Radical 亻
4 strokes
person 亻 (13a) + seven 七 (37) = change 化
This also means “to alter” and can sometimes be translated by using word endings such as “-ize” or “-ify”.
化学 (82) huàxué chemistry
文化 (25) wénhuà culture

Harry looks in his diary and sees that in seven days he has to change the clock on the church tower (to daylight saving time). / Last time he had forgotten and the ghostly dwarf who guards the tower had given him a hard time.