Thermodynamics

Question 1

What is the standard molar enthalpy of formation?

Answer 1

Enthalpy change when one mole of compound is formed from its constituent elements

Question 2

What is enthalpy of combustion?

Answer 2

Enthalpy change when one mole of substance is completely burnt in oxygen

Question 3

What is enthalpy of atomisation?

Answer 3

Accompanies the formation of one mole of gaseous atoms from the element in its standard state under standard conditions

Question 4

What is the first ionisation energy?

Answer 4

Standard enthalpy change when one mole of gaseous atoms is converted into a mole of gaseous ions each with a single positive charge

Question 5

What is second ionisation energy?

Answer 5

Loss of a mole of electrons from a mole of singly positively charged ions

Question 6

What is first electron affinity

Answer 6

A mole of gaseous atoms is converted to a mole of gaseous ions each with a single negative charge

Question 7

What is the second electron affinity?

Answer 7

One mole of electrons is added to a mole of gaseous ions each with a single negative charge to form ions each with 2 negative charges

Question 8

Define lattice enthalpy of formation

Answer 8

One mole of solid ionic compound is formed from its gaseous ions

Question 9

Define enthalpy of hydration

Answer 9

Water molecules surround one mole of gaseous ions

Question 10

Define enthalpy of solution

Answer 10

One mole of solute dissolves completely in sufficient solvent to form a solution in which the molecules are far apart enough not to interact with each other

Question 11

What is mean bond enthalpy?

Answer 11

One mole of gaseous molecules each breaks a covalent bond to form two free radicals, averaged over a range of compounds