Chemical Reactions And Energy

Question 1

Standard Enthalpy Change of Reaction

Answer 1

The standard enthalpy change of reaction is the enthalpy change when molar quantities of reactants, as stated in the equation , react together under standard conditions to give product.

Question 2

Standard Enthalpy Change of Formation

Answer 2

The enthalpy change when one mole of the substance is formed from its elements in their standard states under standard conditions.

Question 3

Specific heat capacity

Answer 3

The amount of heat required to raise the temperature of 1 g of the substance by 1 K (or 1*C)

Question 4

Standard Enthalpy change of combustion

Answer 4

The Enthalpy change when one mole of the substance is completely burnt in oxygen under standard conditions

Question 5

Standard Enthalpy change of neutralization

Answer 5

The Enthalpy change when an acid reacts with an alkali to form one mole of water under standard conditions

Question 6

Hess’s Law

Answer 6

The total enthalpy change in a chemical reaction is independent of the pathway between the initial;l and final states

Question 7

enthalpy change

Answer 7

The heat released or taken in during any change in a system, provided that the system is kept at constant pressure