Iodine would have chemical properties most like?

What is the name of this hydrocarbon?

Esign techniques and materials that reduce the negative environmental impact of a structure are referred to as

The twister and runaway train are two coasters at the same amusement park. both coasters start at the same height. the coaster for the twister is twice the mass of the coaster for the runaway train. which roller coaster has greater gravitational potential energy at the start of the ride?