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Chemistry Test

Definition of Chemistry the study of matter and its behavior under different conditions
Definition of Matter makes up everything that takes up space and has weight
Definition of Elements a substance that contains only one atom. It can not be broken down in to simpler substances.
Definition of an Atom basic building blocks of all matter
Atomic Number Number of protons
Protons have a positive charge
Ernest Rutherford discovered that atoms have a very dense center (a nucleus). He also discovered that the nucleus is positively charged
Dmitri Mendeleev he created the periodic table.
Periodic Table of Elements organized by weight (left to right) and characteristics (up and down)
Atomic Weight found by averaging weights for different atoms of an atom
Neutrons have no charge (are neutral)
Neils Bohr put all the information together and developed the Bohr model
Definition of a Molecule the smallest combination of 1 or more atoms that are strongly bonded in a specific way
Electrons have a negative charge
Where are the protons located? in the center
where are the neutrons located? in the center
where are the electrons located? on the orbitals
what elements are man-made? 93+
how are molecules different then elements? they can be composed of more than one atom
Where does the word chemistry come from? the Arabic words for Egyptian Art
Who was the first person to use the word, "atom"? Democritus, as a way to describe something that can not be broken down any further
How small is an atom? It would take 50 million atoms to = 1 cm if they could be lined up side by side
How small are electrons? 1,837 electrons would equal the weight of one proton
How many protons does a atom have vs. electrons? it is an equal amount
How many elements were there in the mid to late 1800s? there were around 30 elements
How do you make a solid? By freezing a liquid
How do you make a liquid? By heating a solid
How do you make a gas? By boiling the liquid