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Notes 6-2

Notes 6-2. Chemical Reactions. Chemical Formulas. The formula of a compound identifies the elements in the compound and the ratios in which their atoms are present. What Are Chemical Equations?.

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Notes 6-2

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  1. Notes 6-2 Chemical Reactions

  2. Chemical Formulas • The formula of a compound identifies the elements in the compound and the ratios in which their atoms are present.

  3. What Are Chemical Equations? • Chemical equations use chemical formulas and other symbols instead of words to summarize a reaction.

  4. Law of Conservation of Matter • Matter is neither created nor destroyed • *It is simply rearranged!

  5. Conservation of Matter • The law of conservation of matter states that in a chemical reaction, the total mass of the reactants must equal the total mass of the products.

  6. Balancing Chemical Equations • To describe a reaction accurately, a chemical equation must show the same number of each type of atom on both sides of the equation.

  7. Examples from your lab: • Acid + Base  Water + Salt • HCl + NaOH  H2O + NaCl • HCl + KOH  H2O + KCl

  8. Let’s try some! 3 3 ____ AlBr3 + ____ K  ____ KBr + ____ Al Count the atoms: 1 Aluminum atom 1 Potassium atom 1 Potassium atom 1 Aluminum atom 3 Bromine atoms 1 Bromine atom Is it balanced? No! Add coefficients to balance atoms: 1 Aluminum atom 3 Potassium atoms 3 Potassium atoms 1 Aluminum atom 3 Bromine atoms 3 Bromine atoms Is it balanced? YES!

  9. Let’s try some! ____ FeO + ____ PdF2 ____ FeF2 + ____ PdO Count the atoms: 1 Iron 1 Palladium 1 Iron 1 Palladium 1 Oxygen 2 Flourine 2 Flourine 1 Oxygen Is it balanced? YES! Do we need to add coefficients? NO!

  10. Let’s try some! 6 4 ____ P4 + ____ Br2 ____ PBr3 Count the atoms: 4 Phosphorus 2 Bromines 1 Phosphorus 3 Bromines Is it balanced? No! Add coefficients to balance atoms: 4 Phosphorus 12 Bromines 4 Phosphorus 12 Bromines Is it balanced? YES!

  11. Let’s try a harder one! 2 3 3 ____ CoBr3 + ____ CaSO4 ____ CaBr2 + ____ Co2(SO4)3 Count the atoms: 1 Co 1 Ca 1 Ca 2 Co 3 Br 1 S 2 Br 3 S 4 O 12 O Is it balanced? No! Add coefficients to balance atoms: 2 Co 3 Ca 3 Ca 2 Co 6 Br 3 S 6 Br 3 S 12 O 12 O Is it balanced? YES!

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