Physical eruption im not sure ask your chemical teacvher
Statement #2 does not correctly compare boron to copper. B Boron is a semi metal so it can conduct electricity however metals (like Cu copper) are much better conductors of electricity.
You could use the less malleable mixture of minerals. Say you have a gold earring this is bad because overtime it goes through lots of wear and tear, the shape of the earring will change. If it was less malleable it will withstand more wear and tear.
Answer:
pH= 9.2
Explanation:
Henderson hasselbach equation
pKa= log Ka= log (4.9 x 10^-10)=9.3
pH= 9.2
Molarity=(initial molarityxinitial volume)/final volume
M=(3.5x25.4)/166.7=0.533 M