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chemical equations, reactions, and bonding in relation to th

3. all the following are signs of a chemical reaction, except
a. a change in energy.
b. a release of gas.
c. a change in color or odor.
d. a change of state.

4. which of the following is true regarding the inner transition elements?
a. these include the lanthanides and actinides and do not have f sublevels.
b. their valence electrons can be located in both s and f sublevels.
c. they occupy the d block of the periodic table.
d. these include all elements in groups 3–12.