Across
- 8. The average value of the bond dissociation enthalpy for a given type of bond taken from a range of different compounds.
- 9. Describes a reaction in which heat energy is taken in from the surroundings – we experience a temperature drop.
- 10. The enthalpy change when 1 mole of a substance is completely burned in oxygen with all reactants and products in their standard states under standard conditions (298K and 100kPa).
- 11. An instrument for measuring the heat changes that accompany chemical reactions.
Down
- 1. The enthalpy change when 1 mole of substance is formed from it’s elements with all reactants and products in their standard states under standard conditions (298K and 100kPa).
- 2. Describes a reaction in which heat energy is given out by the chemical system – we experience a temperature rise.
- 3. change A measure of heat energy given out or taken in when a chemical or physical change occurs at constant pressure.
- 4. The amount of heat needed to raise the temperature of 1g of a substance by 1K.
- 5. A combustion reaction in which there is insufficient oxygen for all the carbon in the fuel to burn to carbon dioxide. Carbon monoxide and/or soot are formed.
- 6. A reaction in which water is added.
- 7. A sequence of chemical reactions (with their enthalpy changes) that convert a reactant into a product. The total enthalpy change of the sequence of reactions will be the same as that for the conversion of the reactant to the product directly (or by any other route).