PLS HELPP Nuclear reactions occur when the nuclei of two different atoms collide to produce products that are different from the starting substances. How is this similar to a chemical change?

a. a chemical change can easily be reversed.
b. in a chemical change, mass can be created
c. in a chemical change, energy can be created
d. in a chemical change, a new substance forms​

The membrane surrounding a living cell consists of an inner and an outer wall that are separated by a small space. assume that the membrane acts like a parallel plate capacitor in which the effective charge density on the inner and outer walls has a magnitude of 7.0 × 10-6 c/m2. (a) what is the magnitude of the electric field within the cell membrane? (b) find the magnitude of the electric force that would be exerted on a potassium ion (k+; charge = +e) placed inside the membrane.

A175 g lump of molten lead at its melting point (327 c) is placed into 55.0 g of water at 20.0 c. the specific heat of lead is 130.j/kg c and the hf of lead is 20,400 j/kg. when the lead and the water have reached equilibrium, what is the temperature of the mixture?

Which type of bond is found between the atoms of a molecule? a. metallic b. delocalized electron c. covalent d. ionic