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LAW OF MASS ACTION MCQs

Total Questions : 32 | Page 3 of 4 pages
Question 21. For an object to remain at rest, which of the following must be true?
  1.    The forces on it are balanced
  2.    There is no friction
  3.    Gravity does not act on it
  4.    The object has no mass
 Discuss Question
Answer: Option B. -> There is no friction
Question 22. Which of these is a chemical reaction?
  1.    Boiling water
  2.    Melting aluminum
  3.    Crushing a piece of chalk
  4.    Cooking an egg
 Discuss Question
Answer: Option D. -> Cooking an egg
Question 23. If you increase the mass on an object, its acceleration
  1.    decreases
  2.    stays the same
  3.    also increases
  4.    stops
 Discuss Question
Answer: Option A. -> decreases
Question 24. The Law of Conservation of Mass States
  1.    Energy cannot be created nor destroyed, it can only change form.
  2.    Mass cannot be created nor destroyed, it can only change form.
  3.    Mass can be created or destroyed, it cannot change form.
  4.    All of above
 Discuss Question
Answer: Option B. -> Mass cannot be created nor destroyed, it can only change form.
Question 25. CO2 ---------> C + O2 is a
  1.    Synthesis reaction
  2.    Decomposicion reaction
  3.    Combustion
  4.    None of the above
 Discuss Question
Answer: Option B. -> Decomposicion reaction
Question 26. A decomposition reaction has
  1.    only one reactant
  2.    2 reactants
  3.    many reactants
  4.    none of the above
 Discuss Question
Answer: Option A. -> only one reactant
Question 27. C4H6 + 3O2 ---------> 4CO2 + 3H2O is a
  1.    Decomposicion reaction
  2.    Combustion reaction
  3.    Sintesis reaction
  4.    None of the above
 Discuss Question
Answer: Option B. -> Combustion reaction
Question 28. Na + Cl ------------> NaCl is a
  1.    Sintesis reaction
  2.    Decomposicion reaction
  3.    Combustion reaction
  4.    None of the above
 Discuss Question
Answer: Option A. -> Sintesis reaction
Question 29. Does the equation H2+O2 →H2O follow the Law of Conservation of Mass?
  1.    Yes, because the atoms are equal.
  2.    No, because more info is needed.
  3.    No, because there are more atoms in the product.
  4.    No, because there are more atoms in the reactant.
 Discuss Question
Answer: Option D. -> No, because there are more atoms in the reactant.
Question 30. The number of atoms of N (nitrogen) in 3N2O5 is
  1.    2
  2.    5
  3.    6
  4.    15
 Discuss Question
Answer: Option C. -> 6

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