HESI CHEMISTRY

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pearl.lagua
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208837
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HESI CHEMISTRY
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2013-03-21 23:33:43
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HESI CHEMISTRY
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HESI CHEMISTRY
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  1. What are all metric measurements composed of?
    Metric prefix and a basic unit of measure
  2. What is the most commonly used temperature scale in the scientific community?
    Celsius or Centigrade
  3. The nucleus of an atom contains or is made up of which of the following?
    Protons and neutrons
  4. What is an atom that has a positive charge called?
    A cation
  5. In the periodic table, what are the rows called?
    Periods
  6. What is the atomic number?
    Number of protons
  7. Which of the following describes the atomic mass?
    Average mass of that element's isotopes
  8. Chemical equations are written in which manner?
    Reactants -> Products
  9. What is the charge on potassium in the compound KCl?
    +1
  10. A catalyst is a substance that accelerates a reaction by which of the following?
    Finding an alternate pathway for a reaction that requires less energy.
  11. Percent concentration of a solution is expressed as which of the following?
    Parts per 100 parts
  12. What will one liter of a molar solution of any element contain?
    The atomic mass in grams of that element
  13. Chemical bonding is the bonding of which of the following?
    One atom to another atom
  14. Which of the following describes an ionic bond?
    It does not share electrons
  15. What is the concentration of 58.5 g of NaCl in 2 L of solution (atomic weights of each elements are as follows: Na=23g/mol, Cl=35.5g/mol)?
    0.5 mol NaCl
  16. In a redox reaction, which of the following describes reduction?
    It is the gain of electrons
  17. What are acids?
    Hydrogen donors
  18. What is a benefit of water's ability to make hydrogen bonds?
    High specific heat
  19. What are bases or alkaline solutions?
    Hydrogen acceptors
  20. Chemical reactions in living systems proceed along catabolic pathways, and there tends to be an increase in which of the following?
    Entropy
  21. What is a pH of 7?
    Neutral
  22. What is the weakest of all intermolecular forces?
    Dispersion
  23. Beta radiation is the emission of which of the following?
    An electron
  24. Which of the following describes carbohydrates?
    They serve as fuel for the body
  25. What are monosaccharides?
    The simplest form of carbohydrates
  26. Disaccharides are the joining together of which of the following?
    Two monosaccharides
  27. Glycolysis is one of the body's chemical pathways for which of the following?
    Metabolizing glucose
  28. Amino acids are the building blocks for which of the following?
    Proteins
  29. What is the union of two amino acids using a peptide bond called?
    A dipeptide
  30. Which of the following describes lipids?
    They are stored for a source of fuel after carbohydrate depletion
  31. Which of the following describes DNA?
    It consists of two strands of a deoxyribose sugar-phosphate chain
  32. Use of the periodic table allows prediction of which of the following?
    The properties of each of the elements
  33. How could water be boiled at room temperature?
    By lowering the pressure
  34. What is a combustion reaction?
    It is a reaction that involves oxygen
  35. Iodine and carbon dioxide undergo sublimation at room temperature and atmospheric pressure. What is this process?
    Changing from a solid to a gas
  36. An experiment is performed to measure the temperature of boiling water at sea level. The actual boiling point is 104.6 C, 104.5 C, and 104.4 C. What term best describes these data?
    Precise

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