Describe a chemical reaction in terms of moles of reactant or product The following three vids all address the mole.
A covalent bond is a shared pair of electrons. The bond between the two atoms of any diatomic gas, such as chlorine gas, Cl2, is certainly equally shared. The two chlorine atoms have exactly the same pull on the pair of electrons, so the bond must be exactly equally shared.
In cesium fluoride the cesium atom certainly donates an electron and the fluoride atom certainly craves an electron. The amount of pull on an atom has on a shared pair of electrons, called electronegativity, is what determines the type of bond between atoms. Considering the Periodic Table without the inert gases, electronegativity is greatest in the upper right of the Periodic Table and lowest at the bottom left.
The bond in francium fluoride should be the most ionic. Some texts refer to a bond that is between covalent and ionic called a polar covalent bond.
There is a range of bond between purely ionic and purely covalent that depends upon the electronegativity of the atoms around that bond. If there is a large difference in electronegativity, the bond has more ionic character. If the electronegativity of the atoms is more similar, the bond has more covalent character.
Lewis Structures Lewis structures are an opportunity to better visualize the valence electrons of elements. In the Lewis model, an element symbol is inside the valence electrons of the s and p subshells of the outer ring.
It is not very convenient to show the Lewis structures of the Transition Elements, the Lanthanides, or Actinides. The inert gases are shown having the element symbol inside four groups of two electrons symbolized as dots.
Two dots are above the symbol, two below, two on the right, and two on the left. The inert gases have a full shell of valence electrons, so all eight valence electrons appear. Halogens have one of the dots missing.
It does not matter on which side of the symbol the dot is missing. Group 1 elements and hydrogen are shown with a single electron in the outer shell. Group 2 elements are shown with two electrons in the outer shell, but those electrons are not on the same side.
Group 3 elements have three dots representing electrons, but the electrons are spread around to one per position, as in Group 2 elements. Group 4 elements, carbon, silicon, etc. Group 5 elements, nitrogen, phosphorus, etc. In only one position are there two electrons.
So Group 5 elements such as nitrogen can either accept three electrons to become a triple negative ion or join in a covalent bond with three other items. When all three of the unpaired electrons are involved with a covalent bond, there is yet another pair of electrons in the outside shell of Group 5 elements.
Group 6 elements, oxygen, sulfur, etc. Group 7 elements have all of the eight outside electrons spaces filled except for one.
The Lewis structure of a Group 7 element will have two dots in all four places around the element symbol except for one.Introduction I write problem sets, worksheets, tutorials at various times. In each case, there is some original context that makes the particular document "relevant".
Here are printable chemistry worksheets in pdf format. The first worksheet in each set asks you to name the chemical formula based on the chemical name.
The second worksheet asks for the chemical name based on the chemical formula. Answer keys are provided separately. Please review the FAQs and contact us if you find a problem.. Credits: 1. Prerequisite: Algebra 1, High School Biology. Recommended: 11th. Test Prep: CLEP This course covers the basic material for a high school chemistry course.
The CLEP covers two years worth of material. Those wishing to take the CLEP will have to do significant additional study.
Chemical formula writing worksheet with answers Over compounds to solve. Simple binary ionic compounds to polyatomic compounds. Printable pdf file.
Students should also have a Periodic table. Formula% Name% % Formula% Name% %CS 2% Carbon disulfide % %CCl 4% Carbon tetrachloride %CO% Carbon monoxide % %SO 3% Sulfur trioxide %N 2O 4% Dinitrogen tetroxide % %PCl Microsoft Word - Nomenclature and Formula Writing Worksheet metin2sell.com Author: Good, Brian.
Compound Names and Formulas Worksheet Three For the list on the left, name the compound. For the list on the right, give the chemical formula that corresponds to the name Name Formula 1) NaF 13) potassium fluoride 2) K2CO 3 14) ammonium sulfate 3) MgCl 2 15) magnesium iodide.