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| # | Thing | Description | Topic | For | Against | Net | |
|---|---|---|---|---|---|---|---|
| 1 | Aerosol | Suspension of fine solid particles or liquid droplets in a gas | Physical sciences | 1 | 0 | +1 | |
| 2 | Amide | Organic compounds of the form RC(=O)NR′R″ | Physical sciences | 1 | 0 | +1 | |
| 3 | Boson | Class of subatomic particle | Physical sciences | 1 | 0 | +1 | |
| 4 | Canis Major | Constellation in the southern celestial hemisphere | Physical sciences | 1 | 0 | +1 | |
| 5 | Carbon | Chemical element with atomic number 6 (C) | Physical sciences | 1 | 0 | +1 | |
| 6 | Colloid | Mixture of an insoluble substance microscopically dispersed throughout another substance | Physical sciences | 1 | 0 | +1 | |
| 7 | Electrical network | Assemblage of connected electrical elements | Physical sciences | 1 | 0 | +1 | |
| 8 | Frequency | Number of occurrences or cycles per unit time | Physical sciences | 1 | 0 | +1 | |
| 9 | Geyser | Natural explosive eruption of hot water | Physical sciences | 1 | 0 | +1 | |
| 10 | Meteorite | Solid debris from outer space that hits a planetary surface | Physical sciences | 1 | 0 | +1 | |
| 11 | Minor planet | Astronomical object that is neither a planet nor a comet | Physical sciences | 1 | 0 | +1 | |
| 12 | Nature | Material world and its phenomena | Physical sciences | 1 | 0 | +1 | |
| 13 | Neptune | Eighth planet from the Sun | Physical sciences | 1 | 0 | +1 | |
| 14 | Snow | Precipitation in the form of ice crystal flakes | Physical sciences | 1 | 0 | +1 | |
| 15 | Supercluster | Large group of smaller galaxy clusters or galaxy groups | Physical sciences | 1 | 0 | +1 | |
| 16 | Wave function | Mathematical description of quantum state | Physical sciences | 1 | 0 | +1 | |
| 17 | 3C 273 | Brightest quasar from Earth located in the constellation Virgo | Physical sciences | 0 | 0 | 0 | |
| 18 | Absolute zero | Lowest theoretical temperature | Physical sciences | 0 | 0 | 0 | |
| 19 | Absorption spectroscopy | Spectroscopic techniques that measure the absorption of radiation | Physical sciences | 0 | 0 | 0 | |
| 20 | Abyssal plain | Flat area on the deep ocean floor | Physical sciences | 0 | 0 | 0 | |
| 21 | Acceleration | Rate of change of velocity | Physical sciences | 0 | 0 | 0 | |
| 22 | Accuracy and precision | Measures of observational error | Physical sciences | 0 | 0 | 0 | |
| 23 | Acetic acid | Chemical acid found in vinegar | Physical sciences | 0 | 0 | 0 | |
| 24 | Acetone | Organic compound ((CH3)2CO); simplest ketone | Physical sciences | 0 | 0 | 0 | |
| 25 | Acid | Chemical compound giving a proton or accepting an electron pair | Physical sciences | 0 | 0 | 0 | |
| 26 | Acid rain | Rain that is unusually acidic | Physical sciences | 0 | 0 | 0 | |
| 27 | Acid–base reaction | Chemical reaction between an acid and a base | Physical sciences | 0 | 0 | 0 | |
| 28 | Acoustics | Branch of physics involving mechanical waves | Physical sciences | 0 | 0 | 0 | |
| 29 | Acre | Unit of area | Physical sciences | 0 | 0 | 0 | |
| 30 | Actinide | F-block chemical elements | Physical sciences | 0 | 0 | 0 | |
| 31 | Actinium | Chemical element with atomic number 89 (Ac) | Physical sciences | 0 | 0 | 0 | |
| 32 | Active galactic nucleus | Compact region at a galaxy's center with abnormally high luminosity | Physical sciences | 0 | 0 | 0 | |
| 33 | Aeolian processes | Processes due to wind activity | Physical sciences | 0 | 0 | 0 | |
| 34 | Aerodynamics | Branch of dynamics concerned with studying the motion of air | Physical sciences | 0 | 0 | 0 | |
| 35 | Air mass | Volume of air defined by its temperature and water vapor content | Physical sciences | 0 | 0 | 0 | |
| 36 | Albedo | Ratio of how much light is reflected back from a body | Physical sciences | 0 | 0 | 0 | |
| 37 | Alchemy | Branch of natural philosophy | Physical sciences | 0 | 0 | 0 | |
| 38 | Alcohol (chemistry) | Organic compound with at least one hydroxyl (–OH) group | Physical sciences | 0 | 0 | 0 | |
| 39 | Aldehyde | Organic compound containing the functional group R–CH=O | Physical sciences | 0 | 0 | 0 | |
| 40 | Alkali metal | Group of highly reactive chemical elements | Physical sciences | 0 | 0 | 0 | |
| 41 | Alkaline earth metal | Group of chemical elements | Physical sciences | 0 | 0 | 0 | |
| 42 | Alkane | Type of saturated hydrocarbon compound | Physical sciences | 0 | 0 | 0 | |
| 43 | Alkene | Hydrocarbon compound containing one or more C=C bonds | Physical sciences | 0 | 0 | 0 | |
| 44 | Alkyne | Hydrocarbon compound containing one or more C≡C bonds | Physical sciences | 0 | 0 | 0 | |
| 45 | Allotropy | Property of some chemical elements to exist in two or more different forms | Physical sciences | 0 | 0 | 0 | |
| 46 | Alloy | Mixture or metallic solid solution composed of two or more elements | Physical sciences | 0 | 0 | 0 | |
| 47 | Alluvial fan | Fan-shaped deposit of sediment | Physical sciences | 0 | 0 | 0 | |
| 48 | Alpha Centauri | Star system in the Centaurus constellation | Physical sciences | 0 | 0 | 0 | |
| 49 | Alpha particle | Ionizing radiation particle of two protons and two neutrons | Physical sciences | 0 | 0 | 0 | |
| 50 | Alternating current | Electric current that periodically reverses direction | Physical sciences | 0 | 0 | 0 |
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