Compound/Molecule Review
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Created by:
nacholibre621 on January 14, 2011
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22 terms
Terms | Definitions |
|---|---|
 What are the four states of matter | solid, liquid, gas, and plasma |
| Melting Point | the temperature at which a substance changes from a solid to a liquid |
| Boiling Point | the temperature at which a substance changes from a liquid to a gas |
| What causes matter to change from one state to another? | changes in temperature |
| Covalent Bond | a bond formed when atoms share one or more pairs of electrons |
| Ionic Bond | a chemical bond in which one atom loses an electron to form a positive ion and the other atom gains to electron to form a negative ion |
| What does the flame test indicate? | What the cations are in the solution (cations are the positive charged ions) |
| What is a Formula Weight? | the total mass of a compound sum(atomic mass x # of the element) |
| What is a molecule? | A chemical structure that is made of two or more atoms that are bonded together |
| What is a compound? | A molecule that is made of two or more DIFFERENT elements |
| Non-metal | elements that lack most of the properties of metals |
| Metalloids | They are the border between metals and non-metals |
| nuclear reaction | when a reaction changes a part of the nucleus in an atom |
| radioactive decay | when unstable isotopes release particles and energy |
| radioactivity | when radiation is spread out by an unstable ducleus |
| alpha particle | this particle is made up of 2 protons, 2 neutrons and is positively chaged |
| beta particle | The other part of the broken neutron in an unstable nucleus other than the new proton |
| gamma radiation | high-energy waves moving at the speed of light that doesn't change the atomic mass & number |
| half-life | time it takes for half of a radioactive isotope to decay |
| radioactive dating | calculating the amount of half-lives passed by the radiation produced to find the age of the rock/fossil |
| tracer | radioactive isotopes that can be used to study reacctions in living organisms |
| What are the different types of metals? | Alkali metals, Alkaline earth metals, Transition metals, Metals in mixed groups, Lanthanides and Actinides |
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