^
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Square root of (4^2 + 4^2) = 4*squareRoot(2)
350km/5.15 hours~68km per hour
The formula is CaCl2 as you need two Cl ions in order to combine with one Ca ion in order to form a neutral compound i.e. You need to have the same amount of charges therefore you have two Cl ions which have -1 charges for one +2 Ca ion.
Hope this helps :).
The average human generates around 100 watts in an average day
the answer is J. 3,900,000 got it right on the test
