6. Changes inside the atom:radioactive decay

April 9, 2023

α β γThe mass number: 4 0 0The atomic number: 2 -1 0

Aims

• Describe the randomness of radioactive decay

• Describe atomic structure, in terms of nucleus, proton and neutron

• Explain how new elements are produced by radioactive decay

How to do experiments safely

• Clear desk and place on your stool under the desk

• No sitting down during practicals

• Collect and wear safety gear at all times

• One way system to reduce accidents

• Walk, don’t run

• Ask if you are ever unsure!

Using a Bunsen burner

• Collect equipment, share between group• Examine equipment to see if there is any

damage• Check gas tap is working and connect• Close air hole to ensure safety flame• Leave on safety flame when not heating• Heat on purple flame only• Pack away while you wait• Equipment will be hot, leave to cool down

How long does a piece of popcorn take to pop?

• Your task is to pop three different pieces of popcorn and determine how long it takes in second to pop a piece of popcorn

• You will need– Heating equipment (Bunsen burner, heatproof

mat, tripod, tripod)– Three random pieces of popcorn– Aluminium foil– Oil

Method

• Place a few drops of oil on your aluminium foil and gently heat it using the purple bunsen flame

• When the oil appears hot place your popcorn in AND start the timer

• Repeat this at least three times and record the values (give the date to me at the front to record on excel)

• Write up your experiment, including a conclusion.

Conclusion

• What did you notice about the time taken for a piece of popcorn to pop?

• Can you predict when a piece will pop?• Compare your values with the rest of the

class.• Why else is there uncertainty?• Relate this to when you heard the clicks

from the GM tube when we looked at the sources.