Terms : Hide Images
| 2800053388 | Matter | Anything that occupies space and has mass. | 0 | |
| 2800055130 | Mass | A measurement of the amount of matter an object contains. | 1 | |
| 2800056540 | Atom | The smallest particle that can contain the chemical properties of an element. | 2 | |
| 2800058250 | Element | A substance composed of atoms that cannot be broken down into smaller, simpler components. | 3 | |
| 2800060720 | Periodic table | A chart of all the chemical elements currently known, organized by their properties. | 4 | |
| 2800062516 | Molecule | A particle that contains more than one atom. | 5 | |
| 2800063231 | Compound | A molecule containing more than one element. | 6 | |
| 2800064839 | Atomic number | The number of protons in the nucleus of a particular element. | 7 | |
| 2800066706 | Isotopes | Atoms of the same element with different numbers of neutrons. | 8 | |
| 2800067953 | Radioactive decay | The spontaneous release of material from the nucleus of radioactive isotopes. | 9 | |
| 2800070617 | Half-life | The time it takes for one-half of an original radioactive parent atom to decay. | 10 | |
| 2800073137 | Covalent bond | The bond formed when elements share electrons. | 11 | |
| 2800074039 | Ionic bond | A chemical bond between two ions of opposite charges. | 12 | |
| 2800074994 | Hydrogen bond | A weak chemical bond that forms when hydrogen atoms are covalently bonded to one atom are attached to another atom on another molecule. | 13 | |
| 2800077154 | Polar molecule | A molecule in which one side is more positive and the other side is more negative. | 14 | |
| 2800078959 | Surface tension | A property of water that results from the cohesion of water molecules at the surface of a body of water and that creates a sort of skin on the water's surface. | 15 | |
| 2800081518 | Capillary action | A property of water that occurs when adhesion of water molecules to a surface is stronger than cohesion between the molecule. | 16 | |
| 2800082996 | Acid | A substance that contributes hydrogen ions to a solution. | 17 | |
| 2800084847 | Base | A substance that contributes hydroxide ions to a solution. | 18 | |
| 2800086065 | pH | The number that indicates the relative strength of acids and bases in a substance. | 19 | |
| 2800088841 | Chemical reaction | A reaction that occurs when atoms separate from molecules or recombine with other molecules. | 20 | |
| 2800090868 | Law of conservation of matter | A law of nature stating that matter cannot be created or destroyed; it can only change form. | 21 | |
| 2800093025 | Inorganic compound | A compound that does not contain the element carbon or contains carbon bound to elements other than hydrogen. | 22 | |
| 2800096700 | Organic compound | A compound that contains carbon-carbon and carbon-hydrogen bonds. | 23 | |
| 2800097826 | Carbohydrate | A compound composed of carbon, hydrogen, and oxygen atoms. | 24 | |
| 2800099208 | Protein | A critical component of living organisms made up of a long chain of nitrogen-containing organic molecules known as amino acids. | 25 | |
| 2800101710 | Nucleic acid | Organic compounds found in all living cells. | 26 | |
| 2800104233 | DNA ( deoxyribonucleic acid) | 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. | 27 | |
| 2800107528 | RNA ( ribonucleic acid) | A nucleic acid that translates the code stored in DNA, which makes possible the synthesis of proteins. | 28 | |
| 2800110344 | Lipid | A smaller organic biological molecule that does not mix with water. | 29 | |
| 2800111364 | Cell | A highly organized living entity that consists of the four types of macromolecules and other substances in a watery solution, surrounded by a membrane. | 30 | |
| 2800113528 | Energy | The ability to do work or transfer heat. | 31 | |
| 2800113943 | Joule | The amount of energy used when a 1-watt electrical device is turned on for 1 second. | 32 | |
| 2800115076 | Power | The rate at which work is done. | 33 | |
| 2800118405 | Electromagnetic radiation | A form of energy emitted by the Sun that includes, but is not limited to, visible light, ultraviolet light, and infrared energy. | 34 | |
| 2800120006 | Photon | A massless packet of energy that carries electromagnetic radiation at the speed of light. | 35 | |
| 2800122379 | Potential energy | Stored energy that has not been released. | 36 | |
| 2800122776 | Chemical energy | Potential energy stored in chemical bonds. | 37 | |
| 2800123605 | Temperature | The measure of the average kinetic energy of a substance. | 38 | |
| 2800127268 | Kinetic energy | The energy of motion. | 39 | |
| 2800128452 | 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. | 40 | |
| 2800129830 | Second law of thermodynamics | The physical law stating that when energy is transformed, the quantity of energy remains the same, but its ability to do work diminishes. | 41 | |
| 2800131700 | Energy efficiency | The ratio of the amount of energy expended in the form you want to the total amount of energy that is introduced into the system. | 42 | |
| 2800133760 | Energy quality | The ease with which an energy source cab be used for work. | 43 | |
| 2800135138 | Entropy | Randomness is a system. | 44 | |
| 2800135614 | Open system | A system in which exchanges of matter or energy occur across system boundaries. | 45 | |
| 2800136504 | Closed system | A system in which matter and energy do not occur across boundaries. | 46 | |
| 2800138722 | Input | An additional to a system. | 47 | |
| 2800139349 | Output | A loss from a system. | 48 | |
| 2800140391 | Systems analysis | An analysis to determine inputs, outputs, and changes in a system under various conditions. | 49 | |
| 2800141664 | Steady state | A state in which inputs equal outputs, so that the system is not changing over time. | 50 | |
| 2800205499 | Negative feedback loop | 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. | 51 | |
| 2800208217 | Positive feedback loop | A feedback loop in which change in a system is amplified. | 52 | |
| 2800209488 | Adaptive management plan | A plan that provides flexibility so that managers can modify it as changes occur. | 53 |
