How is it possible for two samples of hydrogen to contain the same number of atoms but have different weights
1. How is it possible for two samples of hydrogen to contain the same number of atoms but have different weights?
2. The element sulfur has an atomic number of 16 and an atomic weight of 32. How many neutrons are in the nucleus of a sulfur atom? Assuming that sulfur forms covalent bonds with hydrogen, how many hydrogen atoms could bond to one sulfur atom?
3. Which kind of bond holds atoms in a water molecule together? What attracts water molecules to one another?
4. In living cells, glucose, a six-carbon molecule, is converted into two three-carbon molecules by a reaction that releases energy. How would you classify this reaction?
5. If the product of a reversible reaction is continuously removed, what effect do you think its removal will have on the equilibrium?
6. As Quintin jumped on his bike and headed for the Long Pond (a freshwater lake), his mother called after him, “Don’t swim if we have a electrical storm–it looks threatening.” This was a valid request. Why?
7. Some antibiotics act by binding to certain essential enzymes in the target bacteria. (a) How might these antibiotics influence the chemical reactions controlled by the enzymes? (b) What is the anticipated effect on the bacteria? On the person taking the antibiotic prescription?
8. Mr. Howard, in a diabetic coma, has just be admitted to hospital. His blood pH indicates that he is in severe acidosis (low blood pH), and measures are quickly instituted to bring his blood pH back within normal limits. (a) Define pH and note the normal pH of blood. (b) Why is severe acidosis a problem?
9. After you eat a protein bar, which chemical reactions must occur for the amino acids in the protein bar to be converted into proteins in your body cells?
10. Analyzing a sample that contains an organic molecule, a biologist finds the following constituents: carbon, hydrogen, oxygen, nitrogen, and phosphorus. On the basis of this information, is the molecule a carbohydrate, a lipid, a protein, or a nucleic acid? Make sure to provide support for your answer.
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