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PS Semester II
| Question | Answer |
|---|---|
| Fossil Fuels | fuels that are formed from decaying remains of ancient plants and animals |
| Nonrenewable Resources | fuels that cannot be replaced by natural process as quickly as they are being used |
| Renewable Resources | fuels that can be replaced as quickly as they are used |
| Nuclear Reactor | where nuclear reactions happen |
| Nuclear Fission | splitting U-235 nuclei to produce energy |
| Hydroelectricity | produced by moving water |
| Tidal Energy | produced by waves |
| Wind Energy | produced by wind |
| Geothermal Energy | contained in magma |
| Biomass | renewable organic material that can be used to produce energy |
| Wave | disturbance that carries energy |
| Medium | material through which a wave travels |
| Transverse Wave | the medium moves at right angles to the direction the wave is traveling |
| Compressional Wave | mater vibrates in the same direction as the wave |
| Crest | the top part of a wave |
| Trough | the bottom part of a wave |
| Amplitude | amount of energy carried by a wave |
| Wavelength | distance between wavelength |
| Frequency | number of waves passed by per a second |
| Fm | frequency modulation |
| Am | amplitude modulation |
| Plane Mirror | mirror with a flat surface |
| Convex Mirror | mirror curves outwards |
| Convex Lens | lens is thicker in the middle thin at edges |
| Concave Mirror | mirror curves in |
| Concave Lens | thinner in the middle thicker at the edges |
| Substance | definite composition |
| Element | one kind of atom |
| Compound | two or more |
| Mixture | variable composition |
| Homogeneous Mixture | evenly spread out |
| Heterogeneous Mixture | unevenly mixed |
| Solution | largest particles, unevenly spread out, particles settle |
| Colloid | never settles, largest particles, scatters light |
| Chemical Bond | force that holds atoms together in a compound |
| Ionic Bond | electrons are transferred creating opposite charges which attract |
| Ion | an atom that has gained or lost and electron |
| Covalent Bond | force of attraction between atoms in a molecule that share electrons |
| Polar Molecule | electrons shared unevenly |
| Nonpolar Molecule | electrons shared unevenly |
| Toxic | poisonous |
| Corrosive | "to tear up" |
| Volatile | evaporates easily |
| Binary Compound | composed of two elements |
| Hydrate | ionic compound that has water chemically attached to ti's ions |
| Period | T-inverse of frequency |
| Resonance | vibrations that build when objects are forced to vibrate at their natural frequencies |
| Pitch | human perception of sound frequency based on frequency highness or lowness of sound |
| Loudness | human perception of loudness of sound |
| Sonar | sound navigation and ranging |
| Music | a regular pattern formed by using specific pitches and sound quality |
| Noise | no set pattern or pitch |
| Overtones | multiples of the frequency |
| Cogulation | process of destroying the colloid structure of pollution particles |
| Physical Property | characteristics of a material that you can observe without changing the material itself |
| Physical Change | change in appearance without a change in identity |
| Chemical Property | characteristics of a material that tells if it can go over certain chemical changes |
| Chemical Change | a change of one substance into a different substance |
| Combustion | a synthesis reaction in which a substance reacts with oxygen to produce energy in the form of heat and light |
| Decomposition | one substance breaks down into two or more |
| Single Displacement Reaction | one element replaces another compound |
| Precipitate | a solid that is formed in a reaction |
| Catalyst | substance that speeds up a chemical reaction without itself being always charged |
| Enzyme | a catalyst in the body which makes body reactions go quickly |
| Inhibitor | substances which prevent reactions |
| Plasma | gas-like mixture of charged particles |
| Pressure | force spread out over an area |
| Isotope | same element with a different number of nuetrons |
| Reflection | waves striking an object and bouncing off |
| Refraction | bending of waves caused by a change in speed when moving from one medium to another |
| Alloy | solid solution |
| Solute | substances being dissolved |
| Solvent | substances that dissolves the solute |
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