| A | B |
|---|
| Elements | Substances that can not be broken down |
| Compounds | substances which contain 2 or more elements |
| atomic theory | explains the relationship between elements and compounds |
| atoms | smallest particles of elements |
| molecule | two or more atoms joined together |
| chemical symbol | single or double letter to stand for an element |
| chemical formula | combination of chemical symbols which stand for a particular compound |
| proton | subatomic particle (+) charge |
| neutron | found in the nucleus () no charge |
| electron | high speed atomic particle (-) charge |
| chemical change | one or more new substances is formed with new properties |
| Physical change | no new substances are formed |
| Chemical reaction | another name for chemical change |
| Reactant | Any substance used up in a reaction |
| Product | A new substance produced in a reaction |
| _____________ | means "produces" in a chemical reaction |
| Scientific Law | Scientific statement that sums up the conclusion of many experiments |
| Law of conservation of mass | The total mass of the reactants is always equal to the total mass of the products |
| Combustion | Chemical reaction in which oxygen is a reactant and heat is given off/produced |
| Oxygen test | splint bursts into flame |
| Hydrogen test | splint gives off a loud "pop" |
| Carbon dioxide test | When bubbled through limewater, the limewater turns milky |
| Water test | Cobalt II paper will turn pink |
| energy | ability to do work |
| Albert Einstein | Author of E = mc ... famous scientist |
| Exothermic reaction | Energy is released ...combustion |
| Endothermic reactions | need to absorb energy in order to happen...frying an egg |
| Acids | taste sour, are soluable in water |
| Bases | taste bitter, feel slippery, react with acids |
| Neutral | A substance which is neither acidic or basic |
| Ph scale | Measurs acidity level of various substances. Scale of O to 14 |
| Reaction rate | Speed of a chemical reaction |
| Concentration | How strong or weak a solution is (dilute is weak; concentrated is strong) |
| Metals | Elements which are usually hard and often shiny. Can be pulled into wires or rolled into sheets. |
| Corrosion | The eating away of metals - rusts. |
| Alloys | Combination of different metals that resist corrosion or rusting. |
