Search our library of Chemistry A Level questions

Top answers

Chemistry

A Level

Q1. Two beakers, A and B, each contain 100.0 cm^3 of 0.0125 mol/dm^3 nitric acid. Calculate the pH of the solution formed after 50.0 cm^3 of distilled water are added to beaker A. Give your answer to 2 decimal places.

A1. First it is important to know that nitric acid (HNO3) is a strong acid and so [HNO3] = [H+] Beaker A contains 100cm^3 = 100ml Final volume is 150ml (50cm^3 of distilled water is added to beaker...

Answered by Tutor51285 D. • Chemistry tutor

10059 Views

balance the following equation: Na2O + HCl --> NaCl + H2O

Na₂O + 2HCl --> 2NaCl + H₂O, easiest way to do this is to balance this equation is to write down all the atoms on both sides of the reaction. Its easiest to start with an element ...

Answered by Stephen A. • Chemistry tutor

21500 Views

Consider the following reaction: C2H4 + HBr -> ?. a) What is the product of the reaction? Name the compound and give the structural formula. b) What is the type of the reaction? c) Draw a reaction mechanism.

a) Bromoethane

b) Electrophilic addition

c) (Drawing of the mechanism)

Answered by Katerina P. • Chemistry tutor

3501 Views

Arrange the following elements in order of increasing ionization energy. Give an explanation. a) K, Cs, Na b) F, N, Be

a) Cs, Na, K The ionisation energy increases when going from bottom to top within a group due to electron shielding. b) Be, N, F The ionisation energy increases when going from left to right within a peri...

Answered by Katerina P. • Chemistry tutor

4592 Views

Regarding the first ionisation energies, why do the values shown on the graph go down from magnesium to aluminium and then rise again from aluminium to silicon

The first ionisation energy of an element is the energy required in order to remove the outermost electron from the element to make it an ion with the charge +1. From magnesium to aluminium the values sho...

Answered by Luwaiza M. • Chemistry tutor

14122 Views