Identify which of the following statement is a theory. All matter is made of tin

Question

Identify which of the following statement is a theory. All matter is made of tiny, indestructible particles called atoms. When iron rusts in a closed container, the mass of the container and its contents does not change. In chemical reactions, matter is neither created nor destroyed. When a match bums, heat is given off. Determine the number of protons, neutrons and electrons in a iodine-123 isotope (^123_53I) used for evaluation of thyroid cancer. Determine the number of gas molecules that comprise one breath of air with a volume of 2.5 L at body temperature (310 K) and a pressure of 0.987 atm. 5.8 times 10^22 molecules 4.4 times 10^25 molecules 6.2 times 10^24 molecules 6.7 times 10^22 molecules 6.0 times 10^23 molecules Red lead, Pb_3O_4, decomposes into lead monoxide and oxygen gas: Identify the coefficient in front of PbO when this reaction is balanced. 1 3 4 6

Explanation / Answer

11)
I think A is correct definition and hence it is theory
Answer: A (not sure)

12)
atomic number of I = 53
mass number is given as 123

so,
number of proton = number of electron = 53
number of neutron = 123 - 53 =70

Answer: C

13)
1st find the number of moles of gas
P*V = n*R*T
0.987*2.5 = n*0.0821*310
n = 0.09695 mol

number of molecules = number of mol * Avogadro's number
= 0.09695 * 6.022*10^23
= 5.8*10^22 molecules
Answer: A

I am allowed to answer only 1 question at a time

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