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Chemical Reactions, Mixtures and Solutions, Acids and Bases. Biology Chapter 6. Chemical Reactions. When bonds between atoms are formed or broken, causing a substance to combine and recombine as different molecules a chemical reaction occurs. A + B = AB AB = A + B. Chemical Reactions.

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Chemical Reactions, Mixtures and Solutions, Acids and Bases

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Chemical Reactions, Mixtures and Solutions, Acids and Bases

Biology

Chapter 6


Chemical Reactions

  • When bonds between atoms are formed or broken, causing a substance to combine and recombine as different molecules a chemical reaction occurs.

    A + B = AB

    AB = A + B


Chemical Reactions

  • Organisms have chemical reaction taking place over and over again in their bodies

  • Metabolism: all chemical reactions that occur within and organism

    • Breakdown and build important molecules for life


Mixtures vs Solutions

  • Mixture: combination of substances in which individual components retain their own properties

    • Beach sand

  • Solution: a mixture in which one or more substances are distributed evenly in another substance

    • Sugar and water


Mixture vs Solutions

  • In other words, a solution is when a solute is dissolved in a solvent and will not settle out of the solution

  • Solution terms:

    • Solutes: what is dissolved in the solvent

    • Solvents: what the solutes dissolve in


Mixtures vs Solutions

  • The more solute dissolved in a solvent the greater the solutions concentration

  • In our bodies, concentrations of dissolved substances need to stay within a certain narrow range in order for us to survive.

    • Ex. Pancreas produces insulin that keeps the amount of sugar dissolved in your bloodstream within a critical range


Acids and Bases

  • Chemical reactions can only happen when conditions are right

  • pH is the measure of how acidic or basic a solution is

  • 1-14 scale

  • Acidic

  • Basic


  • Page 155

  • Section Assessment

  • #1-6

  • Due tomorrow


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