For which of the following processes would there be a decrease in entropy? a. melting ice b. separation of a compound c. boiling water d. freezing water

Abullet found at a crime scene may be used as evidence in a trial if the percentage of metals match to the composition of metals in a bullet from the suspect's ammunition. a forensic scientist's analysis of the bullet shows that it contains 11.9 g of lead, 0.5 g of tin, and 0.8 b of antimony. what is the percentage of lead metal in the bullet? express your answers to the one's place.

Asingle atom of an element has 21 neutrons, 20 electrons, and 20 protons. which element is it? ok o z

Iknow the answer to 13 is b and 14 is d. i just need to know why the correct answers are correct