Revise

Question 1

Rearrange KE = ½mv2 to give v

Answer 1

v = √2KE/m

Question 2

Equation for t

Answer 2

t=d/v

Question 3

Combine KE = ½mv2 & t=d/v

Answer 3

t = d√m/2KE

Question 4

A sample of nickel was analysed and one of the isotopes found was 59Ni. The ions were accelerated to have 1.000 x 10-16 J of kinetic energy and travelled through a flight tube that was 0.8000 m long.
How long would one ion of 59Ni+ take to travel along the flight tube?
The Avogadro constant L = 6.022 × 1023 mol–1

Answer 4

Mass of one ion of 59Ni+ = mass of one mole of 59Ni+ ÷ Avogadro constant
= 59 ÷ 6.022 × 10(23) = 9.797x10(-23) g
= 9.797x10(-26) kg
t = d√m/2KE
t= 0.8000 √( 9.797x10(-26)/(2 x 1.000 x 10-16)
t=1.771X10-5 s

Question 5

What is electron configuration of Fe to Fe3+?

Answer 5

Fe 4s2 3d6
Fe3+ [Ar] 3d5