Compounds
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PRESENTED BY: S M OBAIDUL ARFIN. INSTRUCTOR: Ms. AFSHEEN KHALIL. PRESENTATION DATE: 30 SEPTEMBER, 2006.
All
substances have mass and therefore must be composed of atoms. These
atoms and how they assemble themselves in the substance determines their chemical and physical properties. Substances
can be classified according to how these atoms are assembled and is known as “Classification of Matter”. All
matter falls into one of three categories: elements, compounds or mixtures.
COMPOUNDS
A compound is a substance that is formed by chemically combining two or more elements. Water is formed when the elements hydrogen and oxygen combine. Its chemical formula, H2O, tells us the number and type of each atom in the compound, so water molecules contain 2 hydrogen atoms combined with 1 oxygen atom.
COMPOUNDS
Microscopic view of the molecules of the compound water (gas phase). Oxygen atoms are red and hydrogen atoms are white.
COMPOUNDS
Note that a compound: -consists of atoms of two or more different elements bound together, -can be broken down into a simpler type of matter (elements) by chemical means (but not by physical means), -has properties that are different from its component elements, -always contains the same ratio of its component atoms.
COMPOUNDS
Names of some compounds: - Carbon dioxide, - Ethanol, - Glucose, - Chlorophyll.
COMPOUNDS
Elements combine to form chemical compounds that are often divided into two categories. Metals often react with nonmetals to form ionic compounds. Nonmetals combine with each other to form covalent compounds, which exist as neutral molecules.
COMPOUNDS
Ionic Compounds Contain positive and negative ions (Na+Cl-). Solids such as table salt (NaCl). High melting and boiling points. Strong force of attraction between particles. Separate into charged particles in water to give a solution that conducts electricity.
Covalent Compounds Exist as neutral molecules (C6H12O2). Solids, liquids, or gases (C6H12O6(s), H2O(l), CO2(g)). Lower melting and boiling points (i.e., often exist as a liquid or gas at room temperature). Relatively weak force of attraction between molecules. Remain as same molecule in water and will not conduct electricity.
All
substances have mass and therefore must be composed of atoms. These
atoms and how they assemble themselves in the substance determines their chemical and physical properties. Substances
can be classified according to how these atoms are assembled and is known as “Classification of Matter”. All
matter falls into one of three categories: elements, compounds or mixtures.
COMPOUNDS
A compound is a substance that is formed by chemically combining two or more elements. Water is formed when the elements hydrogen and oxygen combine. Its chemical formula, H2O, tells us the number and type of each atom in the compound, so water molecules contain 2 hydrogen atoms combined with 1 oxygen atom.
COMPOUNDS
Microscopic view of the molecules of the compound water (gas phase). Oxygen atoms are red and hydrogen atoms are white.
COMPOUNDS
Note that a compound: -consists of atoms of two or more different elements bound together, -can be broken down into a simpler type of matter (elements) by chemical means (but not by physical means), -has properties that are different from its component elements, -always contains the same ratio of its component atoms.
COMPOUNDS
Names of some compounds: - Carbon dioxide, - Ethanol, - Glucose, - Chlorophyll.
COMPOUNDS
Elements combine to form chemical compounds that are often divided into two categories. Metals often react with nonmetals to form ionic compounds. Nonmetals combine with each other to form covalent compounds, which exist as neutral molecules.
COMPOUNDS
Ionic Compounds Contain positive and negative ions (Na+Cl-). Solids such as table salt (NaCl). High melting and boiling points. Strong force of attraction between particles. Separate into charged particles in water to give a solution that conducts electricity.
Covalent Compounds Exist as neutral molecules (C6H12O2). Solids, liquids, or gases (C6H12O6(s), H2O(l), CO2(g)). Lower melting and boiling points (i.e., often exist as a liquid or gas at room temperature). Relatively weak force of attraction between molecules. Remain as same molecule in water and will not conduct electricity.
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