It should be D, cells are parts, tissue is part and organ is part of a system.
<h2>The grams of the excess reactant that are left at the end of reaction is</h2><h2>= 1.2014 grams</h2>
<h3>calculation</h3>
find the moles of each reactant
moles = mass/molar mass
molar mass of Ga= 69.7 g/mol
molar mass of As= 74.9 g/mol
mole of Ga = 4 g÷69.7 g/mol=0.05739 moles
moles of As=5.50 g÷74.9 g/mol =0.07343 moles
0.05739 moles of Ga reacted completely with 0.05739 moles of As therefore As was in excess
Therefore the moles of As that did not react = 0.07343 - 0.05739=0.01604 moles
mass that did not react = moles that was left x molar mass of As
that is; 0.01604 x 74.9=1.2014 grams
The line spectra of an atom offers conclusive evidence that electron energies are quantized.
Neils Bohr showed that electrons in an atom can absorb or emit energy when they move from one energy level to another. This principle is the basis upon which the spectra of atoms is built.
The true statements about the atomic spectra is;
- The line spectra of elements are evidence that electron energies are quantized
- Energy is emitted from atoms as they move from higher energy levels to lower energy levels
Learn more about atomic spectrum: brainly.com/question/2049494
A and C I hope I helped :))
