7. 2. Nêu hiện tượng, viết PT xảy ra khi: a. cho hh gồm 0,2 mol Fe2O3 và 0,2 mol Cu vào dd H2SO4 loãng dư
b. Cho bột Fe vào dd AgNO3 dư
c. cho hh gồm 0,2 mol K và 0,2 mol Al2O3 vào nước dư
d. cho bột Cu vào dd H2SO4 đặc, nóng dư
e. Cho ure vào dd nước vôi trong dư

Which of the following units is not an official si unit? mole liter kilogram ampere

What is the difference between covalent bonds and ionic bonds? covalent bonds involve the sharing of electrons between atoms; ionic bonds involve the electrical attraction between charged atoms. covalent bonds involve the transfer of electrons between charged atoms; ionic bonds involve the sharing of electrons between atoms. covalent bonds involve the sharing of pairs of electrons between atoms; ionic bonds involve the sharing of single electrons between atoms. covalent bonds involve the sharing of electrons between atoms; ionic bonds involve the sharing of protons between charged atoms.

The image compares the arrangement of electrons in two different neutral atoms. a figure labeled atom q has a shaded sphere at the center of three concentric circles. the innermost circle has two black spheres. the middle circle has six black spheres. to the left of this figure is another figure labeled atom p. atom p has a shaded sphere at the center of three concentric circles. the innermost circle has two black spheres. the middle circle has seven black spheres. which of the following best explains the position of the two atoms in the periodic table?