Answer:
x = 86.908 amu
Explanation:
Average mass of isotope = 85.4678 amu
Rb-85 = 84.9117 amu, Percentage = 72.15% = 0.7215
Other isotope = x, Percentage = 100 - 72.15 = 27.85% = 0.2785
Average mass = (Percentage * Mass of Rb-85) + (Percentage * Mass of Rb-87)
85.4678 = (0.7215 * 84.9117) + (0.2785 * x)
85.4678 = 61.2638 + 0.2785x
0.2785x = 24.204
x = 24.204 / 0.2785
x = 86.908 amu
Answer:
Yes, electrons with energy of 1.3ev will be emitted from the metal surface
Explanation:
From Eisenstein's photoelectric equation;
KE= E - Wo
Where;
KE= kinetic energy of the emitted photoelectron = ??
E= Energy of the photon =4.5 ev
Wo= work function of the metal = 3.2ev
KE= 4.5 ev - 3.2 ev
KE= 1.3 ev
Answer:
C) hydrogen bonds
Explanation:
The abnormally high boiling point of HF compared to HCl is primarily due to the intermolecular forces called hydrogen bonds.
Hydrogen bonds are intermolecular forces of attraction between polar molecules in which a hydrogen atom is directly joined to a highly electronegative atom (oxygen, nitrogen or fluorine).
Hydrogen bonds are very strong force of attraction compared to dipole - dipole attraction that holds the HCl together.
Answer:
it was when she added the vinegar onto the baking soda paste. since bubbles formed it became a chemical reaction
