The Erlenmeyer flask that was used in the titration below contained 25.0 mL of 0.1 M HCl. If 0.1 M NaOH solution was used in this titration, which statement correctly explains point B on the curve?
This is the equivalence point of the curve.
0.003 mol of OH– ions are present in the flask at this point.
0.0005 is the number of excess moles of OH– ions at this point.
0.0005 is the number of moles of H+ ions present at this point.

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? atom p has an estimated zeff of 7 and is therefore to the left of atom q, which has a zeff of 6. atom p has an estimated zeff of 7 and is therefore to the right of atom q, which has a zeff of 6. atom p has an estimated zeff of 5 and is therefore below atom q, which has a zeff of 4. atom p has an estimated zeff of 5 and is therefore above atom q, which has a zeff of 4.