A Level Chemistry Definitions

What is the formula that shows the arrangement of atoms in the molecule of a compound?

• Displayed formula

• Structural formula

• Molecular formula

• Empirical formula

In which type of reaction is a small molecule such as HCI or H₂O removed from a molecule?

• Addition

• Elimination

• Substitution

• Condensation

What is the term for a species which donates pairs of electrons and is usually attracted to positive charge?

• Enantiomers

• Nucleophile

• Electrophile

• Chiral centre

What is the enthalpy change when 1 mole of an ionic compound is formed from its gaseous ions under standard conditions?

• Electron affinity

• Lattice energy

• Standard enthalpy change of solution

• Standard enthalpy change of atomisation

What is the measure of randomness or disorder of a system at a specific temperature?

• Bond energy

• Specific heat capacity

• Entropy

• Average bond energy

What is the power to which the concentration of a particular reactant is raised in the rate equation?

• Half-life-time

• Order of reaction w.r.t. a particular reactant

• Overall order of reaction

• Rate of reaction

What is the potential difference between a standard hydrogen electrode and a metal immersed in a solution containing metal ions at 1.0 mol dm³ concentration at 25°C and at 1 atmospheric pressure?

• Electrode potential

• Standard electrode potential

• Standard cell potential

• Standard reduction potential

What is the mass of substance liberated at an electrode during electrolysis directly proportional to?

• The concentration of the electrolyte

• The number of charges on the ion

• The number of faradays required to discharge one mole of an ion at an electrode

• The quantity of electricity passed through the electrolyte

What is the formula that shows the arrangement of atoms in the molecule of a compound?

• Displayed formula

• Empirical formula

• Molecular formula

• Structural formula

In which type of reaction is a small molecule such as HCI or H₂O removed from a molecule?

• Elimination

• Substitution

• Condensation

• Addition