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Chemical Reactions
  • 1. A chemical change is different than a physical change because in a chemical change
A) Chemicals are used
B) The change can be seen but in a physical change it cannot
C) Molecules do not physically touch
D) A new substance is formed and in a physical change no new substance is formed
  • 2. In a chemical reaction
A) The atoms of the reactants always stay together to form the products
B) The atoms of the reactants unbond, rearrange, and then rebond to form the products
C) Some atoms disappear while others multiply to form the products
D) New atoms are formed which combine to make the products
  • 3. In the chemical reaction CH4 + 2O2 → CO2 + 2H2O, there are reactants on the left of the equation and products on the right. If you count the atoms in the reactants, there are
A) 4 carbon atoms, 4 hydrogen atoms, and 2 oxygen atoms
B) 1 carbon atom, 4 hydrogen atoms, and 2 oxygen atoms
C) 4 carbon atoms, 4 hydrogen atoms, and 4 oxygen atoms
D) 1 carbon atom, 4 hydrogen atoms, and 4 oxygen atoms
  • 4. In a chemical reaction, mass is conserved. This means that
A) The mass of the reactants stays the same during a chemical reaction
B) The mass of the products is always twice the mass of the reactants.
C) The mass of the products stays the same during a chemical reaction
D) The type and number of atoms in the reactants equals the type and number of atoms in the products
  • 5. If more reactants are used in a chemical reaction, then more products will be produced. This means
A) Too many products can slow down the reaction
B) More reactants cause the reaction to heat up
C) More reactants have more atoms to react to form more products
D) More reactants take up the same volume
  • 6. If two substances react and the temperature of the mixture increases, the reaction is
A) One that needs a catalyst
B) Not one that produces anything new
C) Exothermic
D) Endothermic
  • 7. If a reaction is exothermic,
A) The same amount of energy is used to break the bonds of the reactants as is released when the bonds in the products are formed
B) The temperature goes down
C) More energy is released when the bonds in the products are formed than is used to break the bonds in the reactants
D) It takes more energy to break the bonds of the reactants than is released when the bonds in the products are formed
  • 8. Redox reactions involves exchange of
A) Neutrons between atoms
B) Neutrons between atoms
C) Electrons between atoms
D) Neurons between molecules
  • 9. NADH is the ______ form of NAD+.
A) charged
B) oxidized
C) neutral
D) reduced
  • 10. Oxidation is the _____ of electrons while reduction is the _______ of electrons.
A) loss; gain
B) gain; loss
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