transition metal ions

Question 1

Ti3+

Answer 1

purple

Question 2

V2+

Answer 2

purple

Question 3

V3+

Answer 3

green

Question 4

V4+

Answer 4

blue

Question 5

V5+

Answer 5

yellow

Question 6

Cr2+

Answer 6

blue

Question 7

Cr3+

Answer 7

green

Question 8

Cr6+

Answer 8

orange

Question 9

Mn2+

Answer 9

pale pink

Question 10

Mn6+

Answer 10

green

Question 11

Mn7+

Answer 11

violet

Question 12

Mn4+

Answer 12

brown

Question 13

Fe2+

Answer 13

pale green

Question 14

Fe3+

Answer 14

yelloq

Question 15

Co2+

Answer 15

pink-purple

Question 16

Co3+

Answer 16

green

Question 17

Ni2+

Answer 17

green

Question 18

Cu2+

Answer 18

blue

Question 19

how do you write a Kp expression?

Answer 19

H2 + I2 –> –< 2HI
Kp = p(HI)2
————-
p(H2) p(I2)

Question 20

what happens to the value of the rate constant k when temperature increases?

Answer 20

it increases. for many reactions increasing the temperature by 10C doubles the rate constant

Question 21

what happens to K if the temperature increases when the forward reaction is exothermic?

Answer 21

K will decrease, the equilibrium yeild of products will decrease.

Question 22

what happens to K if the temperature increases when the forward reaction is endothermic?

Answer 22

the equilibrium constant increases, the equilibrium yeild of products increases.

Question 23

what is the effect on K of increasing the pressure/concentration in a system?

Answer 23

K will not change. when the concentration increases the system is no longer in equilibrium. the concentrations change to return the ratio back to the K value. this means the position of equilibrium will change but not the value of Kc or Kp.

Question 24

define the term standard enthalpy change of formation

Answer 24

the enthalpy change that takes place when one mole of a compound is formed from its elements under standard conditions, with all reactants and products in their standard states.

Question 25

define the term standard enthalpy change of atomisation

Answer 25

the enthalpy change that takes place when one mole of gaseous atoms are formed from the element in its standard state under standard conditions

Question 26

define the term first ionisation energy

Answer 26

the enthalpy change required to remove one electron from each atom in a mole of gaseous atoms to form a mole of gaseous +1 ions

Question 27

define the term first electron affinity

Answer 27

the enthalpy change that takes place when one electron is added to each atom in a mole of gaseous atoms to form gaseous 1- ions

Question 28

define the term enthalpy change of solution

Answer 28

the enthalpy change that takes place when one mole of a solute dissolves in a solvent, forming aqueous ions

Question 29

what is the entalpy change of hydration?

Answer 29

the enthalpy change that accompanies the dissolving of gaseous ions to form one mole of aqueous ions