Answer:
B. the products have more energy than the reactants.
1) Number of neutrons of Fluorine -19
The number 19 is the mass number of the atom.
The atomic number of fluorine is 9, which means it has 9 protons (which is constant for any atom of fluor
The number of protons is calculated as the mass number - atomic number = 19 - 9 = 10.
So, look for which of the other atoms have 10 neutrons
2)
element mass number atomic number number of neutrons
Neon-20 20 10 20 - 10 = 10
Oxygen-19 19 8 19 - 8 = 11
Sodium-22 22 11 22 - 11 = 11
Nitrogen-16 16 7 16 - 7 = 9
So, the atom that has the same number of nuetrons as Fluorine-19 is Neon-20
Answer: With power and energy, power is units of energy divided by time. The same difference as distance and velocity. The units of power are watts, the units of energy are joules.
Explanation:
All questions can be solved by C1V1=C2V2
1) 5.00M x V1 = 0.900M x 500.0 mL
V1= 90 ml
therefor you need to add 500 - 90 = 410.0 ml
2) 20.0 mL x C1 = 150.0mL x 1.50 M
C1= 11.25 M
3) 12.00 mL x 3.50 M = 100.0 mL x C2
C2= 0.42 M
4) 9.0 mL x 8.0 M = 0.50 M x V2
V2 = 144 ml