Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
16 Cards in this Set
- Front
- Back
Law of Conservation of Mass (Antoine Lavosier)
|
The total mass remains constant during a chemical reaction.
|
|
Law of Definite Proportions (Joseph Proust)
|
All samples of a cmpounds have the same composition, or all samples have the same proportions, by mass, of the elements present.
|
|
Law of Multiple Proportions (John Dalton)
|
In two or more compunds of the same two elements, the masses of one element that combine witha fixes mass of the second elment are in the ratio of small numbers.
|
|
Dalton's Atomic Theory to explain Laws
|
1. Matter is compposed of atoms; tiny, indivisible particles. 2. All atoms of a given element are the same. 3. Atoms of one element differ froma toms of other elements. 4. Compounds are formed when atoms of different elements unite in fixed proportions. 5. A chemical reaction involves rearrangement of atoms. No atoms are created, destroyed, or broken apart.
|
|
Subatomic Particles
|
Protons, Neutrons (located in the nucleous), and Electrons (oribting around the nucleus in shells)
|
|
AMU
|
(u) = 112 the mass of a C-12 atom. 1 u = 1.66054 X 10^-24g
|
|
Atoms are electrically neutral. What does this mean?
|
The number of protons equals the number of electrons
|
|
Isotopes
|
atoms that have the same number of protons but different number of neutrons
|
|
Atomic Mass
|
Represented by Z - the number of protons in the nucleus of a given atom of a given element.
|
|
Mass Number
|
Represented b A - an integral number that is the sum of the numbers of portons and neutrons in an atom.
|
|
How do you know the number of neutrons?
|
A - Z
|
|
How are symbols written?
|
E is element, A on top and Z on bottom (next to E)
|
|
What gives us the identification of the element?
|
The Atomic Number (Z)
|
|
Metals
|
Elements left of the zig-zag line in the periodic table
|
|
Non-metals
|
To the right of the line, including noble gases.
|
|
Metalloids
|
Elements that touch the zig-zag line, except Aluminum
|