RBM 1107 : Bioscience for Paramedics 1 Learning outcomes notes

Consider the following balanced chemical reaction: 2 C_2H_4 + 7O_2 rightarrow 4 CO_2 + 6 H_2O How many moles of O_2 are required to react with 1 mole of C_2H_6? How many moles of CO_2 will be produced from 4 mole of C_2H_4 and 14 moles of O2? How many moles of C atoms are there in 1 mole of C_2H_6? How many moles of H atoms are there in 1 mole of C_2H_6? Please circle the correct answer: Which one of the following reactions is NOT balanced? 2 CO + 02 rightarrow 2 CO_2 2 SO_2 + O_2 rightarrow 2 SO_3 2KNO_3 + 10K rightarrow 5 K_2O + N_2 SF_4 + 3 H_2O rightarrow H_2SO_3 + 4 HF Consider the following equation: 2 Na + 2 H_2O rightarrow 2 NaOH + H_2 Identify the product(s) for this reaction. Na Na and H_2O NaOH NaOH and H_2 The total number of each type of atom must be the same on both sides of an equation in order to satisfy the Law of Combining Volumes. Law of Conservation of Matter. Law of Constant Composition. Law of Multiple Proportions. How many moles of

Science Tutor: Chemistry Name: Mixtures, Solutions, &Compounds: Chemical Equations Date Chemical Equations If a chemical symbol can be thought of as a letter and a chemical formula as a word in the language of chemistry, then a chemical equation is a statement or sentence. A chemical equation is a shorthand way of describing a chemical reaction between two or more substances. A "+ sign means "combines with." An arrow points away from the reactants and toward the products (See page 10), and an arrow means "yields." 2Na + Cl2 → 2NaCl means sodium combines with chlorine to yield sodiumn chloride (salt) Look closely at the equation above. Notice the "2" in front of NaCI on the right and Na on the left. That 2, called a coefficient, is necessary to make this equation balance. Remember Antoine Lavoisier? (Page 15) Matter is neither created nor destroyed in a chemical reaction. The same number of each kind of atom must be on both sides of a chemical equation. Because chlorine only exists as a molecule consisting of two chlorine atoms, it requires two atoms of sodium to yield two molecules of salt (NaCI). This illustrates another important law stated clearly by the French chemist Joseph-Louis Proust in 1799. Chemical compounds always combine in certain specific fixed proportions. Wherever sodium and chlorine combine, two atoms of sodium will be necessary to react with one molecule of gaseous chlorine. 1 . For the equation 2Mg + O2→ 2MgO + energy: A. List the reactant or reactants 2Hato B. List the product or products C. How many atoms of magnesium does it take to combine with one molecule of oxygen? D. How many molecules of magnesium oxide are produced in this reaction? 2. Hydrogen can combine with oxygen to produce water. We could write the equation like this: H2 + O2 → H2O. But this equation is unbalanced! Rewrite this equation with the correct coefficients so that an atom of oxygen doesn't disappear! (Be careful. If you add a coefficient to one side you may have to adjust the other. Count all the atoms.) 3. Now that you have the idea, balance the following equations: A, Pho, → PbO + 02 C. Ca + H2O → Ca(OH)2 + H2 How is following a recipe to mix up a batch of biscuits (or any other food item) similar to Proust's law for chemical reactions? 4. OMark Twain Media, Inc., Publishers 17