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Chemsitry Test
Review for Chemistry Test
| Term | Definition |
|---|---|
| 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
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