Which of the following may suggest a catalyst has been used in a reaction, given the energy diagram for the same reaction without a catalyst?

a. activation energy is 120 kj
b. activation energy is 40 kj
c. activation energy is 60 kj
d. enthalpy is 10 kj
e. enthalpy is 40 kj

Building glycogen from glucose molecules is an example of

100 grams of molten lead (600°c) is used to make musket balls. if the lead shot is allowed to cool to room temperature (21°c), what is the change in entropy (in j/k) of the lead? (for the specific heat of molten and solid lead use 1.29 j/g⋅°c; the latent heat of fusion and the melting point of lead are 2.45 × 104 j/kg and 327°c, respectively.)

Chlorophyll a had the molecular formula c55h72mgn4o5 how many atoms are in this molecule