use examples from the article to explain one
positive and one negative effect that chemistry has
had on society.

Chemistry is the natural science that focuses on the study of the composition and structure of substances, the chemical changes that take place under certain conditions, and the laws that can be distilled from them.

Some positive results of chemistry are, among others, the creation of new drugs that have been used for the cure or treatment of various diseases, such as the creation of penicillin, aspirin or retro-virals against AIDS.

In turn, the negative results of chemistry have been the development of nuclear weapons or weapons of mass destruction, which have caused too many victims throughout history.

Learn more in link

hi,

the capital city of australia is canberra.

given:

mass of na = 115 g

excess cl2

to determine:

mass of nacl produced

explanation:

given reaction is-

2na(s) + cl2(g) → 2nacl(s)

since cl2 is in excess, na will be the limiting reagent

as per the reaction stoichiometry na: nacl = 1: 1

i.e. moles of na reacted = moles of nacl formed

now, # moles of na = mass of na/atomic mass

                                  = 115 g/23 g.mol-1 = 5 moles

therefore, moles of nacl = 5

molar mass of nacl = 58 g/mol

mass of nacl = 5 moles * 58 g.mol-1 = 290 g

ans: amount of nacl produced = 290 g