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| # | Thing | Description | Topic | For | Against | Net | |
|---|---|---|---|---|---|---|---|
| 151 |  | Calcium carbonate | Chemical compound | Physical sciences | 0 | 0 | 0 |
| 152 |  | Calcium chloride | Chemical compound | Physical sciences | 0 | 0 | 0 |
| 153 |  | Californium | Chemical element with atomic number 98 (Cf) | Physical sciences | 0 | 0 | 0 |
| 154 |  | Callisto (moon) | Second-largest moon of Jupiter | Physical sciences | 0 | 0 | 0 |
| 155 |  | Calorie | Unit of energy used in nutrition | Physical sciences | 0 | 0 | 0 |
| 156 |  | Cambrian | First geological period of the Paleozoic Era | Physical sciences | 0 | 0 | 0 |
| 157 | Cambrian explosion | Period of major evolutionary diversification of animal life | Physical sciences | 0 | 0 | 0 | |
| 158 |  | Candela | SI unit of luminous intensity | Physical sciences | 0 | 0 | 0 |
| 159 |  | Canopus | Brightest star in the constellation of Carina | Physical sciences | 0 | 0 | 0 |
| 160 |  | Canyon | Deep chasm between cliffs | Physical sciences | 0 | 0 | 0 |
| 161 |  | Capacitance | Ability of a body to store an electrical charge | Physical sciences | 0 | 0 | 0 |
| 162 |  | Capella | Brightest star in the constellation Auriga | Physical sciences | 0 | 0 | 0 |
| 163 |  | Carbon dioxide | Carbon-oxygen gas | Physical sciences | 0 | 0 | 0 |
| 164 |  | Carbon monoxide | Poisonous gas consisting of carbon and oxygen | Physical sciences | 0 | 0 | 0 |
| 165 |  | Carbon nanotube | Allotropes of carbon with a cylindrical nanostructure | Physical sciences | 0 | 0 | 0 |
| 166 |  | Carbonate | Salt or ester of carbonic acid | Physical sciences | 0 | 0 | 0 |
| 167 |  | Carboxylic acid | Organic compound containing a –C(=O)OH group | Physical sciences | 0 | 0 | 0 |
| 168 |  | Carina Nebula | Interstellar clouds in the constellation Carina | Physical sciences | 0 | 0 | 0 |
| 169 |  | Cassiopeia (constellation) | Constellation in the northern celestial hemisphere | Physical sciences | 0 | 0 | 0 |
| 170 |  | Cast iron | Iron-carbon alloy | Physical sciences | 0 | 0 | 0 |
| 171 |  | Catalysis | Process of increasing the rate of a chemical reaction | Physical sciences | 0 | 0 | 0 |
| 172 |  | Cave | Natural void under a planetary surface | Physical sciences | 0 | 0 | 0 |
| 173 | Celestial mechanics | Branch of astronomy | Physical sciences | 0 | 0 | 0 | |
| 174 |  | Celestial sphere | Conceptual tool in astronomy | Physical sciences | 0 | 0 | 0 |
| 175 |  | Celsius | Unit of measurement for temperature | Physical sciences | 0 | 0 | 0 |
| 176 |  | Cenozoic | Third and current era of the Phanerozoic Eon | Physical sciences | 0 | 0 | 0 |
| 177 |  | Centaurus | Constellation in the southern celestial hemisphere | Physical sciences | 0 | 0 | 0 |
| 178 |  | Centaurus A | Radio galaxy in the constellation Centaurus | Physical sciences | 0 | 0 | 0 |
| 179 |  | Centripetal force | Force directed to the center of rotation | Physical sciences | 0 | 0 | 0 |
| 180 |  | Cepheid variable | Type of variable star that pulsates radially | Physical sciences | 0 | 0 | 0 |
| 181 |  | Ceres (dwarf planet) | Dwarf planet in the asteroid belt | Physical sciences | 0 | 0 | 0 |
| 182 |  | Cerium | Chemical element with atomic number 58 (Ce) | Physical sciences | 0 | 0 | 0 |
| 183 |  | Chemical bond | Association of atoms to form chemical compounds | Physical sciences | 0 | 0 | 0 |
| 184 |  | Chemical compound | Substance composed of multiple chemically bonded elements | Physical sciences | 0 | 0 | 0 |
| 185 |  | Chemical element | Chemical substance not composed of simpler ones | Physical sciences | 0 | 0 | 0 |
| 186 | Chemical equation | Symbolic representation of a chemical reaction | Physical sciences | 0 | 0 | 0 | |
| 187 | Chemical equilibrium | When the ratio of reactants to products of a chemical reaction is constant with time | Physical sciences | 0 | 0 | 0 | |
| 188 | Chemical formula | Compact notation for chemical compounds | Physical sciences | 0 | 0 | 0 | |
| 189 |  | Chemical kinetics | Study of the rates of chemical reactions | Physical sciences | 0 | 0 | 0 |
| 190 |  | Chemical reaction | Process that leads to chemical changes | Physical sciences | 0 | 0 | 0 |
| 191 | Chemical synthesis | Planned series of chemical reactions to produce desired product(s) | Physical sciences | 0 | 0 | 0 | |
| 192 |  | Chemistry | Scientific study of matter's behavior and properties | Physical sciences | 0 | 0 | 0 |
| 193 | Chloride | Main anion present in sea water | Physical sciences | 0 | 0 | 0 | |
| 194 |  | Chlorine | Chemical element with atomic number 17 (Cl) | Physical sciences | 0 | 0 | 0 |
| 195 | Chromatography | Set of laboratory techniques for separation of mixtures | Physical sciences | 0 | 0 | 0 | |
| 196 |  | Chromium | Chemical element with atomic number 24 (Cr) | Physical sciences | 0 | 0 | 0 |
| 197 |  | Chronology of the universe | History and future of the universe | Physical sciences | 0 | 0 | 0 |
| 198 |  | Cirrus cloud | Genus of atmospheric cloud | Physical sciences | 0 | 0 | 0 |
| 199 |  | Citric acid | Weak organic acid | Physical sciences | 0 | 0 | 0 |
| 200 |  | Classical mechanics | Description of large objects' physics | Physical sciences | 0 | 0 | 0 |
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