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| 4800673373 | matter | -anything that occupies space and has mass made of atoms -after a chemical reaction, the original atoms remain |  | 0 |
| 4800673374 | mass | a measurement of the amount of matter an object contains |  | 1 |
| 4800673375 | atom | the smallest particle than can contain the chemical properties of an element |  | 2 |
| 4800673376 | element | -a substance composed of atoms that cannot be broken down into smaller, simpler components -made of only one type of atom |  | 3 |
| 4800673377 | periodic table | a chart of all chemical elements currently known, organized by their properties |  | 4 |
| 4800673378 | molecules | a particle that contains more than one atom |  | 5 |
| 4800673379 | compounds | a molecule containing more than one element |  | 6 |
| 4800673380 | atomic number | the number of protons in the nucleus of a particular atom |  | 7 |
| 4800673381 | mass number | a measurement of the total number of protons and neutrons in an element |  | 8 |
| 4800673382 | isotopes | atoms of the same element with different number of neutrons |  | 9 |
| 4800673383 | radioactive decay | -protons and neutrons ejected from nucleus (parent) -release energy (can damage DNA) -creates new element (daughter) -release large amounts of energy -measured in half-life -carbon dating |  | 10 |
| 4800673384 | half-life | the time it takes for one-half of an original radioactive parent atom to decay |  | 11 |
| 4800673385 | covalent bond | the bond formed when elements share electrons |  | 12 |
| 4800673386 | ionic bond | a chemical bond between two oppositely charged ions |  | 13 |
| 4800673387 | hydrogen bond | -when electrons are not shared equally in a compound that contains Hydrogen -can attract anything negatively charged |  | 14 |
| 4800673388 | polar molecule | -a molecule in which one side is more positive and the other side is more negative -shared electrons spend more time near the oxygen atom than near the hydrogen atom | 15 | |
| 4800673389 | energy | -the ability to do work or transfer heat -measured in joules (J) -electromagnetic radiation -high or low quality |  | 16 |
| 4800673390 | electromagnetic radiation | -transfers energy in protons -measured in wavelengths |  | 17 |
| 4800673391 | photons | a massless packet of energy that carries electromagnetic radiation at the speed of light |  | 18 |
| 4800673392 | joule | the amount of energy used when a one-watt electrical device is turned on for one second |  | 19 |
| 4800673393 | potential energy | stored energy that has not been released |  | 20 |
| 4800673394 | kinetic energy | the energy of motion |  | 21 |
| 4800673395 | chemical energy | -potential energy that is stored in chemical bonds -can be released by ingesting food |  | 22 |
| 4800673396 | temperature | -the measure of the average kinetic energy of a substance | 23 | |
| 4800673397 | first law of thermodynamics | -a law of nature stating that energy can neither be created nor destroyed |  | 24 |
| 4800673398 | second law of thermodynamics | -the law stating that when energy is transformed, the quantity of energy remains the same, but its ability to do work is diminished |  | 25 |
| 4800673399 | energy efficiency | -the ratio of the amount of work done to the total amount of energy introduced to the system |  | 26 |
| 4800673400 | energy quality | -the ease with which an energy source can be used for work | 27 | |
| 4800673401 | entropy | -disorder/randomness in a system |  | 28 |
| 4800673402 | open system | -a system in which exchanges of matter or energy occur across system boundaries. | 29 | |
| 4800673403 | closed system | -exchange of matter or energy does not occur across system boundaries. Ex: Matter on Earth continuously recycles | 30 | |
| 4800673404 | outputs | -a loss from a system | 31 | |
| 4800673405 | inputs | -an addition to a system | 32 | |
| 4800673406 | system analysis | -looks at inputs and outputs to determine a system's function and health | 33 | |
| 4800673407 | steady state | -input = output -amount of energy is not increasing |  | 34 |
| 4800673408 | feedback | -adjustment to input or output caused by change |  | 35 |
| 4800673409 | negative feedback loops | -a feedback loop in which a system responds to a change by returning to its original state, or by decreasing the rate at which the change is occurring |  | 36 |
| 4800673410 | positive feedback loops | a feedback loop in which change in a system is amplified |  | 37 |
| 4800673411 | adaptive management | -method of managing natural systems that accords for "normal" fluctuations and human impacts -pollution, flood, draught, climate change, economic development, habitat destruction or restoration | 38 | |
| 4800673412 | weight | the force that results from gravity acting on mass | 39 | |
| 4800673413 | Properties of Water | -surface tension -capillary action -high specific heat -less dense when frozen -excellent solvent -can form acids and bases | 40 | |
| 4800673414 | Surface Tension | -cohesion of water molecules creates stretchy surface layer | 41 | |
| 4800673415 | Capillary Action | -cohesion and adhesion of water molecules pulls them along a surface or up a tube | 42 | |
| 4800673416 | Less dense when frozen | -polarity pushes water molecules apart at 39F and 4C | 43 | |
| 4800673417 | High Specific Heat | -requires a large amount of heat to boil and vaporize water | 44 | |
| 4800673418 | Excellent Solvent | -polar molecule can dissolve other compounds with charges | 45 | |
| 4800673419 | Can form acids and bases | -acids add hydrogen ions (high hydrogen ion H+, low hydroxide ion (OH-) content -bases add hydroxide ions (low hydroxide ion OH-, high hydrogen ion H+ | 46 | |
| 4800673420 | Conservation of Matter | -matter cannot be created or destroyed, only changed from one form to another | 47 | |
| 4800673421 | Organic Molecules | -contain carbon and hydrogen -carbohydrates (CHO) -lipids (CHO with little O; fats, waxes, oils) -proteins (CHONS,amino acids) -nucleic acids (CHONP, DNA and RNA) | 48 | |
| 4800673422 | Inorganic Molecules | -can contain Carbon and Hydrogen just NOT together | 49 | |
| 4800673423 | Power | -rate at which work is done -energy= power x time -kilowatts (kW) | 50 | |
| 4800673424 | Kinetic Energy | -energy in option or use | 51 | |
| 4800673425 | Potential Energy | -stored energy -chemical energy | 52 | |
| 4800673426 | Law of Thermodynamics | -1st Law: energy cannot be created or destroyed, only changed from one form to another -2nd Law: when energy is changed, it releases "useless" or waste energy in the form of electromagnetic radiation (heat, light...) | 53 | |
| 4800673427 | Energy Efficiency | -waste energy is lost at each conversion -more energy = more efficiency | 54 | |
| 4800673428 | Open System | -exchange of matter or energy occur across system boundaries | 55 | |
| 4800673429 | Negative Feedback Loop | -accelerates change -stimulus -system becomes skewed in one direction | 56 | |
| 4800673430 | natural law | -phenomenon which has been rigorously tested and to which there are no known exceptions | 57 | |
| 4800673431 | amount of energy needed to change the temperature of water | -is great in relation to the energy required to change the temperature of most other substances -is responsible for more moderate seasonal temperature swings in areas close to large bodies of water | 58 | |
| 4800673432 | Macromolecules | -carbohydrates, proteins, lipids, nucleic acids | 59 | |
| 4800673433 | Bases contribute _______ to a solution | -negative Hydroxide ions | 60 | |
| 4800673434 | Positive Feedback Loop | -when feedback into a system increases a rate of response -may be seen in some examples of population growth | 61 | |
| 4800673435 | Natural experiment | -natural event changes an ecosystem | 62 |
