Mechanical waves don't require a medium. True. Mechanical waves are able to travel through air, water and solids.
It depends on the type of mechanical wave.
False. Mechanical waves cannot travel through a vacuum.
True, but only medium mechanical waves need a medium.

What type of reaction is shown below? check all that apply. 2h2o2 → 2h2o + o2 synthesis decomposition combustion

The identities of substances are the same before and after which type of change

Consider the following reaction at equilibrium: c(s)+h2o(g)⇌co(g)+h2(g) predict whether the reaction will shift left, shift right, or remain unchanged upon each of the following disturbances. a) c is added to the reaction mixture. b) h2ois condensed and removed from the reaction mixture c) co is added to the reaction mixture d) h2 is removed from the reaction mixture.