Areaction in a solution would proceed slowest when -

a. water is added and it is cooled.

b. water is added and it is warmed.

c. reactants are added and it is cooled.

d. reactants are added and it is warmed.'

a.metals can become magnetic if they have many spinning electrons that create magnetic fields.d.only some metals are attracted by magnets; these metals are called ferromagnetic.

d.wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current.

one "light year" is the distance that light travels, through vacuum, in one julian year.   that's 365.25 days, of 24 hours each.