Unsaturated hydrocarbons need a to react. high activation energy low activation energy high ionization energy high temperature

low activation energy

Explanation:

Activation energy is the extra energy required by the reactants to overcome the energy barrier to convert to products.

Unsaturated hydrocarbons are defined as the hydrocarbons which have double or triple covalent C-C bonds. They are known as alkenes and alkynes respectively. The general formula for these hydrocarbons is and .

Unsaturated hydrocarbons are more reactive than the saturated ones because of the presence of bonds. They are weaker than bonds and thus can be easily broken and thus require less energy for conversion into products.

in simple terms, the principle states that the buoyancy force on an object is equal to the weight of the fluid displaced by the object, or the density of the fluid multiplied by the submerged volume times the gravitational acceleration, g. this is also known as upthrust.

i am pretty sure it is c because when people are closer together, they cannot move as freely. picture being in a mostly full elevator, for instance. the people are right next to you, and you can barely move.