Is heat required for these processes to occur?

[n108]

Indicate if the following processes requires heat for the process to
occur.

a. C6H12O6 + O2---> CO2 + H2O + Heat
b. Making ice cubes
c. Formation of snow in clouds
d. Evaporation of water
e. A candle flame

i think they all require heat, but I am not sure
someone please help!

 

[interested_learner]

Think! Some require heat and some don't. For example, to make ice do you put the cubes in the freezer or in the oven?

 

[n108]

im pretty sure about most of them,
but for formation of snow in clouds, i don't know.