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CHEMISTRY MCQs

Total Questions : 2589 | Page 256 of 259 pages
Question 2551. How many valence electrons does Sulfur
  1.    16
  2.    32
  3.    6
  4.    3
 Discuss Question
Answer: Option C. -> 6
Question 2552. Which particle does not contribute mass to the atom?
  1.    Proton
  2.    Neutron
  3.    Electron
  4.    Nucleus
 Discuss Question
Answer: Option C. -> Electron
Question 2553. How many valence electrons does Lithium have?
  1.    1
  2.    2
  3.    3
  4.    4
 Discuss Question
Answer: Option A. -> 1
Question 2554. A sample of bismuth has a mass of 343 g and a volume of 35
  1.    0.102 g/cm3
  2.    9.80 g/cm3
  3.    378 g/cm3
  4.    1.20 104 g/cm3
 Discuss Question
Answer: Option B. -> 9.80 g/cm3
Question 2555. Smoke is an example of a _____ because its suspended particles are just small enough not to layer out
  1.    Colloid
  2.    Positive
  3.    Suspension
  4.    Negative
 Discuss Question
Answer: Option A. -> Colloid
Question 2556. The number of significant figures in the measurement 170
  1.    Three
  2.    Four
  3.    Five
  4.    Six
 Discuss Question
Answer: Option D. -> Six
Question 2557. Which of the following changes is a chemical change of matter?
  1.    ice melting to produce water
  2.    vinegar combining with baking soda to produce carbon dioxide
  3.    water boiling to produce water vapor
  4.    liquid silica solidifying to form glass
 Discuss Question
Answer: Option B. -> vinegar combining with baking soda to produce carbon dioxide
Question 2558. When 2
  1.    6.3 X 10-8
  2.    6.3 X 108
  3.    6.3 X 1054
  4.    6.3 X 10-54
 Discuss Question
Answer: Option A. -> 6.3 X 10-8
Question 2559. Which of these statements is true of the scientific method?
  1.    The steps may vary somewhat to suit the experiment.
  2.    Working scientists rarely use it.
  3.    Scientists must follow its steps exactly.
  4.    Scientists rarely publish results of experiments.
 Discuss Question
Answer: Option A. -> The steps may vary somewhat to suit the experiment.
Question 2560. How do the following two elements bond together?Al3+ O2-
  1.    AlO
  2.    Al2O3
  3.    Al3O6
  4.    Al3O2
 Discuss Question
Answer: Option B. -> Al2O3

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