Science - Particles of Matter (ch. 1)
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32 terms
Terms | Definitions |
|---|---|
 atom | An __ is the smallest particle of an element. |
| Democritus | __ was a Greek philosopher who was one of the first people to think matter was made of atoms. |
| uncuttable | Democritus called the smallest piece of matter "atomos" meaning ____ |
| Dalton | In 1802, ___ proposed the atomic theory. |
| couldn't be broken into smaller pieces | Dalton believed that atoms __. |
| exactly alike | Dalton believed that in any element, all the atoms are ___ |
| different | Dalton believed that atoms of different elements are __ |
| compounds | Dalton believed that atoms of two or more elements combine to form __ |
| mass | Dalton believed dthat atoms of each element have a unique __ |
| constant ratio | Dalton believed that masses of the elements in a compound are always in a ___ |
| molecule | A __ is a group of atoms that are joined together and act as a single unit. |
| molecules | __ form the basic particle of a compound. |
| chemical bond | The force that holds two atoms together is a __ |
| two | Molecules can contain as many as billions of atoms, or a s few as __ atoms |
| water | One of the most simple molecules is the __ molecule |
| scanning tunneling microscope | The __ can magnify things so much that it can actually capture images of atoms. |
| inferences based on observations | Scientists studying atoms must make __ (educated guesses) about them based on ___ |
| models | one of the first atomic __ |
| iron and sulfur | Pyrite is a compound of __ and __. |
| fool's gold | Pyrite is often called "__". |
| density | Gold can be separated from a mixture of dirt and sand because of its ___. |
| greater | The density of gold is much ___ than the density of most other materials. |
| Put the mixture of dirt, sand, and gold in a shallow pan with water. Swirl it around and then dump the water off. The dirt and sand will be washed away with the water and the more dense gold will be left in the pan. | Gold miners used a technique called panning. Describe the technique of panning. |
| dredges | Today, gold mining is done using machines called __. |
| compounds | Most elements are usually found as __. |
| ore | A(n) __ is a rock that contains a metal or other useful material |
| chemical reaction | To obtain an element from its compound, it is necessary to cause a __to take place. |
| copper | One of the steps used to obtain __ from its ore is electrolysis. |
| electrolysis | One of the steps used to obtain copper from its ore is __. |
| electric cutting | The word electrolysis means "__". |
| Electrodes | __ are two metal strips used in electrolysis. |
| blast furnace | To remove iron from its ore, a __ is used. |
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