化性 is read as かせい (kasei) and means voltinism.
かせい
kasei
ふきはつせいか
fixation
そしきぷらすみのーげんかっせいかいんし
tissue plasminogen activator
いせいか
isomerization
ぞくせいかりょういき
qualified area
かがく
chemistry
ばけもの
goblin
かせき
fossil
ばける
to disguise oneself as
かす
to influence
かごう
chemical combination
かごうぶつ
compound
change