How does the poem's use of internal rhyme contribute to
the tone of the piece? cite atldast one example in your
answer.

Internal rhymes, are words found in the same line of a poem with a common pattern, they ca be determined as metrical lines

Explanation:

Internal rhymes, are words found in the same line of a poem with a common pattern, they ca be determined as metrical lines, in this way the idea is that middle and final word rhyme one with another. Depending on the rhyme it is possible to increase the pace or slow it down to according to the emphasis on the rhyme, creating in this way tension, mystery, a sense of anticipation, anxiety among some other sensations while reading the poem.  

Example:

Macbeth (By William Shakespeare)

“Double, double toil and trouble,

Fire burn and cauldron bubble…”