That depends. Arizona does not observe Daylight Saving Time. Iowa is in Central Time, and Arizona is Mountain Time, so if Daylight Saving Time is not in effect (November through March, approximate - they keep changing it), then Arizona is 8am when Iowa is 9am (1 hour difference).
If Daylight Saving Time is in effect, then there is a 2 hour difference, so 9 am Iowa is 7 am Arizona.
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