# Science Exam

 has a definite size & shape; particles packed together tightly; molecules move in a slow, constant motion; high melting boiling point Solid has a definite size & shape; particles more active and far apart; low melting point; lower boiling point than solid; active at room temperature Liquid no definite size or shape; fills whatever container it occupies; particles move freely & are far from each other Gases Water freezes at??????? 320 F or 00 C Water boils at???????? 2120 F or 1000 C change from a liquid to a solid state, caused by a lowered temperature Freezing solid to a liquid state, caused by raising the temperature Melting liquid to a gas state, caused when the liquid is heated Evaporation gas to a liquid, caused by a lowering of temperature Condensation solid to a gas without going through a liquid state Sublimation Electricity the energy resulting from the flow of electrons results when an object has to many or to few electrons Electric Charge have a positive charge Protons have a negative charge Electrons an electric charge build up in one place Static Electricity something that allows electricity to flow through it easily Conductor a substance that is a poor conductor of electricity Insulator a steady flow of electrons or other charged particles through a conductor Electric Current a flow of electrons in one direction such as in a battery Direct Current (DC) current that changes directions Alternating Current (AC) the difference in energy between the electrons in one place and the energy in the electrons in another place Potential Difference how hard it is to push electrons through a conductor Resistance rate at which a device changes electricity into another form Electric Power the energy used by an electrical device. The amount of energy depends on the amount of power delivered and the length of time the power is used. Electrical Energy an unbroken path formed by electrical conductors. In order to flow, a current must have and uninterrupted loop of electrical conductors. The electricity will flow from negative to positive ternminals. Circuit has only one path for the current to follow. The current is the same in every part of the circuit. If any part of the circuit is broken, the current stops. (Christmas tree lights, if one goes out they all go out) Series Circuit two or more separate branches for the current to flow. If the circuit is broken in one branch, the current will still flow to other parts of the circuit. (house electricity) Parallel Circuit a device on a circuit that can open and close the pathway to start and stop the flow of electricity (When the switch is open, there is no flow. Closed- no flow) Switch an object that attracts other magnetic materials Magnet substances that can be made into magnets by running electricity through them. To strengthen this, you can add more loops or increasing the current in the wire. Electromagnet the opposite ends of a magnet. The magnetic force is strongest at these locations. The poles are labeled north and south. Magnetic Poles the magnetic effects of a bar magnet are strongest near the.... ends sprinkling iron filings over a bar magnet shows the magnet's.... D. all of the above The area around teh magnet in which magnetic forces can be felt is called the magnetic..... field a push or pull force to pull together attract to push away repel the region around the magnet where the magnetic force acts. This region is near the poles, but extends out from the actual Magnetic FIELD Magnets that are permanate (never turn off) bar magnet Authorlexieb225 ID2455 Card SetScience Exam DescriptionMatter, Electricity, and Magnets Updated2009-12-08T02:39:12Z Show Answers