What Are Chemical Compounds Definition Types Bonding and Examples
A chemical substance is made up of several similar molecules composed of atoms from more than one element bound together by chemical bonds. There are four kinds of compounds, depending on how the component atoms are held together:
molecules held together by covalent bonds
ionic compounds held together by ionic bonds
intermetallic compounds held together by metallic bonds
Specific complexes held together by coordinate covalent bonds.
A chemical formula is a mode of conveying information about the parts of atoms that constitute a certain chemical compound, with the help of the standard abbreviations for the chemical elements, and subscripts to specify the number of atoms involved. For instance, water is made up of two hydrogen atoms bonded to one oxygen atom: the chemical formula is written as H₂O. Several chemical compounds have an exclusive numerical identifier allocated by the Chemical Abstracts Service (CAS):
A compound can be transformed into a different chemical conformation by interaction with a second chemical compound through a chemical reaction. In this method, bonds between atoms are broken-down in both interacting compounds, and then bonds are restructured so that new links are made between atoms.
Definition
Any material containing two or more different kinds of atoms (chemical elements) in a fixed stoichiometric ratio can be called as a chemical compound; the idea is most readily understood when considering pure chemical materials. It follows from their being made of a fixed ratio of two or more kinds of atoms that chemical compounds can be transformed, through a chemical reaction, into compounds or materials each having fewer atoms. The proportion of each element in the compound is expressed in a proportion in its chemical formula. A chemical formula is a mode of expressing information about the parts of atoms that constitute a specific chemical compound, using the standard acronyms for the chemical elements, and subscripts to show the number of atoms is involved. For instance, water is made up of two hydrogen atoms bonded to one oxygen atom: the chemical formula is written as H₂O. In the example compounds which are non-stoichiometric, the ratio can be reproducible about their production, and give a fixed ratio of their component elements, but proportions that are not essential [e.g., for palladium hydride, PdHx (0.02 < x < 0.58)].
Chemical compounds contain a unique and defined chemical configuration bind together in a definite three-dimensional arrangement by chemical bonds. Chemical compounds might be molecular compounds which are held together by covalent bonds, salts that are held together by ionic bonds, intermetallic compounds which are held together by metallic bonds, or the subset of chemical complexes that are bound together by coordinate covalent bonds. Chemical elements which are in pure form are usually not as considered chemical compounds, failing into having two or more atom requirement, though they often contain molecules made up of multiple atoms. Several chemical compounds have a distinct numerical identifier assigned by the Chemical Abstracts Service (CAS):
Types
1. Molecular Compound
Molecules bind together by covalent bonds.
A molecule is a neutral group (electrically) of two or more atoms seized together by chemical bonds. Molecules are separated from ions by their shortage of electrical charge. Nevertheless, in quantum organic chemistry, physics, and biochemistry, the word molecule is often used less severely, also being applied to polyatomic ions (having more than one atom).
In the kinetic theory of gases, the word molecule is often used for some gaseous particle regardless of its constituent. Giving to this definition, noble gas atoms are thought as molecules which are monatomic molecules.
A molecule can be homonuclear, that is, it only consists of atoms of one chemical element, as in case of with oxygen (O₂); or it could be heteronuclear, a chemical compound made of more than one element, example water (H₂O). Atoms and complexes linked by non-covalent interactions, like hydrogen bonds or ionic bonds, are usually not considered as single molecules.
A covalent bond develops H₂ (right) where two hydrogen atoms share the two electrons.
A covalent bond is a chemical bond that contains the distribution of electron pairs among atoms. These electron pairs are called bonding pairs or shared pairs, and the stable equilibrium of attractive and repulsive forces among atoms, when they distribute electrons, is called covalent bonding.
2. Ionic Compound
Ionic compounds that are held together by ionic bonds are called an ionic compound. In chemistry, an ionic compound is a chemical compound that is made up of ions which are held together by electrostatic forces called ionic bonding. The compound is completely neutral but be made of positively charged ions named cations and negatively charged ions termed as anions. These can be just ions such as in sodium chloride, the sodium (Na⁺) and chloride (Cl⁻) or polyatomic class such as in ammonium carbonate the ammonium (NH⁴⁺) and carbonate (CO₂⁻³) ions. Individual ions within an ionic compound usually have multiple closet neighbors, so are not be the part of molecules, but as an alternative a part of a continuous 3-d network, typically in a crystalline structure.
Ionic compounds comprising of hydrogen ions (H⁺) are categorized as acids, and those having basic ions oxide (O²⁻) or hydroxide (OH⁻) are categorized as bases. Ionic compounds without these ions are also called salts and that can be formed by acid-base reactions. Ionic compounds may also be formed from their constituent ions by vaporization of their freezing, precipitation, solvent, the electron transfer reaction or a solid-state reaction, of reactive metals with reactive non-metals, like halogen gases.
Ionic compounds normally have high boiling and melting points and are hard and weak. As solids, they are electrically insulating, but when liquefied or dissolved they become extremely conductive since the ions are mobilized.
3. Intermetallic Compounds
An intermetallic also recognized as an intermetallic compound, which is bound together by metallic bonds is a type of metallic alloy that forms a solid-state compound displaying distinct stoichiometry and ordered crystal structure.
4. Coordinate Compound
Certain complexes that are held together by coordinate covalent bonds. A coordination complex which is commonly metallic and is so-called the coordination center and a near array of bound molecules or ions, which are in turn, called complexing agents or ligands. Many metal-containing compounds, mainly those of transition metals, are coordination complexes. A coordination complex whose center is a metal atom is known as a metal complex.
Reactions
A compound can be transformed into different chemical constituents by interaction with a second chemical compound via a chemical reaction. In this method, bonds between atoms are broken down in both of the relating compounds, and then bonds are transformed so that new links are created between atoms.
This reaction could be called as AB + CD → AD + CB, where A, B, C, and D are each distinct atom; and AB, AD, CD, and CB are each unique compound.
FAQs on Chemical Compounds Structure Properties and Classification
1. What is a chemical compound?
A chemical compound is a pure substance made of two or more different elements chemically bonded together in a fixed ratio. Compounds have properties that are different from the elements that form them. For example:
- H2O (water) is formed from hydrogen and oxygen.
- NaCl (sodium chloride) is formed from sodium and chlorine.
2. What is the difference between an element and a compound?
The main difference is that an element contains only one type of atom, while a compound contains two or more different elements chemically combined. Key differences include:
- Element: Cannot be broken down by chemical means (e.g., O2, Fe).
- Compound: Can be decomposed into elements by chemical reactions (e.g., 2H2O(l) → 2H2(g) + O2(g)).
- Elements are represented by symbols; compounds by chemical formulas.
3. How are chemical compounds formed?
Chemical compounds are formed when atoms combine through chemical bonds to achieve stable electron configurations. They form by:
- Ionic bonding: Transfer of electrons (e.g., Na+ and Cl- forming NaCl).
- Covalent bonding: Sharing of electrons (e.g., H2O).
- Metallic bonding: Positive ions in a sea of delocalized electrons (e.g., Fe).
4. What is the formula of a chemical compound?
The chemical formula of a compound shows the types and number of atoms present in the smallest unit of the substance. For example:
- H2SO4 contains 2 hydrogen, 1 sulfur, and 4 oxygen atoms.
- CaCO3 contains 1 calcium, 1 carbon, and 3 oxygen atoms.
5. What are the types of chemical compounds?
Chemical compounds are mainly classified into ionic, covalent, and metallic compounds based on bonding. They include:
- Ionic compounds: Formed by electron transfer (e.g., NaCl, MgO).
- Covalent compounds: Formed by electron sharing (e.g., CO2, NH3).
- Organic compounds: Carbon-based compounds (e.g., CH4, C2H6O).
- Inorganic compounds: All other compounds (e.g., HCl, NaOH).
6. How do you name a chemical compound?
Chemical compounds are named using IUPAC nomenclature rules based on their composition and bonding. Basic rules include:
- Ionic compounds: Name the cation first, then the anion (e.g., NaCl is sodium chloride).
- Transition metals: Include oxidation state in Roman numerals (e.g., FeCl3 is iron(III) chloride).
- Covalent compounds: Use prefixes like mono-, di-, tri- (e.g., CO2 is carbon dioxide).
7. What is the difference between a compound and a mixture?
A compound is chemically bonded in a fixed ratio, while a mixture is a physical combination of substances in variable proportions. Key differences:
- Compound: Has a definite formula (e.g., H2O).
- Mixture: No fixed formula (e.g., air).
- Compound: Separated by chemical means.
- Mixture: Separated by physical methods like filtration or distillation.
8. How do you calculate the molar mass of a compound?
The molar mass of a compound is calculated by adding the atomic masses of all atoms in its formula. Steps:
- Write the chemical formula (e.g., H2O).
- Use atomic masses: H = 1.008 g/mol, O = 16.00 g/mol.
- Calculate: (2 × 1.008) + 16.00 = 18.016 g/mol.
9. Can you give an example of a chemical compound and its balanced reaction?
An example of a chemical compound is carbon dioxide (CO2), formed by the complete combustion of methane. The balanced equation is:
- CH4(g) + 2O2(g) → CO2(g) + 2H2O(l)
10. Why do chemical compounds have different properties from their elements?
Chemical compounds have different properties because chemical bonding rearranges electrons and creates new structures with unique characteristics. For example:
- Na is a reactive metal and Cl2 is a toxic gas.
- NaCl is a stable, edible crystalline solid.
