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5 Written questions

5 Matching questions

  1. How does the hydrogen ion concentration compare between a solution of pH 6.4 and a solution of pH 8.42.
  2. Compare the characteristics of an acid, a base & a salt.
  3. Describe 4 types of chemical reactions.
  4. What does the pH scale measure?
  5. Distinguish between an ion and a polar molecule.
  1. a Synthesis: when 2 or more atoms, ions, or molecules bond to form a more complex structure A+B->AB
    Decomposition: bonds of a reactant molecule break to form simpler molecules, atoms, or ions AB->A+B
    Exchange: parts of 2 different types of molecular trade positions as bonds are broken and new are formed AB + CD-> AD+ BC
    Reversible: product or products can change back to reactant or reactants A+B<-> AB
  2. b tracks the number of decimal places in a hydrogen ion concentration without writing them out.
  3. c Ions: atom or molecule with an electrical charge.
    Polar: molecule in which the electrons and protons are not distributed symmetrically.
  4. d Acid: substance that releases hydrogen ion
    Base: substance that release ions that can combine with hydrogen ions
    Salt: substance formed by the reaction between and acid and a base.
  5. e The solution at pH 6.4 has 100 times the hydrogen ion concentration of a solution at pH 8.42.

5 Multiple choice questions

  1. Two atoms of hydrogen can combine with one atom of oxygen to produce a molecule of the compound water.
    Atoms of the same element combine, they produce molecules of that element.
  2. Chemistry of living organisms, a field of life science.
  3. Molecular: consists of the symbols of the elements in the molecule with numerical subscripts that indicate how many atoms of each element are present.
    Structural: representation of the way atoms bond in a molecule.
  4. Water
  5. they are chemicals that resist pH change. They combine with hydrogen ions when these ions are in excess or they donate hydrogen ions when these ions are depleted.

5 True/False questions

  1. Compare the chemical composition of carbohydrates, lipids, proteins, and nucleic acid.Acid: substance that releases hydrogen ion
    Base: substance that release ions that can combine with hydrogen ions
    Salt: substance formed by the reaction between and acid and a base.

          

  2. Explain the difference between saturated & unsaturated fats.Saturated: single carbon-carbon bond link all the carbon atoms; each carbon atom binds as many hydrogen atoms as possible & is thus saturated with hydrogen atoms.
    Unsaturated: have one or more double bond between carbon atoms. Fatty acids with one double bond.

          

  3. What are the functions of DNA and RNA?tracks the number of decimal places in a hydrogen ion concentration without writing them out.

          

  4. Where are electrons, protons, and neutrons located within an atom?the nucleus of an atom.

          

  5. What is likely to happen to a protein molecule exposed to intense heat or radiation?All proteins have a special shape and their shape determines what function they will perform. Proteins can become denatured or their shape can change and it'll cause the loss of function. Proteins exposed to heat will most likely become denatured and lose the ability to perform their task.