Jackie is the fastest student. (Option A)
Explanation:
- From the table it was understood that their speeds are given in meter per second, that is how many meters they run in one second. It was again shown that Jackie's race speed is 5.3 meter per second and all the other three namely Jeremy's speed is 3.9 meter per second, Mike's speed is 4.1 meter per second and finally Niki's speed is 3.8 meter per second.
- So, by comparing with others Jackie is the fastest runner in that race.
N(NaCl) = 3.8 mol
m(H2O) = 185 g = 0.185 kg
Kb=0.51 ⁰C*m⁻¹
T(water) = 100⁰C
M- molality of the solution = n ( mol of the solute)/m (solvent, kg) =
= 3.8 mol/0.185kg = 3.8/0.185 m
ΔT = Kb*M =0.51 ⁰C*m⁻¹ * 3.8/0.185 m = 10. ⁰C
T(boiling of the solution) = 100+10=110⁰C
Answer:
The answer to your question is:
Explanation:
Data
Ion charge of 2- and 18 electrons
Process
a) From which atom does this ion form?
If an Ion has a negative charge, it means that it has more electrons than the neutral atom. So, it the ion has 18 electrons, it means the neutral atom has 16 electrons.
In the periodic table we find that the atom with 16 electrons is Sulfur.
B) How do you know?
I have explained it.
An ion with a negative charge means that it gained the number of negative charges compare with the neutral atom.
Higher value- mass number
Lower value- atomic number/ number of proton