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MR.BLOOM 6th grade
semester test
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 |