Answer:
The three main atomic particles are protons, neutrons and electrons. The atomic number of an atom identifies the number of protons in the atom. This is the defining characteristic of an element. An atom can gain or lose neutrons or electrons while retaining its elemental identity.
Explanation:
Answer:
B: Kilograms
Explanation:
Centimeters are used to measure length
Newtons are used to measure force
Kilograms measure weight or mass.
the force between the electron and the proton.
a) Use F = k * q1 * q2 / d²
where k = 8.99e9 N·m²/C²
and q1 = -1.602e-19 C (electron)
and q2 = 1.602e-19 C (proton)
and d = distance between point charges = 0.53e-10 m
The negative result indicates "attraction".
the radial acceleration of the electron.
b) Here, just use F = ma
where F was found above, and
m = mass of electron = 9.11e-31kg, if memory serves
a = radial acceleration
the speed of the electron.
c) Now use a = v² / r
where a was found above
and r was given
<span> the period of the circular motion.</span>
d) period T = 2π / ω = 2πr / v
where v was found above
and r was given
Depth where light intensity falls to one percent<span> of that at the surface, called the euphotic depth</span>
Answer:
The correct answer is because distilled water has a neutral pH=7.
Explanation:
Distilled water has a neutral pH of 7, which means that water is neither an acid nor a base. Vinegar is a dilute acid that can be further diluted with water, or it can be neutralized using a base. The term "pH" means "hydrogen potential", the more hydrogen-free ions in flotation in a solution, the more acidic it will be.
The pH of vinegar will always be kept at a lower than neutral number, no matter how diluted, because vinegar is an acid.
By adding distilled water (pH = 7) to the vinegar, it does not increase the amount of H+ in the solution, so it does not affect the pH of the vinegar.
Have a nice day!