I NEED HELP AYEEYYEYWY how is the chemical reaction for iron (II) + carbonate

iron (III) + carbonate

and iron (III) and (II) + sulfate

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?

Draw a line graph showing the relationship between temperature in kelvin as a function of kinetic energy.

Polar bears give birth and hunt on sea ice. which of the following would polar bears survive during the melting of arctic ice? growing another layer of fur during summer migrate inland to search for different food sources staying put until the ice refreezes sticking to the usual diet of seals