Which balanced equation represents a redox
reaction?
(1) cuco3(s) ==> cuo(s) + co2(g)
(2) 2kclo3(s)==> 2kcl(s) + 3o2(g)
(3) agno3(aq) + kcl(aq) ==> agcl(s) + kno3(aq)
(4) h2so4(aq) + 2koh(aq)==> k2so4(aq) + 2h2o(l)

Aspirin has a density of 1.40 g/cm3 what is the volume in cubic centimeters of a tablet weighing 320 mg ?

Which is a chemical property of iron? a. it forms iron oxide (rust) when exposed to moisture and air. b. it is a gray–black metal that is hard to the touch. c. it has a melting point of 2795°f (1536°c). d. it is a good conductor of heat

As air becomes more dense, (select all that apply) o. air weighs less o. gas molecules are closer together o. air is colder o. air weighs more o. gas molecules are further apart o. air is hotter