Which of the following is not a step in balancing redox reactions in acidic solution, using the half-reaction method?

a) h2o and oh- are added as needed to the half-reaction equations to make the number of oxygen and hydrogen atoms balance.

b) divide the chemical equation into two half-reaction equations, identifying which half-reaction is oxidation and which is reduction.

c) h2o and h+ are added as needed to the half-reaction equations to make the number of oxygen and hydrogen atoms balance.

d) multiply each term in one of the half-reaction equations by a factor that will make the number of electrons lost (in the oxidation) equal to the number of electrons gained (in the reduction).

The answer would be A). H2O and OH- are added as needed to the half-reaction equations to make the number of oxygen and hydrogen atoms balance.

- "the choice that is not an indicator of a chemical change is "state of matter changes". more common than not, chemical reactions produce energy in the form of light or heat. along with energy, they also produce a new substance called the product that could be in any state of matter (solid, gas, or liquid)."

a: 45.9 meters

b: 4.29 seconds

step-by-step explanation:

a: h(t)=1/2(-9.8)(3)^2+0(3)+90

h(t)=-4.9(3)^2+90

h(t)=-44.1+90

h(t)=45.9 meters

b: 0=1/2(-9.8)(t^2)+0t+90

0=-4.9t^2+90

-90=-4.9t^2

18.37=t^2

t=4.29 seconds

in the second question, the numbers aren't exact, but they're a close approximation.