Explanation:
what are the unit given for the questions
Answer:
Mass = 3. 6 ( 2 significant digits)
Explanation:
Number of moles = 0.045
Mass = ?
Relationship between number of moles and mass is given as;
Number of moles = Mass / molar mass
Mass = Number of moles * Molar mass
Mass = 0.045 * 80.91g/mol
Mass = 3.641
Mass = 3. 6 ( 2 significant digits)
Answer:
C. It does not participate in a decay series.
Explanation:
From this statement, we can deduce that a radioisotope that forms a stable isotope after it undergoes radioactive decay suggests that it does not participate in a decay series.
- It could have emitted any form of radioactive particles which can be alpha or beta.
- We do not know if it has a long or short half life because the value is not given.
- But since the radioactive decay in one step produces a stable isotope, we can conclude that it did not participate in a decay series.
- A decay series involves a radioactive decay in multiple steps.
Answer:
Vsln=13.2mL
Explanation:
MwPb(NO3)2=331.2g/mol
⇒ Vsln = (1L Pb(NO3)2/0.200molPb(NO3)2) * (molPb(NO3)2/331.2gPb(NO3)2) * 0.875gPb(NO3)2
⇒ Vsln = 0.0132L (13.2mL)
Answer 1: Atoms gain valence electrons to form anions.
Explanation:
Anions are negatively charged species of an ions. Anions are formed when atoms with nearly complete octet gains electrons.
Answer 2: Emission spectrum
Explanation:
When ever electron jumps from higher energy to lower energy level energy is emitted out in the form of light.The wavelength of the light is given as :
, E = energy, c= speed the light, h= planck constant
Answer 3: Two atoms of silicons could combine by fusion in order to create nickel.
Explanation:
Silicon has atomic number of 14 with atomic mass of 28 u.
nickel has atomic number of 28 with atomic mass of 59 u.
Two different isotopes of silicon atom will fuse together to give nickel.