in the Raven - How does the poem's use of internal rhyme contribute to the tone of the piece? Cite at least one example in your answer

Internal rhymes are patterns of rhyming words inside the same line. This effect can increase the tension of the poem, as it can make the reader to accelerate the pace, or to slow it down by making more emphasis on the rhyming words.

Increasing tension is a very important part in The Raven's tone, as the speaker becomes more anxious as time passes by, because of the feathered animal's presence.

One example of this can be seen in the lines 57-58:

Nothing further then he uttered - not a feather then he fluttered -

Till I scarcely more than muttered "Other friends have flown before -

On this example, there are two rhymed words in line 57, and a third one on line 58. Even though the third word is on a different line, it's considered to be internal rhyme because it's not in the end of the line. The three words are not only connected by rhyme, but because they all have to do with sound (or lack of sound, in the case of fluttered).