Which describes how chemical changes are different from physical changes? (2 points) a Chemical changes can be measured, but physical changes cannot. b Chemical changes involve the formation of a new substance. c Chemical changes release energy, but physical changes absorb energy. d Chemical changes cannot be caused by oxygen.

gold is my favorite solid.

he uptake of drugs from the intestine is often strongly influenced by diffusion. for example, consider a water-insoluble steroid for treating inflammation that is solubilized in aggregates of detergent molecules, called micelles. these micelles, aggregates of 80 soap molecules, have a molecular weight of 24,000, a diameter of 2.6 nm, and a charge of -27. the positively charge ions (counterions) in this system are na".

nuclear fission produces elements that are heavier than helium.

the elements that are used in nuclear fission and their products are much heavier than helium.