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F. Chemical Reactions – process by which chemical changes occur; rearrangement of atoms.

F. Chemical Reactions – process by which chemical changes occur; rearrangement of atoms. Remember:. 6CO 2 + 6H 2 O + sunlight  C 6 H 12 O 6 + 6O 2. reactants – the substance(s) that undergo a chemical change . products – the substance(s) formed as a

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F. Chemical Reactions – process by which chemical changes occur; rearrangement of atoms.

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  1. F. Chemical Reactions – process by which chemical changes occur; rearrangement of atoms.

  2. Remember: 6CO2 + 6H2O + sunlight  C6H12O6 + 6O2 reactants– the substance(s) that undergo a chemical change products– the substance(s) formed as a result of the chemical change yields – forms

  3. endothermic endo = into reaction in which energy is transferred to the reactants and stored; gaining energy

  4. Remember: exothermic reactions exo = out of a reaction that releases energy to the surroundings; loses energy C6H12O6 + 6O2 6CO2 + 6H2O + energy energy released aerobic respiration

  5. In a chemical reaction: • bonds between atoms are broken • atoms remain intact • new bonds are formed • Conservation of Mass • Chemical Equation – a symbolic representation of a chemical reaction • Balanced Chemical Equation – same number of each type of atom on each side of equation.

  6. Guidelines for balancing equations: • Start with element that appear only once on each side of the equation • Work from left to right • Leave subscripts alone! • Only change numbers (coefficients) in front of the formulas • Coefficients of 1 are assumed and do not appear in balanced equation • Try to save Oxygen and Hydrogen to balance last • When done, CHECK your results

  7. Balancing equations KCl + NaOH NaCl + KOH 2 H2O2 H2O + O2 2 MgCl2 + AgNO3 AgCl + Mg(NO3)2 2 2

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