How do i balance na + h2o = naoh + h2

You have to combine each element on each side together.

You would do

1-Na-1 because there is 1 Na on each side

2-H-3 because there is 2 H on one side and 3 H on the other side

1-O-1 because 1 O on one side and 1 O on the other

Your final answer would be 2Na+2H2O-->2NaOH+H2

Hope I could help! :)

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e