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CHEM 6A Chapter Notes - Chapter 3: Bromine, Lanthanide, Rare Earth Element

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7 Mar 2018

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CHEM 6A Full Course Notes

CHEM 6A Full Course Notes

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3. 1 new substances are formed in chemical reactions. Ex: sodium and chlorine produce sodium chloride. Chemical properties of product is not the same as reactants new substances formed in reactions. Water is liquid while hydrogen is gas. Reactants: substances that react with each other. All substances in elemental form are represented by symbol of element. Chemical reaction: representation by chemical formula of reactants. Lavoisier"s law of conservation of mass result of conversion of each type of atom involved in the reaction. Individual atoms of various types are neither created nor destroyed. Placing balancing coefficients in front of chemical formulas. Balancing by inspection: adjust the coefficients of chemical formulas on each side of the arrow such that the number of atoms of every element is the same on both sides. Write chemical formula and separate into reactants and products. Adjust the balancing coefficients so number of atoms on both sides is the same.

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Related Questions

I need just the answers for part A&C.. not hand writing!!!

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 â 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 + O2â 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 â 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, â PbO + 02 C. Ca + H2O â 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