Chapter 2 Flashcards
Proton
A subatomic particle with a positive charge and has a lot of mass.
Nuetron
A subatomic particle with no charge
Electron
a subatomic particle with a negative charge. Has almost no mass
Atom
The smallest part of an atom
Isotope
This is when the atoms of an element have different masses
Mole
The amount of substance that contains 6.022 x 10^ 23
Avrogado’s Number
Same as a mole. 6.022 x 10^ 23
Molar Mass
The mass of 6.022 x 10^23 atoms
Atomic Mass Unit
The number underneath of the element on the periodic table.
Periodic Table
An arrangement of elements that lets scientists predict the properties of an element.
Molecule
A combination of 2 or more atoms
What is the Law of Conservation of Mass?
It states the matter is neither created nor destroyed during a chemical change
What is the law of definite proportions?
It’s states that a compound always contains the same elements in certain definite proportion and I know others.
What is the law of multiple proportions?
It states that elements might combined more than one set of proportions, with each set the corresponding to a different compound. Example: carbon dioxide and carbon monoxide
What is the atomic theory?
It is Daltons theory of what matter was composed of, how elements were formed, as well as compounds in chemical reactions. The only unmodified atomic theory is that chemists still believe that compounds are formed of different elements and have to have fixed proportions.
