Answer:
B. six protons, six neutrons, and six electrons
Explanation:
Carbon-14 and Carbon-12 are the isotopes of carbon.
Isotope:
An atom of an element that contain same atomic number but different atomic mass.
The difference in atomic mass is due to the different number of neutrons present, but the number protons and electrons are remain same.
In C-14 there are six protons and six electrons while number of neutrons are,
Mass number - number of protons = number of neutrons
14- 6 = 8
In C-12 there are six protons and six electrons while number of neutrons are,
Mass number - number of protons = number of neutrons
12- 6 = 6
Thus in C-12, there are six protons, six neutrons and six electrons present.
Answer:
C. Degree of ionization
Explanation:
The strength of an acid or a base is determined by how many H+/H3O+ or OH- ions are dissociated in solution. Therefore, it's describing the degree of ionization.
Example: HCl is a strong acid because in water it will pretty much 100% dissociate into H+ and Cl- ions.
The third compound will have a suffix of -yne. Alkynes are molecules that contain triple bonds.
Answer:
2.01
Explanation:
The effusion is the passage of the molecules by a small hole by a difference of pressure. By Graham's Law, the rate of the effusion is inversely proportional to the square of the molar mass of the compound. Thus,
rateHF/rateHBr = √MHBr /√MHF
MHBr = 81 g/mol
MHF = 20 g/mol
rateHF/rateHBr = √81/√20
rateHF/rateHBr = 2.01
Answer:
D. If the pH of NaOH is 12, then that of Na₃PO₄ solution has to be lesser than 12.
Explanation:
In this problem, we are comparing the pH of a strong base to a weak base. A strong base is one that ionizes completely in aqueous solutions where as a weak base ionizes slightly.
The pH scale is good tool for measuring the acidity and alkalinity of various substances. It ranges from 1 - 14;
1 7 14
← →
increasing acidity increasing alkalinity
neutrality
Strong bases have their pH value close to 14 and weak bases are close to 7.
Since Na₃PO₄ is a weak base, it will have lesser pH value compared to a strong base such as NaOH
