| Question | Answer |
| black box | anything that represents something that we cannot easily open or see. |
| model | represation or explanation of something that shows how it looks or works. |
| siphon | tube that moves liquid by gravity. |
| **conceptual model | math,words,or drawings to explain how something works or is built |
| **physical model | real model that can be tested |
| collaborate | working together |
| consensus | everyone agrees |
| circuit | unbroken pathway that elect flows through |
| switch | device that opens/closes a circuit |
| axle | rod connecting wheels |
| bearing | device that allows the axle to turn |
| hub | the central part of a circular object (wheel or propeller) |
| wheel | disk that turns around a central axis |
| traction | friction between wheels and surface |
| friction | force that resists motion |
| design | the process of figuring out how to make something |
| engineer | people who design things |
| identify the steps to the scientific method | (pheoc)problem,hypothesis,evaluate,observation,conclusion |
| what is the difference between building a model and a design in engineering?? | model-representing somethingdesign-proving or building a product |
| conduction | flow of heat by direct contact |
| coductor | energy travels easily through |
| contract | to take up less space;to get smaller |
| covection | flow of heat when a liquid or gas moves from one place to another |
| expand | to take up more space;to get larger |
| heat | flow of energy from warmer matter to cooler matter |
| insulator | a substance that slows down the transfer of heat |
| radiation | flow of heat without matter |
| temperature | a measurement of the aveage motion of the particles in a substance or object |
| thermal energy | total energy of the particles that make up matter |
| molecule | atoms combined together |
| atom | smallest unit in matter |
| proton | positive charge |
| nuetron | no charge |
| electron | negative charge |
| nucleus | protons and nuetrons |
| what happens to molecules when heated?? | they start to move very fast.they start bouncing off of each other. |
| what happens when matter is heated or cooled?? | heated-matter will expandcooled-matter will contract |
| synthesis | substances combine (*+. -> *.) |
| decomposition | substance breaks apart ( *. -> * + . |
| single replacement | one element replaces another (*. + @ -> *. + @ ) |
| double replacement | substances switch places (*. + @& -> *@ + *.) |
| acid | a compound that releases hydrogen ions in water |
| base | a compound that releases hydroxixide ions when dissolved in water |
| chemical equation | an arrangement of symbols and formulas used to show what happens during a chemical equation |
| concentrated | a lot od silute compared to amount of solvent (strong) |
| dilute | little solute comparede to the amount of solvent (weak) |
| endothermic reaction | a chemical reaction in which moore energy is taken in than is given off |
| evaporation | the change of state from liquid to gas at the surface of a liquid |
| exothermic reaction | a chemical reaction in which more energy is given off than is taken in |
| formula | arrangement of symbols that shows both the kinds and numbers of atoms in a compound |
| indicator | a substance that changes color at a certain range of plt values |
| nuetralization | a process in which an acid a base react to produce salt and water |
| pH scale | a set of nubers between zero and 14 used to measure the strength of acids and bases |
| product | a substance that is formed in a chemical reaction |
| reactant | a substance that undergoes a chemical reaction often by combining with another substance |
| solute | a substance that is dissolved |
| solvent | a substance that dissolves other materials |
