Nuclear Reaction

You have 20 grams of uranium that has a half-life of 2 seconds, how much will be left after 4 seconds?

• 5 grams

• 2 seconds

• 6 grams

• 8 grams

Tags

NGSS.HS-PS1-8

Nuclear fission of uranium-235 can start a chain reaction by

• releasing enough thermal energy to start nuclear fission in neighboring atoms

• producing two smaller atoms that can then strike and split neighboring atoms

• producing neutrons that can then strike and split neighboring atoms

• combining two atoms with low mass to form one large atom

Tags

NGSS.HS-PS1-8

The half life of iodine-131 is 8.040 days. What percentage of an iodine-131 sample will remain after 40.20 days?

• 312.5%

• 31.25%

• .3125%

• 3.125%

When nuclei decay, massive amounts of __________ is released.

• energy

• electrons

• protons

• neutrons

Tags

NGSS.HS-PS1-8

Process by which nuclei having small masses combine to form a nucleus with a heavier mass is...

• nuclear fission

• a chemical reaction

• nuclear fusion

• a chain reaction

Tags

NGSS.HS-PS1-8

The force that holds neutrons and protons together in the nucleus is known as the:

• weak nuclear force

• hydrogen bonding

• strong nuclear force

• electronegative force

Sodium-24 has a half-life of 15 hours. How much sodium-24 will remain in an 18.0 g sample after 60 hours?

• 2.25 g

• 1.125 g

• 4.5 g

Tags

NGSS.HS-PS1-8

Nitrogen-16 has a half-life of 7.2 seconds. How much nitrogen-16 will remain in a 100 g sample in 21.6 seconds?

• 12.5 g

• 25 g

• 2 g

Tags

NGSS.HS-PS1-8

A radioactive nuclide has a ____ stable nucleus than a non-radioactive nucleus of the same element.

• more

• less

• identical

• small

Tags

NGSS.HS-PS1-8

Atoms of the same element that have different numbers of neutrons and different mass numbers:

• nucleons

• isotopes

• gamma rays

• ions

Tags

NGSS.HS-PS1-8