All of the planets in our solar system have the same what?

IM CONFUSED HELP

If i can still dissolve more sugar into the solution at a certain temperature what would i call that solution

What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?

At a certain temperature the rate of this reaction is first order in hi with a rate constant of : 0.0632s2hig=h2g+i2g suppose a vessel contains hi at a concentration of 1.28m . calculate how long it takes for the concentration of hi to decrease to 17.0% of its initial value. you may assume no other reaction is important. round your answer to 2 significant digits.