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MR.BLOOM 6th grade

semester test

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
Created by: tr1998