Lecture 5

Question 1

Energy and mass are interchangeable - equation

Answer 1

E=mc^2

Question 2

Chemical reaction

Answer 2

Breaking or forming bonds (mass changes are negligible)

Question 3

Nuclear reaction

Answer 3

Enormous (mature mass changes)

Question 4

Nuclear binding energy

Answer 4

Energy required to separate nucleus of atom into protons and neutrons or the energy holding it all together - the greater the binding energy the more stable

Question 5

Mass defect

Answer 5

Mass of nucleus /= masses of individual nucleons in the nucleus

Question 6

Change in mass

Answer 6

The mass required to hold nuclear particles together

Question 7

Fission

Answer 7

Production of lighter nuclei by the decomposition of a heavier nucleus. Often but not always produced when a heavier nucleus captures a neutron

Question 8

Fusion

Answer 8

Production of heavier nucleus by combining lighter nucleus
-needs extreme temperatures
-expels enormous amounts of energy

Question 9

Nuclear fission vs radioactive decay

Answer 9

Nuclear fission- nucleus splits and releases N
Radioactive decay- unstable nucleus emits radiation

Question 10

Propagation

Answer 10

a process in which a reactive intermediate is continuously regenerated during the course of a chemical chain reaction