Did each solution imply a change in composition why why not
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Answer:
A mixture is matter that contains more than one pure substance and can be separated into its components by using physical techniques. The composition is variable and its properties are related to its individual components. In a mixture, the components retain their own chemical properties. An example of a mixture is the combination of rice and salt. Compare this to a compound.
A compound is a substance that contains two or more different elements with their atoms in a definite ratio. Compounds cannot be separated by physical techniques such as filtering. The composition is the same throughout. Water will always have two hydrogen atoms and one oxygen atom. If instead the ratio were two hydrogen atoms to two oxygen atoms, then the compound is no longer water (H2O), it is now hydrogen peroxide (H2O2). Elements in a compound are not just mixed together; they are bonded together in a specific way. The properties of a compound are usually very distinct from the properties of the individual elements that make the compound. For instance, sulfur, a yellow solid, combines with oxygen, an oderless gas, to form sulfur dioxide (SO2), which is a poisonous, colorless, pungent gas.
A solution is a special type of mixture that is homogeneous throughout. This means that the molecules or ions involved are so well mixed that the composition is uniform throughout the mixture. Think of salt-water. You cannot see salt within the water when it is fully dissolved, not even with the aid of a microscope. (This contrasts with a heterogeneous mixture in which you can identify the separate components. For example, a mixture of salt and sand is heterogeneous.)
A solvent is the component in a solution that is present in the largest amount. In a NaCl solution (salt-water), the solvent is water.
A solute is the component in a solution in the lesser amount. In a NaCl solution, the salt is the solute. A solution may contain more than one solute.