Halloween makes a perfect concoction when you mix together a decked-out house and chemistry.

The University of Northern Iowa Student Chapter of the American Chemical Society and students from the biology, physics and earth science departments hosted the annual “Halloween House.”

Halloween House has been at UNI for five years, and offers free admission for children of all ages 

The event was intended to teach participants the fun of three sciences: chemistry, biology and physics, along with the scheduled Halloween-themed demonstrations, such as “Devil’s den,” “Witches’ lair” and “Pirate’s cove.”

Felicia Thadison, chemistry instructor, said last year’s family favorite station was the “Devil’s den.” 

The “Devil’s den” focused on flames and how chemistry students could make them into different colors and shapes.

Angela Wrage, senior chemistry and biology double major, said the exhibits are completely safe, with the flames kept away from the families. Protective gear was also provided. 

A new station this year was “Frankenstein’s lab” which showed visitors different physics and chemistry concepts. 

Biology students showed children the difference between fruits and vegetables and the difference between insects and spiders. 

Jade Simpson, junior biology major, has helped with the Halloween House for three years. She preferred to stay at the creepy crawlies station to show pictures of arachnids and insects, letting children figure out the differences between them. 

“Witches’ lair,” or the witchery recruitment, focused on interactions between the elements of chemistry. Demonstrators offered families the chance to break flowers that had been dipped in nitrogen.