Question 1 (12 points) Saved
Use C R to solve the problem: C-Claim how to set up the problem, Solve, R-
Explain your answer
Oxygen gas, O2, reacts with hydrogen gas, H2, under pressure to yield water, H20,
according to the following equation:
_O2(g) +
H2(g)
H2O(g)
How many liters of hydrogen gas(at 0.97 atm and 24°C) will produce
180.0 grams of water?

when [oh-] is 10-5  m, and [h3o+] is 10-9  m, the poh is 5 and ph is 9. again in both cases the sum of ph and poh is 14. however, the hydrogen ion concentration is not always going to be equal to exactly 1 x 10 raised to a negative number. for example, we skipped over the value of 2.0 x 10-7.

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.