In a nuclear chain reaction, are used to trigger fission reactions.
a. electrons
b. protons
c. alpha particles
d. neutrons

Option (D) is the correct answer.

Explanation:

Nuclear chain reactions occur in fission reactions only. Nuclear fission reactions are defined as the reactions in which larger nuclide splits into two or more smaller daughter nuclides.

For example,

These neutrons released will again bombard with the uranium atom leading to another fission reaction and this chain continues.

Thus, we can conclude that in a nuclear chain reaction, neutrons are used to trigger fission reactions.

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

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