Whats a property that changes the appearance of a substance but is still the same substance

In 1901, thomas edison invented the nickel-iron battery. the following reaction takes place in the battery. fe(s) + 2 nio(oh)(s) + 2 h2o(l) fe(oh)2(s) + 2 ni(oh)2(aq) how many mole of fe(oh)2, is produced when 5.35 mol fe and 7.65 mol nio(oh) react?

At 450 mm hg a gas has a volume of 760 l, what is its volume at standard pressure

How do you convert 4 mmol of bromobenzene to ml?