Chemistry Two

How do we determine average isotopic mass?
- multiply the mass of the element by its relative abundancy
- *** if there are multiple isotopes, after multiplying, add them together***
What is the problem with weighing out atoms?
What is the solution
- not possible
- we come up with moles, a collection of individual things put together
What is Avogadro's Number?

ONe mole of any substance contains 6.022 x 10²³ formula units
What is molar mass?
- the mas in grams of one mole of any element
- numerically equivalent to its atomic mass
What is a nuclear equation?

a reaction that changes an atomic nucleus
In a nuclear equation, the:
__ does not change
__ changes
__ determines what element it is
- mass #
- # of protons and elections
- # of protons
Comparisons between Nuclear and Chemical Reactions
- changes an atom's nucleus, usually producing a different element
- Involves only a change in the way that different atoms are combined
- Different isotopes of an element have completely different behavior in nuclear reactions
- Different isotopes of an element have essentially the same behavior
The energy change accompanying a nuclear reaction is far greather than that accompanying a chemical reaction

Author

DesLee26

170606

Card Set

Chemistry Two

Description

Atoms, Molecules, Ions

Updated

2012-09-13T04:24:19Z