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Reactions Questions - All Grades

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Grade 8 Reactions
The 3 types of radioactive decay are                         .
  1. Alpha, Beta, and Isotope
  2. Alpha, Beta, and Zenith
  3. Alpha, Beta, and Kappa
  4. Alpha, Beta, and Gamma
Grade 12 Reactions
Which among these catalyze reactions by lowering the activation energy?
  1. proteins
  2. enzymes
  3. carbohydrates
  4. steroids
Grade 10 Reactions
Which is the balance equation for the following reaction?

KCl+Al→AlCl3+K
  1. KCl+Al→AlCl3+3K
  2. 3KCl+Al→3AlCl3+K
  3. KCl+Al→3AlCl3+3K
  4. 3KCl+Al→AlCl3+3K
Grade 8 Reactions
Which of these reactions releases thermal energy?
  1. unbalanced
  2. balanced
  3. exothermic
  4. endothermic
Grade 10 Reactions
What happens to matter during a chemical reaction?
  1. some matter is destroyed
  2. matter is neither destroyed or created
  3. some matter is created
  4. some matter is destroyed and some is created
Grade 8 Reactions
Which of the following is a single replacement reaction?
  1. Al(NO3)3+MgSO4→Al2(SO4)3
  2. 2Na+CaCl2→2NaCl+Ca
  3. O2+2H2→2H2O
  4. 2H2O→2H2+O2
Grade 10 Reactions
An exothermic reaction
  1. absorbs heat from the environment.
  2. releases heat to the environment.
  3. refers to a process where two substances interact to create bubbles.
  4. none of the above.
Grade 11 Reactions
What is the Greek prefix for the number 4?
  1. tetra-
  2. hepta-
  3. hexa-
  4. deca-
Grade 11 Reactions
Balancing a chemical equation requires manipulation of the
  1. coefficients.
  2. subscripts.
  3. formulas of the products.
  4. number of the product.
Grade 11 Reactions
Which statement correctly defines an exothermic reaction?
  1. A chemical reaction with evolution of heat
  2. A chemical reaction with absorption of heat
  3. A chemical reaction with no change in internal energy
  4. A chemical chemical with no change in temperature
Grade 10 Reactions
What particle is transferred from one atom to another in a redox reaction?
  1. electron
  2. proton
  3. neutron
  4. nucleus
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