How many atomsl# of particles of Hydrogen are
there in 2 moles of Hydrogen?
(hint this is not a small
number)

1.204×10^24 atoms

Explanation:

1 mole of element contains 6.02×10^23 atoms so 2 moles of hydrogen contains 2×6.02×10^23 = 1.204×10^24 atoms

for step 7 table c on the lab "newtons law of action"   the average time it took the car to travel .25 meters   was 1.92 seconds.

the average time it took the car to travel 0.50 meters was 2.61 seconds

hope this : )

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.