HESI A2 test Chemistry - Nuclear Chemistry

What percentage of an original sample of iodine-131 will remain after 64 days if iodine-131 has a half-life of 8 days?

0.39 %

F-21 has a half-life of 5 seconds. How long will it take a 50 g sample of F-21 to decay to a mass of 12.5 g?

10s

The half-life of As-81 is 33 seconds. If only 12.5 g of a 100.0 g sample of As-81 is left, how long did it take for the original sample to decay to its current mass?

99s

Cesium-137 has a half-life of 30 years. If a 2.0 g sample of cesium-137 decays over 120 years, how much would remain?

0.125 g

What are the two types of particles that can be emitted during beta decay?

Positron and electron

How many days will it take 128 kilograms of a radioactive substance to decay to 16 kilograms if it has a half-life of 32 days?

96

Which of the following is emitted during beta decay?

Electron

What type of radiation produces a particle with no mass?

Gamma radiation

During which type of radiation is a Helium nucleus emitted?

Alpha radiation