Plz need fast
what is true about the size of terrestrial planets

a. venus and mars are about same size
b. earth and mars are about the same size
c. earth and jupiter are about the same size
d. earth and venus are about the same size

For the reaction c6h14(g) & longrightarrow; c6h6(g) + 4h2(g), δp(h2)/δt was found to be 2.5 x 10-2 atm/s, where δp(h2) is the change in pressure of hydrogen. determine δp(c6h14)/δt for this reaction at the same time.

Which change will decrease the number of effective collisions during a chemical reaction? a. adding a catalyst b. increasing the surface area c. decreasing the temperature d. increasing the reactant concentrations e. increasing the volume of the reactants

At what temperature will a solid melt ?