PPT-Moles and Chemical Formulae

Finding the Simplest Formula Finding the Simplest Formula Imagine you react 26512 g of Zn is reacted with excess Cl 2g When the Zn and Cl 2 have finished reacting a white powder is left and has a mass of 54512 g. HIGHER LESSON. Learning Objectives. To . explain. what chemical equations tell us about chemical reactions. To . explain. how we use equations to calculate masses of reactants and products. HIGHER LESSON. Stoichiometry. Quantitative Chemistry. Definitions. Stoichiometry. (. stoy. -. kee. -ah'-mi- tree) n.  . 1.The determination of proportions in which chemicals combine and weight relationships in chemical reactions.. HIGHER LESSON. Learning Objectives. To . explain. what chemical equations tell us about chemical reactions. To . explain. how we use equations to calculate masses of reactants and products. HIGHER LESSON. Stoichiometry I. Tom Hsu, PhD.. Manos . Chaniotakis. , PhD.. Marina Dang, PhD.. Copyright © 2012 . Chaniotakas. and Hsu. How do we define and measure chemical quantities?. Do we count atoms?. Do we count moles?. Stoichiometry. Stoichiometry. Goal. Calculate quantities of reactants and products needed in chemical rxns using balanced chemical equations.. Using an Equation as a Recipe . Ingredients: . F. rame, . Objectives. To learn how to write formulae for compounds. Outcome: you should be able to write the formulae for inorganic covalent compounds and ionic compounds comprising single atom ions or polyatomic ions.. Objectives. To learn how to work out the percentage composition by weight of a compound. To use percentage composition to work out empirical formulae. Percentage compositions. This means what percentage of each element is present in a compound, and therefore tells you what masses of each element are present in any given mass of a compound. . They tell us how much of each substance is involved in a chemical reaction. 2H. 2. + O. 2. .  2H. 2. O. 2 moles of hydrogen react with 1 mole of oxygen to make 2 moles of water. This is useful because now we can use it to work out what mass of hydrogen and oxygen we need and how much water is made. The Mole. REVISION. Formulae tell you how many of each atom are in a molecule.. Different atoms have different masses.. Level 4. NEW LEARNING. Formulae and balanced equations. Formula Mass and the mole. The Arithmetic of Equations. Section 1. Section 1 Learning Targets. 12.1.1 – I can explain how balanced equations apply to both chemistry and everyday life.. 12.1.2 – I can interpret balanced chemical equations in terms of moles, representative particles, mass, and gas volume at STP.. The Mole. 1 . dozen. eggs = 12 eggs. 1 . pair. of kings = 2 kings. 2 . pairs. of kings = 2 x 2 kings = 4 kings. 2 . dozen. eggs = 24 eggs. The Mole. 1 mole = 6.022 x 10. 23. things. Avogadro. ’. A. General Features of Physical and Chemical Changes. A chemical change (a . chemical reaction. ) converts . one substance into another.. Chemical reactions involve:. Breaking bonds in the . reactants . Chapter Objectives. Describe the chemical processes used in biomass production and conversion to biofuels.. Explain balancing a chemical reaction as an application of the . law of conservation of mass. What is the name of . CF. 4. ?. Tetracarbon monofluoride. Carbon tetrafluoride. Monocarbon tetrafluoride. Carbon trifluoride. What is the name of HCl?. Chlorous acid. Chlorate acid. Hydrochloric acid.