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Learning Objective
Pure SubstancesWhen we speak of a pure substance, we are speaking of something that contains only one kind of matter. This can either be one single element or one single compound, but every sample of this substance that you examine must contain exactly the same thing with a fixed, definite set of properties. Pure SubstanceElement or Compound?Consists of:Lead (Pb)elementlead atomsOxygen gas (O2)elementoxygen molecules*Water (H2O)compoundwater moleculesAmmonia (NH3)compoundammonia molecules*Note: pure oxygen gas consists of molecules but it is still considered an element, rather than a compound, as the molecules are made up of a single type of element. Compounds are made up of one or more element. MixturesIf we take two or more pure substances and mix them together, we refer to this as a mixture. Mixtures can always be separated again into component pure substances, because bonding among the atoms of the constituent substances does not occur in a mixture. Whereas a compound may have very different properties from the elements that compose it, in mixtures the substances keep their individual properties. For example sodium is a soft shiny metal and chlorine is a pungent green gas. These two elements can combine to form the compound, sodium chloride (table salt) which is a white, crystalline solid having none of the properties of either sodium or chlorine. If, however, you mixed table salt with ground pepper, you would still be able to see the individual grains of each of them and, if you were patient, you could take tweezers and carefully separate them back into pure salt and pure pepper. Heterogeneous mixtureA heterogeneous mixture is a mixture in which the composition is not uniform throughout the mixture. Vegetable soup is a heterogeneous mixture. Any given spoonful of soup will contain varying amounts of the different vegetables and other components of the soup. Homogeneous mixture/ SolutionA homogeneous mixture is combination of two or more substances that are so intimately mixed that the mixture behaves as a single substance. Another word for a homogeneous mixture is solution. Thus, a combination of salt and steel wool is a heterogeneous mixture because it is easy to see which particles of the matter are salt crystals and which are steel wool. On the other hand, if you take salt crystals and dissolve them in water, it is very difficult to tell that you have more than one substance present just by looking—even if you use a powerful microscope. The salt dissolved in water is a homogeneous mixture, or a solution (Figure \(\PageIndex{3}\)). Figure \(\PageIndex{3}\): Types of Mixtures © Thinkstock On the left, the combination of two substances is a heterogeneous mixture because the particles of the two components look different. On the right, the salt crystals have dissolved in the water so finely that you cannot tell that salt is present. The homogeneous mixture appears like a single substance. Example \(\PageIndex{3}\) Identify the following combinations as heterogeneous mixtures or homogenous mixtures.
Figure \(\PageIndex{4}\): A mixture of iron filings and sulfur powder (Asoult, Fe-S mixture 03, CC BY 4.0) Solution
Exercise \(\PageIndex{3}\) Are the following combinations homogeneous mixtures or heterogeneous mixtures?
Answers
Categorizing MatterFigure \(\PageIndex{1}\): Relationships between the Types of Matter and the Methods Used to Separate MixturesOrdinary table salt is called sodium chloride. It is considered a substance because it has a uniform and definite composition. All samples of sodium chloride are chemically identical. Water is also a pure substance. Salt easily dissolves in water, but salt water cannot be classified as a substance because its composition can vary. You may dissolve a small amount of salt or a large amount into a given amount of water. A mixture is a physical blend of two or more components, each of which retains its own identity and properties in the mixture. Only the form of the salt is changed when it is dissolved into water. It retains its composition and properties. Phase A phase is any part of a sample that has a uniform composition and properties. By definition, a pure substance or a homogeneous mixture consists of a single phase. A heterogeneous mixture consists of two or more phases. When oil and water are combined, they do not mix evenly, but instead form two separate layers. Each of the layers is called a phase. Example \(\PageIndex{1}\) Identify each substance as a compound, an element, a heterogeneous mixture, or a homogeneous mixture (solution).
Given: a chemical substance Asked for: its classification Strategy:
Solution:
Exercise \(\PageIndex{1}\) Identify each substance as a compound, an element, a heterogeneous mixture, or a homogeneous mixture (solution).
Example \(\PageIndex{2}\) How would a chemist categorize each example of matter?
SOLUTION
Exercise \(\PageIndex{2}\) How would a chemist categorize each example of matter?
SummaryMatter can be classified into two broad categories: pure substances and mixtures. A pure substance is a form of matter that has a constant composition and properties that are constant throughout the sample. Mixtures are physical combinations of two or more elements and/or compounds. Mixtures can be classified as homogeneous or heterogeneous. Elements and compounds are both examples of pure substances. Compounds are substances that are made up of more than one type of atom. Elements are the simplest substances made up of only one type of atom. Key Takeaways
Contributors
3.05: Pure Substances and Mixtures is shared under a not declared license and was authored, remixed, and/or curated by LibreTexts. Is water and oxygen a element?Hydrogen and oxygen are considered as elements which cannot split into different substances by applying any kind of energy like heat or electricity whereas water is a composed of constituents like hydrogen and oxygen in a fixed proportion and it can be split up by applying energy. So, it is not an element.
Which of the following substances is an element?Elements are mercury, iron, diamond, nitrogen, graphite, hydrogen, oxygen and chlorine.
Is carbon dioxide and water are elements?Water and carbon dioxide are examples of compounds.
Which of the following is an element oxygen or carbon dioxide?Hence, oxygen is an element. On the other hand, carbon dioxide (CO2) is made up of one atom of carbon and two atoms of oxygen. Hence, carbon dioxide is a compound.
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