CHEMISTRY: TYPES OF MATTER
Around the world 2 categories of matter can be distinguished.
Homogeneous: Material that has a uniform composition throughout.
Homogeneous matter can contain more than one type of particle, but particles are uniformly distributed.
E.g. Sugar dissolved in water is a matter that contains both sugar and water but is homogeneous because the smallest particles that make up sugar and water are uniformly distributed.
Heterogeneous: Material that has varying compositions.
Heterogeneous materials are made up of parts with different chemical and physical properties. These parts are not uniformly mixed or dispersed.
E.g. A chocolate chip cookie has pieces of chocolate embedded in the cookie dough.
Matter can be divided into the major categories of pure substances and mixtures. Pure substances or homogeneous; mixtures can be either heterogeneous or homogeneous.
Pure substances
A sample of matter is pure substance if its composition is the same throughout the sample.
Pure substances have constant composition throughout a sample and from one sample to another.
The two types of pure substances are elements and compounds. Oxygen gas(element) and water(compound) are examples of pure substances.
Elements
Elements are substances that cannot be broken down or decomposed into simpler substances by chemical means.
Compounds
Compounds are composed of two or more elements that are chemically combined in definite proportions by Mass.
Substances in compounds do not retain their properties, the compound has its own properties.
Although all compounds contain at least two different types of atoms, the composition of a compound is the same throughout.
Mixtures: combinations of two or more pure substances that can be separated by physical means.
Mixtures are different from compounds because their composition is not definite/fixed and parts can be physically separated.
E.g. When sugar is dissolved in water, it doesn't disappear. If the water evaporates, the sugar is Left Behind; the water and sugar separate.
Substances in mixtures retain their properties
There are homogeneous and heterogeneous mixtures.
Around the world 2 categories of matter can be distinguished.
Homogeneous: Material that has a uniform composition throughout.
Homogeneous matter can contain more than one type of particle, but particles are uniformly distributed.
E.g. Sugar dissolved in water is a matter that contains both sugar and water but is homogeneous because the smallest particles that make up sugar and water are uniformly distributed.
Heterogeneous: Material that has varying compositions.
Heterogeneous materials are made up of parts with different chemical and physical properties. These parts are not uniformly mixed or dispersed.
E.g. A chocolate chip cookie has pieces of chocolate embedded in the cookie dough.
Matter can be divided into the major categories of pure substances and mixtures. Pure substances or homogeneous; mixtures can be either heterogeneous or homogeneous.
Pure substances
A sample of matter is pure substance if its composition is the same throughout the sample.
Pure substances have constant composition throughout a sample and from one sample to another.
The two types of pure substances are elements and compounds. Oxygen gas(element) and water(compound) are examples of pure substances.
Elements
Elements are substances that cannot be broken down or decomposed into simpler substances by chemical means.
Compounds
Compounds are composed of two or more elements that are chemically combined in definite proportions by Mass.
Substances in compounds do not retain their properties, the compound has its own properties.
Although all compounds contain at least two different types of atoms, the composition of a compound is the same throughout.
Mixtures: combinations of two or more pure substances that can be separated by physical means.
Mixtures are different from compounds because their composition is not definite/fixed and parts can be physically separated.
E.g. When sugar is dissolved in water, it doesn't disappear. If the water evaporates, the sugar is Left Behind; the water and sugar separate.
Substances in mixtures retain their properties
There are homogeneous and heterogeneous mixtures.
