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Chemsitry Test

Review for Chemistry Test

Atoms The smalllest parts of an element that retains the chemical properties of an element.
Elements A type of pure substance that can't be changed into a simpler substance. It is also only made up of one type of atom.
Matter Anything that takes up space is composed of matter including atom and molecules.
Protons Positvely charged molecules located in an atoms nucleus.
Electrons Negatively charged particles that orbit around the nucleus.
Neutrons Particles that have a neutral charge and are located in an atoms nucleus.
Democritus The first person to come up with the idea of atoms and to state that atoms are indivisble. He also said that dividing an object a multiple times will eventually lead you to an atom.
Dalton He proved Democritus's theory and he also added that atoms are to small to be seen with the naked eye.
Rutherford He used the gold foil experiment and found that atoms had a nucleus.
Thompson He was the scientist who came up with the plum pudding experiment to prove that elctrons are negatively charged.
Bohr He stated that electrons orbited around the atoms nucleus.
Compound A type of substance that is composed of two or more elements that are chemically combined. It is only able to turn into a simpler substance by a chemical change.
Mixture A substance that is composed of two or more different physically combined and they keep there own physical properties.
Heterogeneous Mixture A mixture that is not the same throughout the mixture and the componenets of the mixture can be distinguished with the naked eye.
Homogeneous Mixture A mixture that retains the same physical properties throughout the mixture and can't be visually distinguished with the naked eye.
Physical Properties A property that can be studied and observed without changing the matter being studied.
Color (Physical Property) The color of a pigment in a substance.
Density (Physical Property) The property that describes the realtionship between an objects mass and its volume.
Melting Point The temperature at which a pure substance melts.
Boiling Point The temperature at which a pure substance boils.
Chemical Properties Properties that can only be noticed when they undergo a change in chemical composition.
Ability to Burn A chemical process that involves an object or substance reacting quickly to oxygen and producing light and heat.
Ability to Rust A chemical process that invovles an object or substance reacting slowly with oxygen.
Physical Changes When a substance changes fom one state of matter to another and the composition of the object has not changed.
Changes in State of Matter When a substance changes from one state of matter to another.
Changes in Size or Shape When a substance changes from one size or shape to another.
Chemical Changes The result of the formation of one or more new substances with new physical and chemical properties.
Color Change When a substance changes color the chemical making of a subtance might have changed.
Temperature Change When a substance is combined with another substance there might be an increase or decrease in temperature.
Formation of a Precipatate When two substances are combined and a solid or a precipatate is formed.
Formation of a Gas When solids or liquids are combined they migt form gas bubbles.
Created by: RahJon