pure substance. 1.A pure substance is a form of matter that has a fixed chemical composition and a distinct characteristic while a homogeneous mixture is a. Pure substances are composed of a single element or compound while homogeneous mixtures are composed of multiple different elements or.
Although there are two or more elements joined when forming a compound, these cannot be separated by any physical means. Rather, they can only be decomposed by chemical means.
Therefore, this makes a compound a pure substance. Homogeneous Mixture Mixture contains two or more substances, which are not chemically combined. They only have physical interactions. Since they do not have any chemical interactions, in a mixture, the chemical properties of the individual substances retain without change. However, the physical properties like melting point, boiling point can be different in a mixture compared to its individual substances.
Therefore, the components of a mixture can be separated using these physical properties.
For example, hexane can be separated from a mixture of hexane and water, because hexane boils and evaporates before water does. The amount of substances in a mixture can vary, and these amounts do not have a fixed ratio.PURE SUBSTANCES AND MIXTURES
Therefore, even two mixtures containing similar types of substances can be different, due to the difference in their mixing ratios. Solutions, alloys, colloids, suspensions are the types of mixtures.
Mixtures can be mainly divided into two as homogeneous mixtures and heterogeneous mixtures. A heterogeneous mixture has two or more phases and the components can be individually identified. A homogeneous mixture is uniform; therefore, the individual components cannot be separately identified. When allowed to stay undisturbed, the components of a homogeneous mixture do not settle down.
Difference Between Pure Substance and Homogeneous Mixture
Solutions and colloids are the two main categories of a homogeneous mixture. The components of a solution are mainly of two types, solutes and the solvent. Solvent dissolves the solutes and form a uniform solution. While a pure substance cannot be separated physically, the components of a homogeneous mixture can be separated through mechanical and thermal processes such as distillation, sifting, filtering, and crystallization.
The individual characteristics of each substance are kept even if they have formed other substances such as suspensions, solutions, alloys, and colloids. The properties of its pure substance components are displayed, and its composition is changed according to the proportion of its components.
What is the difference between a pure substance and a homogeneous mixture?
Water cannot be separated into hydrogen and oxygen but will only produce water vapor when distilled. Its appearance, density, and color are uniform throughout. Blood, on the other hand, can be separated into red and white blood cells and plasma. While pure substances have sharp melting and boiling points, meaning the temperature does not change until all its components have melted, the components of homogeneous mixtures melt at different temperatures.
A pure substance is a form of matter that has a fixed chemical composition and a distinct characteristic while a homogeneous mixture is a mixture of two or more compounds with compositions that are uniform or mixed together in such a way that they are indistinguishable from each other. A pure substance cannot be separated into two or more substances by any means while a homogeneous mixture can be separated into two or more substances through physical or mechanical processes such as distillation, filtration, or sifting.
While both a pure substance and a homogeneous mixture have uniform compositions throughout, it is impossible to extract the components of a pure substance while the pure substances that make up a homogeneous mixture can be extracted because they retain their properties even when mixed together. The components of a homogeneous mixture melt or boil at different temperatures while the temperature when boiling or melting a pure substance does not change until all the pure substances have boiled or melted.