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| 7269425893 | matter | anything that occupies space and has mass |  | 0 |
| 7269425894 | mass | a measurement of the amount of matter an object contains |  | 1 |
| 7269425895 | atom | the smallest particle than can contain the chemical properties of an element |  | 2 |
| 7269425896 | element | a substance composed of atoms that cannot be broken down into smaller, simpler components |  | 3 |
| 7269425897 | periodic table | a chart of all chemical elements currently known, organized by their properties |  | 4 |
| 7269425898 | molecule | a particle that contains more than one atom |  | 5 |
| 7269425899 | compound | a molecule containing more than one element |  | 6 |
| 7269425900 | atomic number | the number of protons in the nucleus of a particular atom |  | 7 |
| 7269425901 | mass number | a measurement of the total number of protons and neutrons in an element |  | 8 |
| 7269425902 | isotopes | atoms of the same element with different number of neutrons |  | 9 |
| 7269425903 | radioactive decay | the spontaneous release of material from the nucleus of radioactive isotopes |  | 10 |
| 7269425904 | half-life | the time it takes for one-half of an original radioactive parent atom to decay |  | 11 |
| 7269425905 | covalent bond | the bond formed when elements share electrons |  | 12 |
| 7269425906 | ionic bond | a chemical bond between two oppositely charged ions |  | 13 |
| 7269425907 | hydrogen bond | a weak chemical bond that forms when hydrogen atoms that are covalently bonded to one atom are attracted to another atom or another molecule |  | 14 |
| 7269425908 | polar molecule | a molecule in which one side is more positive and the other side is more negative | 15 | |
| 7269425909 | energy | the ability to do work or transfer heat |  | 16 |
| 7269425910 | electromagnetic radiation | a form of energy emitted by the sun that includes but is not limited to, visible light, ultraviolet light, and infrared energy |  | 17 |
| 7269425911 | photon | a massless packet of energy that carries electromagnetic radiation at the speed of light |  | 18 |
| 7269425912 | joule | the amount of energy used when a one-watt electrical device is turned on for one second |  | 19 |
| 7269425913 | potential energy | stored energy that has not been released |  | 20 |
| 7269425914 | kinetic energy | the energy of motion |  | 21 |
| 7269425915 | chemical energy | potential energy that is stored in chemical bonds |  | 22 |
| 7269425916 | temperature | the measure of the average kinetic energy of a substance | 23 | |
| 7269425917 | first law of thermodynamics | a physical law which states that energy can neither be created nor destroyed but can change from one form to another |  | 24 |
| 7269425918 | second law of thermodynamics | a physical law stating that when energy is transformed, the quantity of energy remains the same, but its ability to do work is diminished |  | 25 |
| 7269425919 | energy efficiency | the ratio of the amount of work done to the total amount of energy introduced to the system |  | 26 |
| 7269425920 | energy quality | the ease with which an energy source can be used for work | 27 | |
| 7269425921 | entropy | disorder/randomness in a system |  | 28 |
| 7269425922 | open system | a system in which exchanges of matter or energy occur across system boundaries. | 29 | |
| 7269425923 | closed system | exchange of matter or energy does not occur across system boundaries. Ex: Matter on Earth continuously recycles | 30 | |
| 7269425924 | output | a loss from a system | 31 | |
| 7269425925 | input | an addition to a system | 32 | |
| 7269425926 | system analysis | looks at inputs, outputs, and changes in a system under various conditions | 33 | |
| 7269425927 | steady state | a state in which inputs equal outputs, so that the system is not changing over time |  | 34 |
| 7269425928 | feedback | adjustment to input or output caused by change |  | 35 |
| 7269425929 | 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 |
| 7269425930 | positive feedback loops | a feedback loop in which change in a system is amplified |  | 37 |
| 7269425932 | weight | the force that results from gravity acting on mass | 38 | |
| 7269425934 | surface tension | cohesion of water molecules creates stretchy surface layer | 39 | |
| 7269425935 | capillary action | cohesion and adhesion of water molecules pulls them along a surface or up a tube | 40 | |
| 7269425940 | conservation of matter | matter cannot be created or destroyed, only changed from one form to another | 41 | |
| 7269425941 | organic compound | a compound that contains carbon-carbon and carbon-hydrogen bonds | 42 | |
| 7269425942 | inorganic molecules | a compound that does not contain the element carbon or contains carbon bound to elements other than hydroget | 43 | |
| 7269425943 | power | rate at which work is done | 44 | |
| 7269425944 | kinetic energy | the energy of motion | 45 | |
| 7269425945 | potential energy | stored energy that has not been released | 46 | |
| 7269425947 | energy efficiency | the ratio of the amount of energy expended in the four you want to the total amount of energy that is included in the system | 47 | |
| 7269425948 | open System | exchange of matter or energy occur across system boundaries | 48 | |
| 7269425950 | natural law | phenomenon which has been rigorously tested and to which there are no known exceptions | 49 | |
| 7269425952 | macromolecules | carbohydrates, proteins, lipids, nucleic acids | 50 | |
| 7275789033 | acid | a substance that contributes hydrogen ions to a solution | 51 | |
| 7275874340 | base | a substance that contributes hydroxide ions to a solution | 52 | |
| 7275878480 | pH | the number that indicates the relative strength of acids and bases in a substance | 53 | |
| 7275978426 | chemical reaction | a reaction that occurs when atoms separate from molecules or recombine with other molecules | 54 | |
| 7275982463 | carbohydrate | a compound composed of carbon, hydrogen, and oxygen atoms | 55 | |
| 7275993492 | protein | a critical component of living organisms made up of a long chain of nitrogen-containing organic molecules known as amino acids |  | 56 |
| 7276014804 | nucleic acid | organic compounds found in all living cells | 57 | |
| 7276019120 | DNA | a nucleic acid, the genetic material that contains the code for reproducing the components of the next generation, and which organisms pass on to their offspring |  | 58 |
| 7276026518 | RNA | a nucleic acid that translates the code stored in DNA, which makes possible the synthesis of proteins | 59 | |
| 7276032602 | lipid | a smaller organic biological molecule that does not mix with water | 60 | |
| 7276035005 | cell | a highly organized living entity that consists of four types of macromolecules and other substances in a water solution, surrounded by a membrane | 61 |
