Chemical formulas formula equation

When a reaction occurs between gaseous species or in solution, chemists usually express the reaction rate as a change in the concentration of the reactant or product per unit time. Recall, from your previous chemistry course, that the concentration of a compound (in mol/L) is symbolized by placing square brackets, [ ], around the chemical formula. The equation below is the equation you will work with most often in this section. 

What does it mean to write a chemical formula or equation Answering this question isn t as easy as it sounds because a chemical symbol can have different meanings under different circumstances. Chemists use the same symbols to represent both a small-scale, microscopic level and a large-scale, macroscopic level, and they tend to slip back and forth between the two levels without realizing the confusion this can cause for newcomers to the field. 

What does a chemical formula or equation mean at any particular time It means whatever you want it to mean depending on the context. The symbol H20 can mean either one tiny, invisible molecule or a vast collection of molecules large enough to swim in. 

Using chemical formulas, this equation looks like HOCH fCHOHj.CHO (aq) + SOH" (aq) HOCH tCHOHj.CO (aq) + 2Hp (I) + 2e ... 

Chemical Formulas, Chemical Equations, and Reaction Yields... 

We use this information, and our knowledge of writing chemical formulas and equations, to write the balanced chemical equation ... 

Steenberg E (2006) Investigation of the development of bridging students cognitive skills relevant to the use and understanding of chemical formulae and equations. Unpubhshed MSc (Science Ed) thesis, University of South Africa. 

There are ample self-made misconceptions regarding the formulation of reaction symbols. Mulford and Robinson [32] discovered the following situations regarding questions 5 and 6 (see Fig. 5.21) when evaluating the empirical studies Responses to question 5 suggest that students came to us with a very poor understanding of chemical formulas and equations. Only 11 % selected the correct answer d. When we consider the number of students who selected responses a, c and e, we see that 65% chose responses that do not conserve atoms. Combining responses a, b and e indicates that 74% appear not to understand the difference between the coefficient 2 and the subscript 3 in 2 S03 [32],... 

Chemical stoichiometry is the area of study that considers the quantities of materials in chemical formulas and equations. Quite simply, it is chemical arithmetic. The word itself is derived from stoicheion, the Greek word for element and metron, the Greek word for measure. When based on chemical formulas, stoichiometry is used to convert between mass and moles, to calculate the number of atoms, to calculate percent composition, and to interpret the mole ratios expressed in a chemical formula. Most topics in chemical arithmetic depend on the interpretation of balanced chemical equations. Mass/mole conversions, calculation of limiting reagent and percent yield, and various relationships among reactants and products are commonly included in this topic area. 

We use the quantitative information inherent in chemical formulas and equations together with the mole concept to predict the amounts of substances consumed or produced in chemical reactions. 

CHAPTER 3 Stoichiometry Calculations with Chemical Formulas and Equations... 

Chemistry is by nature an abstract subject. First, it relies on a symbolic language based on chemical formulas and equations. Second, it is based on the behavior of atoms and molecules—particles far too small to see. By presenting chemistry visually, the authors help you to "see" the chemistry you need to learn and increase your success in the course. 

---