Skip to content

Chemical Bonding Essay Question

Metallic And Ionic Bonding Essay

Metals:

-Good conductors of electricity

-Good conductors of Heat

-Lustrous or reflective when freshly cut or polished

-Malleable ? can be shaped by beating

-Ductile ? can be drawn into a wire

-Exihibit a range of melting and boiling temperatures

-Generally have high densities

Exceptions in metals:

-Mercury ? liquid at room temperature, unusually low melting point.

-Chromium ? brittle rather than malleable.

Structure of Metals

Model of metal in solid state must be one in which:

-Some of particles are charged and free to move

-There are strong forces between particles throughout metal lattice

-Force that exist between charged particles: electrostatic force

Obtaining stability ?

Releasing one or more of outer shell (valence) electrons into a common pool within lattice. Atom is now a positive ion.

Metallic bonding model

-The only particles that are small enough to move through a solid lattice are electrons. If a metal atom loses one or more electrons it forms a positive ion.

-Ions: atoms or groups of atoms that have either gained or lost electrons and thus have a negative or positive charge.

-In ions, total number in protons differ from total number of electrons

-Cations: atoms that have lost electron to form + charge ions. (Metals)

-Anions: Atoms that have gained electrons form - charge ions. (Non-metals)

-Positive ions are arranged in closely packed structure.

oThis structure described as a regular, 3D lattice of positive ions. The ions occupy fixed positions in the lattice.

oThe much smaller electrons are free to move throughout the lattice.

?Called delocalised electrons

?Because they belong to lattice as a whole

?Delocalised electrons come from valence (outer) shell. (fig 3.5)

oElectrons that are not free to move throughout the lattice:

?Localised electrons

?Localised electrons in inner shell.

-The ions are held in lattice by attraction to delocalised electrons. This attraction extends throughout lattice and is called metallic bonding.

Metallic Bonding can be used to explain some properties of metals:

-Delocalised electrons in metallic lattice are free to move.

oIf source of electricity is supplied across metal, electrons are forced in one end and are able to flow out the other

o? Thus metals are good conductors of electricity.

-Delocalised electrons able to bump into one another and the cations able to transmit heat energy rapidly throughout the lattice

o? Thus metals are good conductors of heat

-Because of delocalised electrons in their lattice

o? metals reflect light and are lustrous

-Even when beaten into sheets or drawn into wires, delocalised electrons move so they still surround cations.

oElectrostatic forces of attraction may change but still operate through lattice

oLayers of...

Loading: Checking Spelling

0%

Read more

Hydrogen Bonding Essay.

747 words - 3 pages HYDROGEN BONDING:Hydrogen bonding is a bonding type consisting of dipole and dispersion forces. A hydrogen bond is the attractive force between a hydrogen atom attached to a molecule and an atom of a different molecule.According to the Pauling scale of electro-negativities of the elements, it can be viewed that the three most electronegative elements...

Hydrogen Bonding including BRIEF mentions to forces between non-metals and application of hydrogen bonding.

815 words - 3 pages Hydrogen bonding can simply be defined as a strong type of intermolecular dipole-dipole attraction in which hydrogen is attracted to nitrogen, oxygen or fluorine. However, this does not take into account the reasons behind the attraction or why dipole-dipole attraction occurs.Covalent molecular substances do not carry a whole...

covalent and ionic compounds

649 words - 3 pages Compounds are pure substances that contain atoms of two or more elements chemically combined in fixed ratios. In this lab, we observed two types of compounds, Ionic compounds and Covalent compounds. Ionic compounds are chemical compounds consisting of two or more ions that are held adjacent to each other by electrical attraction. “One of the ions, called an “anion,” has a negative charge, and the other is called a “cation,” and has a positive...

Chemical Bonds (Download PDF attachment for full document with pictures)

1961 words - 8 pages Formation of Compounds: The Existence of Minerals1.Almost all the Elements in the Earth’s Crust are found in the form of Compounds.2.Only a few Metals such as Gold, Silver and sometimes Copper are found as free Elements.3.Minerals are natural Elements or Compounds which have exact/precise/accurate and fixed/constant chemical composition/content.4.The above definition of Minerals can differentiate Minerals from Rocks...

Chemical Bonding Essay Question

526 words - 2 pages Bonds are the attraction between atoms involving the transferring and sharing of valence electrons to achieve stability and complete its valence shell. With these interactions of molecules, which are formed by bonds, properties of life emerge. Bonds vary in type, with each having their own specific properties, effects and strengths. These varying types of bonds consist of: covalent, ionic and hydrogen. A covalent bond is the chemical bonding in...

Identifying bond type with physical properties

1118 words - 4 pages Purpose: To determine the type of bonding in some unknown substances using smallest number of tests.Materials:goggles7 test tubestest tube racktest tube holderconductivity apparatusDI waterstir rodsscapulaswell plateBunsen burnerdilute

Chemistry year 11 Syllabus Summary

9998 words - 40 pages Module 1: The chemical Earth1. The living and non-living components of the Earth contain mixturesIdentify the difference between elements, compounds and mixtures in terms of particle theory•Homogenous means of uniform composition throughout, for example pure water, sugar, aluminium, petrol or whisky. Heterogeneous means having non-uniform composition where we can recognise small pieces of the material which are different from other...

Understanding The Electrolysis Process

2018 words - 8 pages What is Electrolysis? Electrolysis is a chemical change brought about by the passing of an electric current through a solution or melt. It is also used to produce alkalis and elements such as chlorine and hydrogen. The process involves the addition (oxidation) or subtraction (reduction) of ions in elements. The electric current motions the ions to proceed onto the electrodes. For example, the cations (positive ions) move to the negative electrode...

IB Chemistry - Intermolecular Bonding Essay:

1584 words - 6 pages Write an essay on intermolecular bonding. Explain how each type of bond arises and the evidence for the existence of each. Comment on their strengths in relation to the types of atoms involved; the covalent bond and relative to each other. Use the concepts of different types and strengths of intermolecular bonds to explain the following:There exists four types of intermolecular bonding, they include ionic, covalent, Van der waals and...

The Important Role of Hydrogen Bonds

930 words - 4 pages The Important Role of Hydrogen BondsHydrogen bonds are pretty much everywhere you go. You can't see them with the naked eye, but they have an important role in several biological structures that help sustain the life we know. In this paper I will define the hydrogen bond and explain the important role it has with the structure of DNA, the shape of proteins in the secondary and...

Atoms

654 words - 3 pages The beginning student of chemistry must have a knowledge of the theory which forms the basis for our understanding of chemistry and he must acquire this knowledge before he has the mathematical background required for a rigorous course of study in quantum mechanics. The present approach is designed to meet this need by stressing the physical or observable aspects of the theory through an extensive use of the electronic charge density. The...

Please, wait while we are validating your browser