Practice Quiz

MCAS Chemistry Exam Practice - Question List

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1. As heat is slowly added to a glass of ice water, the temperature remains at 0°C. Which of the following statements explains why the temperature of the mixture of ice and water remains constant as heat is added?
  1. Heat is stored in the solid ice.
  2. Heat is stored in the liquid water.
  3. Heat is used to turn the solid ice into liquid water.
  4. Heat is absorbed equally by the solid ice and the liquid water.
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2. Which of the following statements explains why elements of the alkali metal family are highly reactive?
  1. Alkali metals are easily ionized.
  2. Alkali metals are negatively charged.
  3. Alkali metals have an odd number of protons.
  4. Alkali metals have an odd number of electrons.
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3. Which of the following statements describes the role of a buffer?
  1. It increases the rate of a reaction.
  2. It keeps the pH of a solution within a small range.
  3. It changes the oxidation states of elements in a compound.
  4. It shifts the reaction equilibrium to favor more product formation.
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4. 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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5. 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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