Top answers

Work out the number of electrons, protons and neutrons in Silicon 29 isotope.

First look at the periodic table to find the atomic number - 14.Then if it is a stable atom with no valency, the electron number will be equal to the proton number - 14.To work out the number of neutrons, su...
JA
Answered by Jamal A. • Chemistry tutor
4151 Views

Why is phenol nitrated more readily than benzene

The electron density in the phenol ring is higher than that of the benzene ring due to the presence of the OH group. This allows the electron substitution reaction to happen without a sulphuric acid catalyst.
Answered by • Chemistry tutor
2743 Views

Explain the decrease in reactivity of Group 2 elements as you go down the periodic table

Group 2 elements are metals that all form cations in a chemical reaction. This means they lose their valence electrons to become positive (2+) ions. Their reactivity depends on how easily the atoms can lose ...
HS
Answered by Hannah S. • Chemistry tutor
5281 Views

What type of reaction do haloalkanes undergo with nucleophiles?

Halogens are electronegative than the adjacent carbon atoms in haloalkanes.Therefore they have a tendency to attract the pair of electrons in a covalent bond, forming a polar bond.The carbon becomes electron...
Answered by • Chemistry tutor
2302 Views

When 80.0cm^3 of 0.500 M hydrochloric acid was added to 1.75g of impure CaCO3, not all HCl reacts. The unreacted HCl required 22.4 cm^3 of a 0.500 M solution of NaOH for complete reaction. Calculate percentage by mass of CaCO3 in the impure sample.

Balanced equations: CaCO 3 + 2 HCl --> CaCl 2 + H 2 O + CO 2 , HCl + NaOH --> NaCl + H 2 O HCl moles that react overall: (80.0 cm 3 x 0.500 mol dm 3 ) / 1000 dm 3 cm -3 = 4.00 x 10 -2 mol HCl moles tha...
Answered by • Chemistry tutor
2243 Views