A weighted average which takes into account that there are not equal amounts of all isotopes.

Express the amount of each type

Magic numbers of protons or neutrons (2, 8, 20, 50, 86, 126) which exhibit enhanced stability due to full electron shells)

Neutron transformed into proton, emitting electron

Positron Emission (Probably not on the test)

Proton transformed into neutron releasing a positron and a neutrino (same mass, opposite charge)

High energy photon emitted with high penetration abilities, so protection from nuclear reaction needed (often after alpha decay or beta decay).

Pure Substances: Element

Simplest form of matter, made of one type of atom.

Pure Substances: Compound

More complex than elements made of two or more different elements.

Any matter that has pure and unchanging composition (consistent)

Physical blend of two or more substances

Mixture whose components vary throught the sample (lucky charms, trail mix)

Mixture is a solid, liquid or gas that has the same proportions of its components throught any given sample.

A quality of a substance that does not affect its chemical composition (boiling point, shape, mass, volume and melting point)

A change in matter which alters the chemical composition (burn, rot, rust, decompose)

Evidence of a Chemical Reaction

1. Formation of a gas, 2. Change in color, 3. Change in energy, 4. Change in smell or tase, 5. Formation of a precipitate

Splitting of heavy nuclei which occurs when the nucleus splits into two lighter nuclei, releasing energy, and neutrons

Occurs when light nuclei overcome electrostatic repulsion and merge forming heavy nuclei, releasing energy.

The exact time required for exactly half of radioactive nuclei in a sample to decay.

N=Nsub0 x (1/2)^n where n is what?

n = time in years elapsed/half life of the isotope

Considered the father of the periodic table and organized elements by increasing atomic mass, revealing properties that no on had recognized before

Lanthanides and Actinides

Both below the periodic table and are

What information must you have about an atom to determine which element it is?

It's atomic # or the # of protons.

Each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons.

Help

Options

focusNode

Didn't know it?
click below

Knew it?
click below

Don't Know

Remaining cards (0)

Know

retry

shuffle

restart

0:00

Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

Normal Size Small Size show me how

Unit 2 Test

Question	Answer
What does 1 AMU represent	1/12 of a Carbon 12 atom
Average Atomic Mass	A weighted average which takes into account that there are not equal amounts of all isotopes.
Percent Abundance	Express the amount of each type
Magic Numbers	Magic numbers of protons or neutrons (2, 8, 20, 50, 86, 126) which exhibit enhanced stability due to full electron shells)
Beta Decay	Neutron transformed into proton, emitting electron
Positron Emission (Probably not on the test)	Proton transformed into neutron releasing a positron and a neutrino (same mass, opposite charge)
Gamma Decay	High energy photon emitted with high penetration abilities, so protection from nuclear reaction needed (often after alpha decay or beta decay).
Why Decay Happens	Too Many Neutrons (Beta Decay)
Pure Substances: Element	Simplest form of matter, made of one type of atom.
Pure Substances: Compound	More complex than elements made of two or more different elements.
Pure Substance	Any matter that has pure and unchanging composition (consistent)
Mixtures	Physical blend of two or more substances
Heterogenous Mixture	Mixture whose components vary throught the sample (lucky charms, trail mix)
Homogenous Mixture	Mixture is a solid, liquid or gas that has the same proportions of its components throught any given sample.
Physical Properties	A quality of a substance that does not affect its chemical composition (boiling point, shape, mass, volume and melting point)
Chemical Change	A change in matter which alters the chemical composition (burn, rot, rust, decompose)
Evidence of a Chemical Reaction	1. Formation of a gas, 2. Change in color, 3. Change in energy, 4. Change in smell or tase, 5. Formation of a precipitate
Fission	Splitting of heavy nuclei which occurs when the nucleus splits into two lighter nuclei, releasing energy, and neutrons
Nuclear Fusion	Occurs when light nuclei overcome electrostatic repulsion and merge forming heavy nuclei, releasing energy.
Half-Life	The exact time required for exactly half of radioactive nuclei in a sample to decay.
N=Nsub0 x (1/2)^n where n is what?	n = time in years elapsed/half life of the isotope
Periodic Table Groups	Vertical Columns
Dmitri Mendeleev	Considered the father of the periodic table and organized elements by increasing atomic mass, revealing properties that no on had recognized before
Lanthanides and Actinides	Both below the periodic table and are
Protons and Neutrons Weigh How Many Times the Mass of a Neutron?	1000x
What information must you have about an atom to determine which element it is?	It's atomic # or the # of protons.
Isotope	Each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons.

Created by: WonderingTraitor

"Know" box contains:
Time elapsed:
Retries: