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Question: life chemistry lab report elements of living organisms name the...

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Life Chemistry Lab Report

  1. Elements of Living Organisms
  2. Name the five most abundant elements found in the human body.
  1. Cells organize into tissues which work together to form                
  1. What is the difference between an atom and an element?
  1. Molecules
  1. Is glucose an atom or molecule? What are the atoms in glucose?

  1. How many bonds can oxygen form?

  1. Is C6H12O6 a molecular or structural formula? What is the name of this molecule?
  1. Based on lab, Section II, draw and label a ball and stick representation of a carbon dioxide, water and ethyl alcohol molecule. Use circles to designate atoms and lines for bonds, then indicate the chemical symbol for each atom. Sign, date and prepare an image of your drawing and include it with this lab report.
  1. Molecular Make Up of Living Organisms
  1. Name the four groups of organic molecules.
  1. _______ are the most abundant organic molecules in living organisms.
  1. Name a polysaccharide, monosaccharide, protein and a lipid.
  1. Go to the lab, Section 3, Exercises 2, 3, 4 and 5 to complete the following table:

Type of Organic Molecule

Reagent

Sample Tested

Positive Color

Negative Color

Carbohydrate (starch)

Iodine

Sugar

Benedict’s solution

Lipid (fat)

Sudan IV

Protein

Biuret

  1. Go to the lab, Section 3, Exercise 6 to locate starch in potato cells. Describe the microscopic appearance of starch in terms of color and location within the cells.

  1. Measurement of pH
  1. What substance has an equal number of hydrogen ions (H+) and hydroxide ions (OH-)?

  1. What is the pH of the above substance?

  1. How does the addition of hydroxide ions (OH-) affect the pH of your stomach?

  1. Go to lab, Section 4, Exercise 7 to test the pH of common solutions. Which solution tested had a pH closest to neutral? Which solution was most acidic?

Summary Questions

  1. What is the smallest subunit of carbohydrates?

  1. Which reagent could be used to test for diabetes?

  1. A member of your family has a high blood cholesterol count. You see “fat free” crackers in the grocery store and decide to test the product for the presence of lipids. How would this test proceed?

  1. A family member has been cautioned about eating foods high in sugar. Explain how a test could be run for the presence of sugar.

  1. Explain how to test for the presence of protein in milk.

  1. A friend complains of stomach acidity. Which substance tested might safely help relieve your friend’s symptoms?

  1. Explain how solutions are classified as acids or bases. Then, give an example of a weak acid.   

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