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CHEMISTRY MCQs

Total Questions : 2589 | Page 258 of 259 pages
Question 2571. Which is an example of a chemical reaction?
  1.    Ice melting
  2.    wood burning
  3.    salt stirred into water
  4.    rain falling
 Discuss Question
Answer: Option B. -> wood burning
Question 2572. What is one problem with using nuclear fission as an energy source?
  1.    finding radioactive elements that have longer half-lives
  2.    finding ways of storing radioactive wastes
  3.    finding compounds to cool heated water
  4.    finding non-radioactive elements for reactors
 Discuss Question
Answer: Option B. -> finding ways of storing radioactive wastes
Question 2573. Which compound is inorganic?
  1.    Glucose (C₆H₁₂O₆)
  2.    Ethane (C₂H₆)
  3.    Carbon Dioxide (CO₂)
  4.    Stearic Acid (C₁₈H₃₆O₂)
 Discuss Question
Answer: Option C. -> Carbon Dioxide (CO₂)
Question 2574. Which biomolecule is also known as enzymes?
  1.    Carbohydrate
  2.    Lipid
  3.    Nucleic Acid
  4.    Protein
 Discuss Question
Answer: Option D. -> Protein
Question 2575. What captures the sun's energy?
  1.    mitochondria
  2.    chlorophyll
  3.    stomata
  4.    cytoplasm
 Discuss Question
Answer: Option B. -> chlorophyll
Question 2576. Which of the following is the correct equation for PHOTOSYNTHESIS?
  1.    6CO2 + 6H2O --> 6O2 + C6H12O6
  2.    6CO2 + C6H12O6 + 6H2O --> O2 
  3.    6O2 + 6H2O --> 6CO2 + C6H12O6
  4.    C6H12O6 + 6O2 ---> 6H2O + 6CO2 
 Discuss Question
Answer: Option A. -> 6CO2 + 6H2O --> 6O2 + C6H12O6
Question 2577. Activation energy is
  1.    The energy to start a car
  2.    The energy needed to break down CO2
  3.    The energy needed to start a reaction
  4.    The energy used to digest food
 Discuss Question
Answer: Option C. -> The energy needed to start a reaction
Question 2578. The atomic number of an element is equal to the number of
  1.    protons and electrons
  2.    protons
  3.    electrons
  4.    electrons and neutrons
 Discuss Question
Answer: Option A. -> protons and electrons
Question 2579. Which of the following is an example of a heterogeneous mixture?
  1.    tap water
  2.    chunky peanut butter
  3.    orange-colored sugar water
  4.    gold ring
 Discuss Question
Answer: Option B. -> chunky peanut butter
Question 2580. The smallest unit of matter that retains the properties of that matter is
  1.    a molecule
  2.    a compound
  3.    a mixture
  4.    an atom
 Discuss Question
Answer: Option D. -> an atom

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