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General Knowledge > General Science

LAW OF MASS ACTION MCQs

Total Questions : 32 | Page 1 of 4 pages
Question 1. Since gasses weigh nothing, when they are produced in a reaction they do not have to be accounted for
  1.    True
  2.    False
 Discuss Question
Answer: Option B. -> False
Question 2. P4 + 3 O2 ---> 2 P2O3
  1.    Single Replacement
  2.    Combustion
  3.    Synthesis
  4.    Decomposition
 Discuss Question
Answer: Option C. -> Synthesis
Question 3. Which are the reactants in the following reaction?2Mg + O2 ---> 2MgO
  1.    Mg and O
  2.    MgO
  3.    Mg and MgO
  4.    O and MgO
 Discuss Question
Answer: Option A. -> Mg and O
Question 4. A student mixes 125 grams of sugar, 250 grams of water and 5 grams of flavoring
  1.    250 grams
  2.    380 grams
  3.    375 grams
  4.    400 grams
 Discuss Question
Answer: Option B. -> 380 grams
Question 5. What do we call the chemicals that result from a chemical reaction?
  1.    reactants
  2.    products
  3.    subscripts
  4.    coefficients
 Discuss Question
Answer: Option B. -> products
Question 6. According to the Law of Conservation of Mass, what happens to the wood and oxygen when it is burned?
  1.    The wood disappears.
  2.    It stays the same chemically.
  3.    The atoms in the wood and oxygen rearrange and form smoke and ash.
  4.    Nothing.
 Discuss Question
Answer: Option C. -> The atoms in the wood and oxygen rearrange and form smoke and ash.
Question 7. ________ are the starting substances in a chemical equation
  1.    Reactants
  2.    Producer
  3.    Reaction
  4.    Products
 Discuss Question
Answer: Option A. -> Reactants
Question 8. Oxygen must be present for what kind of reaction to occur?
  1.    Synthesis
  2.    Decomposition
  3.    Combustion
  4.    None of the above
 Discuss Question
Answer: Option C. -> Combustion
Question 9. The law of conservation of mass states that ________
  1.    the total mass of reactants is more than the total mass of products
  2.    the mass of a chemical reaction is not constant
  3.    the mass of a chemical reaction remains constant
  4.    the total mass of reactants is less than the total mass of products
 Discuss Question
Answer: Option C. -> the mass of a chemical reaction remains constant
Question 10. How many atoms do you have in the compound 2MgCl2?
  1.    2 atoms
  2.    4 atoms
  3.    6 atoms
  4.    8 atoms
 Discuss Question
Answer: Option C. -> 6 atoms

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