What is altered by a catalyst? a) average kinetic energy of products

b) activation energy

c) difference between the energies of products and reactants

d) average kinetic energy of reactants

Which of these properties, used alone, would be least useful in identifying most minerals? a. color b. luster c. streak d. density

Ageologist determines that a sample of a mineral can't be scratched by a steel nail but can be scratched by a masonry drill bit. based on this information, the sample mineral has to be softer than a. orthoclase. b. fluorite. c. apatite. d. corundum.

An animal cell loses the ability to convert energy stored in food to energy that the cell can use. which of the cell's organelles has stopped working? a.the mitochondria b.the nucleus c.the vacuoles d.the endoplasmic reticulum