Idk if it is multiple choice but if it is it is the first two, if it is a single answer then it is the first one
Answer:
accretion at convergent boundaries
Explanation:
First, we must calculate the moles of lithium ions required using:
Concentration = moles / liter
500 ml = 0.5 L
0.125 = moles / 0.5
moles = 0.0625
Lithium phosphate has the formula Li₃PO₄, meaning each mole of lithium phosphate releases three moles of lithium ions. The moles of lithium phosphate required will be:
0.0625 / 3 = 0.021 mol
The mass of one mole of lithium phosphate is 116 g/mol
Mass of lithium phosphate required = 0.021 x 116
Mass of lithium phosphate required = 2.42 grams
Answer: 1.5
Explanation:
Just took the test on E2020!
Answer:
The metal surface becomes more positive as electrons are lost from it.
Explanation:
Let us note that photoelectric effect refers to a phenomenon in which electrons are ejected from a clean metal surface irradiated with light of appropriate frequency. This photon must possess a frequency above the threshold frequency of the metal and its energy must exceed the work function of the metal. When these conditions are met, electrons are emitted from a clean metal surface, having a constant kinetic energy as long as the frequency of the incident photon remains constant.
However, as photoelectric effect progresses and electrons are lost from the metal surface, the metal surface becomes more positive. The more positive the surface, the greater the attraction of the positive surface for the emitted electrons. This reduces the kinetic energy of the emitted photons even though the frequency of incident photons is held constant.