Is it physical change or chemical change when you smooth a wood chair with sandpaper?

H2so4(aq) + mg(s)—> mgso4(aq) +h2(g) which substance is the acid in the reaction?

Select the correct answer. which phrase correctly describes temperature? o a. average rotational kinetic energy of the particles in an object o b. average energy of the particles in an object c. average translational kinetic energy of the particles in an object od. all energy possessed by the particles in an object

Reactions in cells take place at about a. 40°c b. 0° c. 100°c d. 60°c