An iron nail that has rusted is an example of a chemical reaction?

i believe it is-

d.) gravity pulled particles of dust and gas together to form planets.

weight of any object is given by

w = m*g

where m is mass of the object and g is the acceleration due to gravity.

for earth the value of g is 9.8 m/s^2 so

w=117.6 n m=12 g=?

117.6=12g => g=9.8 m/s^2

which is the force of gravity on earth.

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gasoline is a mixture. it contains several different kinds of compounds that can be present in a variety of ratios.