Search our library of Chemistry GCSE questions

Top answers

Chemistry

GCSE

Describe what happens when 2 atoms of Potassium react with one atom of Sulphur

Potassium has 1 electron in its outer shell whilst Sulphur has 6 electrons in its outer shell, this can be deduced from the periodic table as Potassium is in group 1 and Sulphur group 6. When the two reac...

Answered by Alexander H. • Chemistry tutor

2918 Views

What is a titration?

Titrations are used to make soluble salts (remember solubility rules) from an acid and an alkali. There are no solids involved in this reaction and the solutions made are colourless so there is no way of ...

Answered by Beatrix H. • Chemistry tutor

2268 Views

Compare the advantages and disadvantages of using bioethanol over fossil fuels.

Bioethanol is a renewable fuel produced from plants, which photosynthesise to grow, taking in carbon dioxide and producing oxygen. This means there is no net increase in carbon dioxide, which is a greenho...

Answered by Michael I. • Chemistry tutor

2964 Views

What mass of calcium carbonate would you need to react with dilute hydrochloric acid to produce 10 g calcium chloride?

Equation: CaCO₃ + 2HCl --> CaCl₂ + CO₂ + H₂O [Ca_40.1 C₁₂ O₁₆ Cl_35.5]ANSWER: 9.1 g

Answered by Sam H. • Chemistry tutor

2274 Views

How does an increase in temperature affect the rate of a reaction?

Increasing the temperature of a reaction means increasing the kinetic energy of each particle in the reaction. Increasing a particle's kinetic energy means the particle is moving faster ('Kinetic' indicat...

Answered by Kazimierz W. • Chemistry tutor

2365 Views