Practice Quiz

CLEP Chemistry Practice Test - Question List

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46. Which of the following elements has characteristics of some metals and also of some nonmetals?
  1. antimony ( 51Sb)
  2. calcium ( 20Ca)
  3. sulfur ( 16 S)
  4. zinc ( 30 Zn)
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47. Which of the following explains why saltwater is considered a mixture?
  1. It is composed of one element.
  2. It is composed of one compound.
  3. It is composed of two or more substances and has new chemical properties.
  4. It is composed of two or more substances that retain their own chemical properties.
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48. Which of the following chemical equations is balanced correctly?
  1. C6H6 + O2 → 2CO2 + 3H2O
  2. CS2 + 3Cl2 → CCl4 + S2Cl2
  3. B2O3 + 2C → B4C + CO
  4. Cl2 + NaI → 2NaCl + I2
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49. Under certain conditions, solid magnesium (Mg) and solid sulfur (S) can combine and form magnesium sulfide (MgS). The oxidation-reduction reaction is shown below.Mg(s) + S(s) → MgS(s) Which of the following is the oxidation number for Mg in MgS in this reaction?
  1. +1
  2. -1
  3. +2
  4. -2
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50. Which of the following is the formula for ammonium hydroxide?
  1. Al2O3
  2. AmO2
  3. NH3OH
  4. NH4OH
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