Question 5 -
Ais a solution of mineral acid containing 0.06moldm
Bis a solution of sodium hydroxide containing 4.0gdm
A student titrated solution A against 25.0cm portion of B using methyl orange indicator. His
result is presented in the table below.
Titrations
1
2.
3
Final burette reading(cm)
2.80 21.50
24.00
Initial burette reading (cm)
01.30
0.100 89.50
Volume of acid used (cm)
20.50
121.40
20.50
With the information provided above .Calculate the (a)Amount of acid in the average titre (b)concentration of sodium hydroxide in mol/dm-3 (c)Amount of sodium hydroxide in the volume of Pipette (d)Mole ratio of acid to base in the reaction

"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence,   the electronegativity (or the ability to attract electrons) is lessened."

1.43 x 10^-11 j the guy commented the awnser just making sure u see it .

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.