You can but it would be wise not to. Most 60hz appliances will not work at 50 Hz.
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Yes, no problem at all. The frequency does not enter into the equation because the hot plate is a strictly resistive load.
no way because frequency cannot change
As of 2000, Australian power points supply AC 230v at 50hz. Pre-2000, it was 240v at 50hz.
Maybe, maybe not, you have to make sure the oven is designed run with the right voltage. Apart from timers etc. the oven doesn't mind if it's 50 or 60 Hz.
Not really because motors are designed to run at either 50 or 60 Hz and the wrong frequency might cause them to malfunction or overheat.
As the waffle maker is a totally resistive load there will be no problem using the different supply.
no way because frequency cannot change
Assuming that this question is about adapters for traveling to another country (not USA) then 230V is the equivalent of 220V. Just purchase a suitable adapter.
No! Normally not, the recistance in the windings is to hig on 60Hz and the pump motor has not power enough to work propelly. This happened to myself when I connected my Whirpool AWE 7519 to 230V 60Hz. Europian model for 50Hz.
you can't
Yes, no problem.
230V/50Hz
Most likely, yes. Most devices has been manufactured with an idea that they will be used in areas where the supply power frequency is 50 or 60Hz.
220v 50Hz
nothing
There should be no problem at all.
220V , 50Hz
an adapter is needed because the 50 or 60 refers to cycles or how many times elec. changes direction a second . an adapter is needed to change from 50 to 60 or vice versa 60 cycle is used in usa and 50 cycle is used in Europe