Phy Sci 11 (2)

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Chemistry and Biology Reviewer

Chemistry Review

  1. When NaCl dissolves in water, aqueous Na+ and Cl – ions result. The force of attraction that exists between Na + and H2O is called a(n) _____ interaction.
    ion-dipole
  2. What is the intermolecular force present in LiF?
    None of the above
  3. The hydrogen bond plays a vital role in determining substance properties and structure. Which of the following may not be an example?
    Methane molecule
  4. Which of the following is most likely solid at room temperature?
    Na2S
  5. Which of the following should have the lowest boiling point?
    N2
  6. Considering that carbohydrates are a primary energy source for organisms, how would you describe the significance of understanding the simplest form of carbohydrates in sustaining life, and how might this knowledge be applied in a real-world context?
    Understanding the simplest form of carbohydrates allows for efficient energy utilization in organisms.
  7. Why are the four biological macromolecules essential for life?
    They do many important jobs to keep an organism functioning.
  8. What is the job proteins do not have in the body?
    Providing energy
  9. You are studying a newly discovered species and want to analyze its genetic information. What type of molecule would you analyze?
    Proteins
  10. There is a coating of the feathers of waterfowl such as ducks that keeps them from getting wet. Which molecule would this water-repelling coating be made of?
    Lipid
  11. If you have consistent issues with bowel constipation, which of the following should you increase in your diet?
    Cellulose
  12. Nucleotides are building blocks of nucleic acids, each is a composite molecule formed by
    Base-sugar-phosphate
  13. Enzymes, vitamins and hormones can be classified into a single category of biological chemicals because all of these:
    Help in regulating metabolism
  14. Fill in the blanks: The __________the surface area exposed to a chemical reaction, the __________the rate of the reaction.
    Smaller, faster.
  15. Why does a candle burn more rapidly when placed in an open jar than in air? What accounts for this reaction?
    Higher oxygen concentration
  16. Which of the following statements best defines the rate of a chemical reaction?
    The measure of change in the concentration of reactants or products per unit of time.
  17. Which statement best describes how a catalyst can speed up a chemical reaction?
    The catalyst makes lower energy pathways available.
  18. Which of the following statements is correct regarding sodium atoms? (Z=11, A=23)
    It has 11 protons, 11 electrons and 12 neutrons.
  19. Which of the following shows the neutral atoms of all of the isotopes of the same element?
    They have the same number of electrons.
  20. Why do covalent compounds tend to be liquid and gases at room temperature?
    It is due to the weak forces of attraction between molecules.
  21. Which of the following atoms when bonded with Fluorine atom, produces the highest degree of polarity?
    Oxygen
  22. The following molecules have polar covalent bonds EXCEPT.
    CS2
  23. Enzymes, which are biological catalysts, are primarily composed of:
    Proteins
  24. Which of the following factors can influence the activity of a catalyst?
    All of the above
  25. Which of the following statements about catalysts is incorrect?
    They are consumed during the reaction.
  26. When 10.00g H2 and 25.0g O2 react, they produce 10.00g water. Which is the excess reactant?
    10.00g H2
  27. How many moles of H2O can be produced by 6 moles of O2?
    6 moles of H2O
  28. Suppose your classmates will be visiting you. You decided to make burger for their snack. You have 20 burger patties and 17 burger buns, how many burgers you can make?
    17 burgers
  29. When the formula equation Fe3O4 + Al → Al2O3 + Fe is correctly balanced, the coefficient of Fe is number_.
    7
  30. Which source of energy is obtained from animal manure that produces methane needed to generate heat and electricity?
    Biogas
  31. The main reason for the worldwide slowdown in the construction of nuclear power plants is that:
    The electricity from nuclear power is generally more expensive to produce than electricity from other sources.

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