Vocabulary
Alpha particles, beta particles and/or gamma rays are given off when this type of reaction occurs.
Radioactive Decay
When Radium-226 undergoes an alpha decay
Radon-222
This amount of a substance remains after 2 half lives:
1/4
Rust is an example of this type of change
a chemical change
This the name of certian elements with the same number of protons but different number of neutrons
isotopes
This term refers to both the protons and neutrons inside the dense nucleus.
a nuclide or nucleon
When Lead-210 goes through a beta decay
Bismuth-210
This amount of a substance decays after 3 half-lives
7/8
A mixture involving two or more distinct layers is called a ____________ ___________.
a heterogeneous mixture
(True or false) All nuclear reactions change the identity of an element
false (gamma rays do not)
This type of nuclear radiation is the most penetrating
a gamma ray
When Thorium 230 goes through an alpha decay
Radium-226
I-131 is used to treat thyroid cancer. If you ingest a 20 mg sample of I-131, this amount of days will it take until there is only 2.5 mg of I-131 left in your body? (half-life of I-131 = 8 days)
24
If fuzzy wuzzy was a bear, and fuzzy wuzzy had no hair... Just kidding. Without consulting your textbook, what is the name of the element 'Ra'?
Radium
Three objects can stop gamma rays. Name two.
lead and concrete (and water)
This type of decay particle is a helium nucleus
an alpha particle
When Uranium-238 goes through 2 alpha decays
Radium-230
You have a sample that is now contains 40 g of Actinium-227. This many grams of Actinium-227 must have been in the sample 44 years ago (Half-life of Actinium is 22 years).
160
What does STP condition mean? What are the values of T and P at STP? (any unit)
Standard Temperature and Pressure
P=1 atm = 760 mmHg = 101.3 kPa
T= 0 C = 273 K
This is the reason that certian unstable radioisotopes give of alpha, beta and gamma rays
to become stable
What is the term that means “the time it takes for half of the radioactive atoms in a sample to decay.”
a half life
When Protactinium-91 goes through a beta decay and then an alpha decay
Thorium-89
The half-life of radium-226 is 1599 years, this amount is left after 4797 years if you have a 250 grams sample right now?
2000 g
These two properties of atoms were discovered when Rutherford bombarded gold foil. Must name both for points.
atom is mostly empty space AND a positively charged nucleus is at the center of the atom
This is the term referring to a nuclear reaction involving two small nuclei that "fuse" into one bigger nuclei. (It fuels stars including our sun)
fusion