10 m/s to 80 m/s in 5 seconds

If you burn 10 kilograms of wood in a fire (combustion) what is the weight of the products after the fire has finished burning the wood?

Which of the following is described by the equation h2o(s)+ heat=h2o(i) a freezing melting condensing evaporating

Pl what kind of reaction is this? nahco3 + h2o → co2 + naoh + h2o -composition -decomposition -single replacement -double replacement im leaning more toward single replacement. if im wrong can you explain whyy?