Explain how matter can be classified into mixtures pure substances compounds and elements?

Answer 1

Matter is broken down into two main parts: mixtures and pure substances. A pure substance is something that is consistent throughout. This means that in this substance all the atoms or molecules are the same. Elements are a sub-unit of pure substances. All the atoms in elements are identical. They can be paired up to form molecules however the atoms must be the same. Ex. Hydrogen (H2), Nickel (Ni), Iron (Fe) are all elements, and thus would also be pure substances. Compounds are also a sub-unit of pure substances. A compound is made up of one type of molecule and the molecule is made up of different types of atoms. Salt (NaCl) is a compound, as is Water (H2O). Mixtures are collections of more than one type of molecule and/or atom. This can include solutions, such as salt water, suspensions which tend to be cloudy, and mechanical mixtures, such as raisin bran where the parts are readily visible and can be separated. Matter is broken down into two main parts: mixtures and pure substances. A pure substance is something that is consistent throughout. This means that in this substance all the atoms or molecules are the same. Elements are a sub-unit of pure substances. All the atoms in elements are identical. They can be paired up to form molecules however the atoms must be the same. Ex. Hydrogen (H2), Nickel (Ni), Iron (Fe) are all elements, and thus would also be pure substances. Compounds are also a sub-unit of pure substances. A compound is made up of one type of molecule and the molecule is made up of different types of atoms. Salt (NaCl) is a compound, as is Water (H2O). Mixtures are collections of more than one type of molecule and/or atom. This can include solutions, such as salt water, suspensions which tend to be cloudy, and mechanical mixtures, such as raisin bran where the parts are readily visible and can be separated. Ans. Various points of distinction between a chemical compound and a mixture are summarized below: Characteristics Pure substance or compound Mixture 1. Composition The elements in a compound are present in definite proportion by weight. The ingredients of a mixture may be present in varying ratio. 2.Homogeneity A compound is always homogeneous. A mixture may be homogeneous (solution) or heterogeneous. 3. Properties A compound has entirely different properties from those of its constituents. Properties of a mixture are of the properties of its constituents. 4. Separation The constituents of a compound cannot be separated by simple separation techniques. The constituents of. a mixture can be separated by simple methods. 5. Energy changes Energy in the form of heat, light or elec­tricity is either evolved or absorbed when a compound is formed. There is generally no energy change when a mixture is formed from its constituents. 6. Volume change At constant temperature and pressure, formation of a compound may involve either no change or large change in volume. At constant temperature and pressure, formation of a mixture involves either very little or no change in volume.

Answer 2

Matter is broken down into two main parts: mixtures and pure substances.

A pure substance is something that is consistent throughout. This means that in this substance all the atoms or molecules are the same.

Elements are a sub-unit of pure substances. All the atoms in elements are identical. They can be paired up to form molecules however the atoms must be the same. Ex. Hydrogen (H2), Nickel (Ni), Iron (Fe) are all elements, and thus would also be pure substances.

Compounds are also a sub-unit of pure substances. A compound is made up of one type of molecule and the molecule is made up of different types of atoms. Salt (NaCl) is a compound, as is Water (H2O).

Mixtures are collections of more than one type of molecule and/or atom. This can include solutions, such as salt water, suspensions which tend to be cloudy, and mechanical mixtures, such as raisin bran where the parts are readily visible and can be separated.

Matter is broken down into two main parts: mixtures and pure substances.

A pure substance is something that is consistent throughout. This means that in this substance all the atoms or molecules are the same.

Elements are a sub-unit of pure substances. All the atoms in elements are identical. They can be paired up to form molecules however the atoms must be the same. Ex. Hydrogen (H2), Nickel (Ni), Iron (Fe) are all elements, and thus would also be pure substances.

Compounds are also a sub-unit of pure substances. A compound is made up of one type of molecule and the molecule is made up of different types of atoms. Salt (NaCl) is a compound, as is Water (H2O).

Mixtures are collections of more than one type of molecule and/or atom. This can include solutions, such as salt water, suspensions which tend to be cloudy, and mechanical mixtures, such as raisin bran where the parts are readily visible and can be separated.

Ans. Various points of distinction between a chemical compound and a mixture are summarized below:

Characteristics

Pure substance or compound

Mixture

1. Composition

The elements in a compound are present in definite proportion by weight.

The ingredients of a mixture may be present in varying ratio.

2.Homogeneity

A compound is always homogeneous.

A mixture may be homogeneous (solution) or heterogeneous.

3. Properties

A compound has entirely different properties from those of its constituents.

Properties of a mixture are of the properties of its constituents.

4. Separation

The constituents of a compound cannot be separated by simple separation techniques.

The constituents of. a mixture can be separated by simple methods.

5. Energy changes

Energy in the form of heat, light or elec tricity is either evolved or absorbed when a compound is formed.

There is generally no energy change when a mixture is formed from its constituents.

6. Volume change

At constant temperature and pressure, formation of a compound may involve either no change or large change in volume.

At constant temperature and pressure, formation of a mixture involves either very little or no change in volume.

Answer 3

The term "substance" means a pure material that is made of the same matter.

Answer 4

Compounds and substances are considered frequently synonyms.

Answer 5

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