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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
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 reactions1
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
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
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 solutions1
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
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
slide8
Page 155
  • Section Assessment
  • #1-6
  • Due tomorrow
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