Which chemical equation is balanced?
a. k2o + h2o -> koh
b. k2o + h2o -> 2koh
c. k2o + 2h2o -> 2koh
d. 2k2o + 2h2o -> 2koh

B. K2O + H2O -> 2KOH

Explanation

for the first one:

left side                             right side

kk                                       k

oo                                       o

hh                                       h

for the second one:

left side                             right side

kk                                       kk

oo                                       oo

hh                                       hh

for the third one:

left side                             right side

kk                                       kk

ooo                                    oo

                                 hh

for the fourth one:

left side                             right side

                                 kk

                                oo

                                 hh

c. live where it’s cold and icy

the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.