click below
click below
Normal Size Small Size show me how
EOU test:Science
| Question | Answer |
|---|---|
| The amount of matter present in a particle or object | Mass |
| substances that are combined to form the products in a chemical reaction | reactants |
| The result of substances being combined in a chemical reaction | products |
| Smallest possible unit into which matter can be divided, while still maintaining its properties. Made up of protons, neutrons and electrons. | atoms |
| A substance made up of atoms of two or more different elements joined by chemical bonds | compound |
| describes the number of atoms present in a molecule | subscript |
| describes the number of molecules present in a reaction | coefficient |
| matter is transformed into a new substance by rearranging atoms | chemical reaction |
| demonstrate the same number and types of atoms in a chemical reaction | chemical equation |
| build a compound from simpler compounds or elements | combination reactions |
| break compounds into simpler fragments | decomposition reactions |
| making and breaking bonds within a compound | rearrangement reactions |
| involve replacement or swapping of parts within a compound | displacement reactions |
| an insoluble solid that forms when two liquids react | precipitate |
| Energy is released during the reaction, and the temperature increases | exothermic reaction |
| Energy is absorbed during the reaction and stored for later. The temperature decreases | endothermic reaction |
| two or more atoms help together by bonds | molecule |
| a notation used by scientists to show the number and type of atoms present in a molecule | chemical formula |
| a representation of a chemical element only using one or two letters | chemical symbol |
| Mass cannot be created or destroyed in ordinary chemical and physical changes. | Law of Conservation of Mass |
| photosynthesis, cooking eggs/ baking, baking soda and vinegar | examples of an endothermic reaction |
| fireworks, CaCl2+water+baking soda, elephant toothpaste | examples of an exothermic reaction |
| combination reaction | 2-1 |
| decomposition reaction | 1-2 |
| displacement | change pairs |