For the decomposition of urea in the reaction: CO(NH2)2(aq) + 2 H2O(l) → 2NH4 + (aq) + CO3 2− (aq) the pseudo first-order rate constant is 1.2 × 10−7 s −1 at 60°C and 4.6 × 10 −7 s −1 at 70°C. A) Estimate the activation energy b) Calculate the entropy of activation of the reaction and comment on the value.

Jason is a body builder. despite being more fit, he weighs more than his brother ryan, who is the same height. which is a possible reason? a. jason has more muscle mass than ryan does. b. jason has more body fat than ryan does. c. jason has more muscle mass and body fat than ryan does d. jason has less body fat than ryan does.

Abearing is designed to a reduce friction b. support a load c.guide moving parts such as wheels, shafts and pivots d. all of the above

Critical mass is the of material required to produce a chain reaction. a.) minimum amount b.) atomic mass c.) precise amount d.) maximum amount