| r.a.m. | |
| rad | |
| radiasi | |
| radiasi | |
| radiasi aktinik | |
| Radiasi Cerenkov | |
| radiasi elektromagnetik | |
| radiasi gamma | |
| radiasi infra merah | |
| radiasi keras | |
| radiasi kosmik | |
| radiasi latar belakang | |
| radiasi panas | |
| radiasi pengion | |
| radiasi sinkrotron | |
| radiasi ultraviolet | |
| radikal | |
| radioaktivitas | |
| radiofarmasi | |
| radiogenik | |
| radioimmunoassay | |
| radioisotop | |
| radiokimia | |
| radiolisis | |
| radionuklida | |
| radium | |
| radon | |
| raffinose | |
| ragi | |
| Ramsay, Sir William (1852–1916) | |
| rantai lurus | |
| rantai samping | |
| rantai terbuka | |
| rapeseed metil ester | |
| rasa | |
| rasa | |
| rasemat | |
| rasemisasi | |
| rasio fokus | |
| rasio gaya | |
| rasio gyromagnetic | |
| rasio magnetomekanis | |
| RasMol | |
| rata-rata | |
| rata-rata geometris | |
| Rayleigh, Lord (1842–1919) | |
| rayon | |
| RBS | |
| RDX | |
| reagen | |
| Reagen Millon | |
| Reagen Nessler | |
| Reagen Sanger | |
| Reagen Schiff | |
| Reagen Schweizer | |
| Reagen Tollens | |
| Reagen Van Urk | |
| reaksi | |
| reaksi berantai | |
| reaksi bergantung cahaya | |
| reaksi berosilasi | |
| reaksi fotokimia | |
| Reaksi Knoevenagel | |
| reaksi kritis | |
| Reaksi Liebermann | |
| Reaksi Mannich | |
| Reaksi Mendius | |
| reaksi orde kedua | |
| reaksi pericyclic | |
| Reaksi Sachse | |
| reaksi samping | |
| Reaksi Sandmeyer | |
| reaksi sigmatropik | |
| Reaksi Simmons-Smith | |
| Reaksi SN1 | |
| Reaksi SN2 | |
| reaksi substitusi | |
| reaksi tanpa cahaya | |
| reaksi unimolekul | |
| Reaksi Wurtz | |
| Reaksi Zeisel | |
| reaktan | |
| reaktor air mendidih | |
| reaktor berpendingin gas | |
| reaktor berpendingin gas canggih | |
| reaktor breeder | |
| reaktor cepat | |
| reaktor fusi | |
| reaktor yang dimoderasi grafit | |
| realgar | |
| redaman kritis | |
| redoks | |
| reduktor | |
| refluks | |
| refraksi ganda | |
| regioselektivitas | |
| rekayasa protein | |
| rekristalisasi | |
| relaksasi | |
| relaksasi getaran | |
| relaksasi spin-kisi | |
| rem | |
| renaturasi | |
| renium | |
| rennin | |
| reptil | |
| resin fenoksi | |
| resin fenol-formaldehida | |
| resin fenolik | |
| resin metakrilat | |
| resin urea-formaldehida | |
| resin uretan | |
| resistensi internal | |
| resolusi | |
| resonansi | |
| resonansi ganda elektron-nuklir | |
| resonansi magnetis nuklir | |
| resonansi spin-elektron | |
| resonansi tanpa ikatan | |
| resonator rongga | |
| resorsinol | |
| retak | |
| retinol | |
| retrot | |
| reverse osmosis | |
| reversibilitas mikroskopis | |
| rhe | |
| rheopexy | |
| rhodinol | |
| rhodium | |
| RIA | |
| riboflavin | |
| ribosa | |
| ribulosa | |
| ribulosa bifosfat | |
| Ricin | |
| RIS | |
| r-isomer | |
| RME | |
| RNA | |
| Roda Barlow | |
| roentgenium | |
| roh garam | |
| roh yang dimetilasi | |
| Rohypnol | |
| rontgen | |
| rontok | |
| ROSDAL | |
| rotamer | |
| rotasi optik | |
| rotaxane.dll | |
| rotor linier | |
| ruang absolut | |
| ruang antarbintang | |
| ruang antarplanet | |
| ruang awan | |
| ruang awan difusi | |
| ruang bebas | |
| ruang fase | |
| ruang gelembung | |
| Ruang Hilbert | |
| ruang ionisasi | |
| ruang konfigurasi | |
| rubi | |
| rubidium | |
| rumit | |
| rumus | |
| rumus empiris | |
| rumus proyeksi | |
| rutenium | |
| Rutherford, Ernest, Lord (1871–1937) | |
| rutherfordium | |
| rutil | |
| Rydberg konstan | |
