Epigenetics usually refers to heritable changes in the expression patterns of chromatin. Is it appropriate to refer to this term to describe changes that occur during memory formation?

Answer:YES.

Basically one characteristic feature of Epigenetic is the ability to provide a chromatin frameworks which can produce a set of gene expression that can be passed to subsequent generation by mitotic cell division, and which is unique to a class of cell.

Basically long term memory formation has been linked to a well organized pattern of gene expression. Therefore if Epigenetics could provide a particular chromatin framework for a specific set of gene expression; then it can be used to describe set of changes that occurred during memory formation since the gene expression for memory formation will be mediated by the particular chromatin framework unique to the group or family memory formation cells only. Therefore the gene expression will be well coordinated for memory expression.

Yes.

Explanation: Yes because epigenetics which simply the talks about the modification of genes is a major component in the changes that occur during memory formation. One cannot talk about Memory Formation without Gene expression which has been shown to be needed for long-term memory to form.