Search our library of Chemistry GCSE questions

Top answers

Chemistry

GCSE

Explain why ionic substances have high melting points?

Ionic substances have high melting points because a lot of energy is required to break the strong, electrostatic forces of attraction between the oppositely charged ion in the ionic substance.

Answered by Arunima B. • Chemistry tutor

2053 Views

What are the similarities and differences between atoms of the isotopes Cl-35 and Cl-37

The numbers 35 and 37 are the mass numbers for the two isotopes of chlorine. They both have the same atomic number(proton number) as they are the same element, hence they also have the same number of elec...

Answered by Arunima B. • Chemistry tutor

24014 Views

What are the 2 methods used to manufacture ethanol? What are the advantages and disadvantages of both?

The hydration of ethene: Ethene and steam are passed over a catalyst - concentrated phosphoric acid (H₃PO₄) - at 300^OC and 60-70 atmospheres. This process is fast, continu...

Answered by James P. • Chemistry tutor

7115 Views

Sodium Hydroxide can react with sulfuric acid in an acid base reaction. Outline the equation for this reaction, name the product. Finally a titration reaction is conducted. Determine the mass of NaOH needed to neutralise 12.4cm^3 of 0.10moldm^-3 H2SO4.

The equation is outlined below: 2NaOH + H₂SO₄------->> Na₂SO₄+ 2H₂OAs explained in the question this is an acid base reaction, where the ...

Answered by Thomas M. • Chemistry tutor

34567 Views

Describe the process of distillation

Distillation is the process of boiling and condensing a mixture of liquids in a closed system, allowing the products to escape. This can separate products because the one with the lower boiling point will...

Answered by John A. • Chemistry tutor

2523 Views