Describe a chemical reaction in terms of moles of reactant or product The following three vids all address the mole. The mole is not a concept we actually assess you on, but is a vital concept for you to understand for the rest of the unit. A collection of 11 videos vids 1,2,5,6 and 8 are most useful Simple mass, concentration, gas volume STP calculations - not involving a reaction no balanced equation needed Calculation flowchart for basic stoichiometric Q's - my version of a maths map for beginning Chemists.
A balanced 'picture' equation which helps you understand reading formulae and atom counting to balance the equation. The fully written out symbol equation with state symbols often optional for starter students.
For any reaction, what you start with are called the reactants, and what you form are called the products. So any chemical equation shows in some way the overall chemical change of It is most important you read about formula in an earlier section, but examples are explained on this page too.
In the equations outlined below several things have been deliberately simplified. This is to allow the 'starter' chemistry student to concentrate on understanding formulae and balancing chemical equations.
Some teachers may disagree with this approach BUT my simplifications are: The word 'molecule' is sometimes loosely used to mean a 'formula'.
The real 3D shape of the 'molecule' and the 'relative size' of the different element atoms is ignored. If the compound is ionic, the ion structure and charge is ignored, its just treated as a 'formula'. Always try to fit all the words neatly lined up from left to right, especially if its a long word equation.
Numbers in a formula are written as subscripts after the number of atoms of the element concerned e. If the number is 1 itself, by convention, no number is shown in a formula or before a formula.
Using numbers if necessary to balance the equation, this is a matter of 'trial and error'. If you seem deficient on one side of the equation in terms of a particular atom elementyou may need to increase a balancing number on the other side of the equation. Also, you must use the smallest possible whole numbers integers to balance an equation, its best to avoid half-numbers if you can.
If all is correct, then the sum of atoms for each element should be the same on both side of the equation arrow NEVER alter a formula to balance an equation!
You do need to be able to read and understand a formula and I've included some reminders and explanations in the examples of how to construct and balance the 7 chemical equations described and explained in detail below. When first learning symbol equations you probably won't use state symbols like s at first see end note.
Balancing equations example 3. Note the subscript 2 after the H in water means two atoms of that element. There is no need for any balancing numbers in this equation Balancing equations example 3. Without this 2 the atom count does not add up! The subscript 2 after the Cl in magnesium chloride means two atoms of that element.
You can only get the balance here by putting a 2 in front of the HCl formula because you need 2 Cl's to make the MgCl2. H2O example 2 or the formula CO2 means one molecule of the compound called carbon dioxide which is a chemical combination of one atom of carbon and two atoms of oxygen.
Oxygen is an element and the two products, carbon dioxide and water, are compounds. All the dashes represent the covalent bonds between the atoms in the molecules.
You can only get this to balance by having a 2 in front of the O2 and 2 in front of the CO2, you need an O2 to make CO2 and another O2 to convert the H4 into 2H2O Note the 2 before the O2 and H2O doubles the number of these molecules to balance the equation.Writing & Naming Formulas of Ionic & Covalent Compounds © - Douglas Gilliland The Physical Science Series ionic compound formula: (I)Write the symbols of the two elements.
(II)Write the valence of each as superscripts. determine the formulas of ionic compounds Do not use preﬁxes in the names. Ions form a . About This Quiz & Worksheet. Assess your knowledge of the composition of ionic formula compounds with this quiz and worksheet.
Jul 27, · The smallest unit of a molecular compound is a molecule. In an ionic compound is the molecular units, but there is a series of trusses or other units of the cations and anions, which we call the '"unity formula". Writing formulas for binary ionic compounds Binary ionic compounds, as the name suggests, are composed of two parts. (advanced level chemistry specification syllabus, H) PLEASE REMEMBER THAT YOU NEED TO REVISE ALL of the two years work for the final A Level Examination - anything can come up! Covalent Compound Naming Worksheet 1 monstermanfilm.com Naming Covalent Compounds Solutions Write the formulas for the following covalent compounds: 1) antimony tribromide SbBr3 2) hexaboron silicide B6Si 3) chlorine dioxide ClO2 4) hydrogen iodide HI 5) iodine pentafluoride IF5.
Assessments items will test you on several formulas and other. Naming and Writing Formulas for Acids! •1st –determine if the compound is an acid Formula Writing •Hydroiodic acid •Review naming and properties of ionic compounds.
•Properties of metal compounds •Ionic vs. covalent bonds •Homework: Ch 7 (section 2 &4) - 81, 82, Unit 2 Quiz--Naming Compounds: Multiple Choice (Choose the best answer.) Ionic Compounds. Molecular Compounds.
Organic Compounds. More than one of the above is correct. What is the formula for tetraphosphorus hexoxide? 4 P 7 O. P 4 O 7. P 4 O 6 (P) 4 (O) 7. None of these are correct. Chapter 7 Ionic Compound Naming (Practice Quiz) (with oxidation numbers and correct subscript latex codes).
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.