Practice Quiz

MCAS Biology Practice - Question List

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181. How many grams of KCl are dissolved in 2.00 L of a 0.200 M solution of KCl?
  1. 0.400 g
  2. 14.9 g
  3. 29.8 g
  4. 400 g
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182. A leaf gently floats on a pond. Which of the following statements best explains why the leaf stays on top of the water?
  1. The leaf has nonpolar covalent bonds between its atoms.
  2. The density of the leaf is greater than the density of the water.
  3. The water molecules are held tightly together by hydrogen bonding.
  4. The hydrogen and oxygen atoms in the water are chemically bonded.
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183. Silver (Ag) has 47 protons in each atom. Based on this information, which of the following also describes an atom of silver
  1. It has no neutrons.
  2. It has 47 electrons.
  3. It has 23 neutrons and 24 electrons.
  4. It has a total of 94 neutrons and electrons.
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184. In a hydrogen fluoride (HF) molecule, a hydrogen atom and a fluorine atom are held together by a polar covalent bond. Which of the following best explains why this bond is polar?
  1. the large difference in the atomic radii of hydrogen and fluorine atoms
  2. the large difference in the atomic masses of hydrogen and fluorine atoms
  3. the large difference in theelectronegativities of hydrogen and fluorine atoms
  4. the large difference in the number of electrons of hydrogen andfluorine atoms
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185. Which of the following occurs in an ionic bond?
  1. Two ions share protons.
  2. Two ions share electrons.
  3. Similarly charged ions attract.
  4. Oppositely charged ions attract.
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