Higher Chemistry: Unit 1 (Chemical Changes & Structure)

An experiment was repeated at two different temperatures. The red line represents experiment A and the Blue line represents experiment B. Which experiment was done at the higher temperature?

• Experiment B (Blue line)

• Both are the same temperature

• Experiment A (red line)

What is the minimum amount of energy required for a reaction to take place?

Look at the diagram. Is the reaction Exothermic or Endothermic?

• Exothermic

• Endothermic

Calculate the enthalpy change for the forward reaction.

Show on the diagram the effect of a catalyst being added

Answer explanation

Activation energy will be lower

What is the relative rate of reaction for a reaction that took 40 seconds to complete? (units not required)

What are the correct units for relative rate of reaction?

• mol/L

• mol/s

• s-1

Does electronegativity increase or decrease along a period of the periodic table?

• Increase

• Decrease

• Stay the same

Why does electronegativity decrease down a group?

What state must an element be in to find it's correct first ionization energy?