Transition Elements and Reaction Rates

This video provides top tips and reminders for the A-level chemistry paper, focusing on the OC specification. It covers key topics such as rate of reaction, equilibrium, acids and bases, enthalpy and entropy, electrode potentials, and transition elements. The video aims to help students understand these concepts through predictions and examples, preparing them for the exam.

What is the rate of reaction if the concentration of a reactant doubles and the rate remains unchanged?

• Order three

• Order two

• Order one

• Order zero

In a rate concentration graph, which order of reaction is represented by a straight line through the origin?

• Order two

• Order three

• Order one

• Order zero

What happens to the equilibrium constant (KC) if the temperature of a reaction changes?

• KC remains constant

• KC increases

• KC changes

• KC decreases

According to Le Chatelier's principle, what effect does increasing pressure have on a reaction with more moles of gas on the reactant side?

• Decreases the rate

• No effect

• Favors the forward reaction

• Favors the reverse reaction

Which of the following is true for a conjugate acid-base pair?

• They differ by a molecule

• They differ by a neutron

• They differ by an electron

• They differ by a proton

What is the pH at the equivalence point for a strong acid-strong base titration?

• Less than 7

• Equal to 7

• Cannot be determined

• Greater than 7

In the Gibbs free energy equation, what does Delta G represent?

• Enthalpy change

• Entropy change

• Free energy change

• Temperature change

What is the specific heat capacity of water used in calorimetry calculations?

• 3.18 J/g°C

• 5.18 J/g°C

• 4.18 J/g°C

• 2.18 J/g°C

In a hydrogen fuel cell, where does the oxygen come from?

• A tank

• The air

• A chemical reaction

• Stored inside the cell

Which property is NOT typical of transition elements?

• Non-conductors of electricity

• Variable oxidation states

• High melting points

• Forming colored compounds