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Chemistry Ch. 2

section 2.1-2.6

Law of Conservation of Mass states - matter is neither created or destroyed
The smallest unit of an element is called an: element
What are the 3 laws that led to Dalton's atomic theory? 1. Law of conservation of mass 2. Law of definite proportions 3. Law of multiple proportions
When a chemical reaction occurs, the _____ does not change total mass of the substances
mass of reactants = mass of product
Law of definite proportions states: all samples, regardless of their source, has the same proportions of their elements
Law of multiple proportions states: when 2 elements form 2 different compounds, the mass ratio should be a whole number
Electrons has a ___ charge positive
Neutrons have a ___ charge neutral
Protons have a ___ charge negative
JJ Thomson did an experiment with ___ discovering ___ cathode rays; electrons
What are cathode rays? A beam of particles
Who discovered the charge ratio of electron? JJ Thomson
JJ Thomson is known for the ____ model plum-pudding model
If the cathode rays were positively charged, this deflects towards the ___ plate negative
What was accounted in Rutherford's gold foil experiment? 1. small size of nucleus 2. charge on nucleus 3. existence of protons 4. presence of electrons outside nucleus
What is the nucleus made up of? protons and neutrons
All masses are based on ___ carbon
What is the atomic number? number of protons in nucleus
The mass number is the ____ sum of protons and neutrons
Rutherford's gold foil experiment stated there must be a dense core in center of atom
In neutral atoms, the number of protons will ALWAYS ___ equal the number of electrons
Who said "atoms are mostly empty space"? Rutherford
When protons outweigh electrons, the isotope is ___ positive
When electrons outweigh protons, the isotope is ___ negative
When protons & electrons are equal, the isotope is __ neutral
When atoms have the SAME number of protons, but DIFFERENT numbers of neutrons, they are called: isotopes
A negative electrode is called a cathode
A positive electrode is called an anode
The difference between the mass number and atomic number are called: neutrons
Protons can be found by taking the: atomic number of an element
Ions are formed when we: lose or gain electrons
When we change the number of ___, we are considering a different element all together protons
Cations form when ___ electrons are LOST
Cations are ___ charged positively
Anion are ___ charged negatively
Anions form when electrons are ___ electrons are GAINED
Created by: Mariahj25



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