You start in Medbay. You mess with all sorts of chemicals. That's it. Some of the time you can do what ever you feel like for most of the round or make stuff to deal with the security officers or syndicate fucking with shit in your lab. Be sure to keep the scientists stocked with acid, and keep your nose out of those space drugs!
Bare minimum requirements: Stock the dispenser up with some beneficial medicine before you go off on your own chemical adventures. Give botanists unstable mutagen when they ask for it, and don't give the clown lube!
Getting Things Done
Chemists are naturally suspicious individuals. They've got all the tools in the world to break in wherever they desire and/or kill people in all sorts of horrifying and inhumane ways. An easy way to allay this suspicion - whether you plan on doing something suspicious or not - is to make yourself useful to the station at the game's beginning. Any accidents are likely to be blamed on your coworker, then, if you have one.
Tools of the trade
The Chem Dispenser turns electrical energy into a variety of basic chemicals, through magic science. Guard it with your life. If you run out of power, you can disassemble the dispenser with screwdriver+crowbar and rebuild it by first putting the circuit board back, and then all other things but use a full power cell 
instead of the old one. Then screwdriver to finish (or ask Science for upgrades). Or you can charge the machine with an inducer 
.
The plumbing system can help you automate the creation of chemicals. Click here for more information.
The ChemMaster 3000 can magically separate chemicals, and has the ability to produce a limitless supply of 50 unit pills, 40 unit patches and 30 unit bottles.
The Reagent Grinder is identical to the grinder the Chef has. It can be used to extract chemical reagents from things the Shaft Miners, Chef, and Botanists produce.
The Chemical Heater is important for making many recipes that require high temperatures to mix.
Inside the chemistry locker you will find boxes of pill bottles on some maps. These can be loaded with pills for inventory space efficiency. 
Some maps also have medical sprays in the same locker. These can be filled with chemicals by using the ChemMaster. They work as patches and provide an optional way to apply medicine.
On a table is a hand labeler. This can be used to label beakers, pill bottles, grenades and many other things. Actual pills and patches are instead labeled with the ChemMaster.
Being helpful
These are some suggested things you can make. Just remember you can't be certain that these things will actually be used, so if you wish you can choose hold off on most things until you receive requests. Also, if you are using a map with the plumbing system instead of a chem dispenser you may want to focus on mass producing a select few things instead of a bit of everything.
You can find a list of most of the reagents in the game here.
Roundstart
If someone comes and requests something from you, make sure you fulfill them first. No one likes a chemist doing his own thing as they have to stand there waiting. If you are in the middle of something, inform them that you will be right with them. These suggestions were written with an available chem dispenser in mind.
- For yourself:
- Make plastic sheets, then use them to craft large water bottles. These are functionally identical to large beakers!
- Bring a few plastic sheets to the medical techfab, and you should be able to print a few 120u XL-beakers.
- Print a chemistry bag from your ChemDrobe. You will use it to put pills/patches/bottles in either a fridge, a pile somewhere (click-drag bag to floor) or to just carry them around. It's your choice.
- Optionally, grab a syringe gun, vend a couple of syringes from a NanoMed Plus
and make a chemical for self-defense to fill them with, such as Chloral Hydrate. You do not have to do this. Also see Arming thyself.
- Suggested basic chems (in order of urgency):
- 30u unstable mutagen bottles for the Botanist (if asked to).
- 30u mannitol bottles. Bottles let people use them both to heal their brain damage and to pour on damaged brains.
- 40u potassium iodide pills. Heals minor radiation.
- Suggested intermediate chems:
- 40u synthflesh patches. Heals both brute and burn even on corpses, but deals toxin damage. If you want to mass produce something, this is a good choice.
- 10u neurine pills. This heals basic traumas.
- 5u oculine pills. Heals eyes.
- 5u Inacusiate pills. Heals ears.
- 0.5u mutadone pills. Instantly removes mutations.
- 60u libital medical gel (there's empty gel cans in the chemistry locker.) Heals brute.
- 60u aiuri medical gel. Heals burn.
- 20u syriniver + 80u anything else in Intravenous Medicine Bags. Heals toxins.
- Suggested advanced chems:
- 10u pentetic acid pills. Heals toxins, major radiation and purges all chemicals quickly.
- 30u salbutamol pills. Heals oxyloss safely and lets you survive without air.
- 10u atropine patches. Quickly heals someone who is in crit.
- 10u lipolicide pills. To make fat people slim.
Other things you may want to do
- During a disease outbreak, if the cure is something you can produce, then make pills of it. Curing can take a random time, so aim for pills at least 5u big. If the virologist comes in with a vaccine, then make 0.1u vaccine pills instead. Read more about common cures under here. You can also make the vaccine yourself at the holodeck Emergency Medical program, if you have time.
- You can go over to cargo and use the public console to receive a bounty to make.
- Botany can use saltpetre to quickly optimize plant stats, diethylamine/ammonia as fertilizers and a dropper for precise mutations.
- Xenobiology can use radium to make various mutation toxins.
- The Virologist sometimes wants more synaptizine to make new and exciting diseases.
- Geneticists might benefit from a supply of potassium iodide or to treat radiation levels in themselves and their subjects. Genetic scanners no longer irradiate the monkeys, but the Radioactive mutation can if it's disabled too late.
- The Janitor might want you to refill his space cleaner bottle or to have some drying agent for their galoshes (few know about it, and it's easy to make, so you may even offer).
- You can help the Chef replenish the supply of sugar.
- The Bartender might request various chemicals to make cocktails with, though bear in mind that a bartender who wants anything particularly toxic is probably up to no good.
- The Warden might request various chemicals to use in implants for prisoners, to ensure they don't re-offend.
- Grind up snacks or fail making Sodium Chloride to make nutriment or vitamin pills and taunt the Chef about his inefficient creations.
- In the event of a rogue Hulk from genetics rampaging about, a syringe gun loaded with a syringe containing 1 unit mutadone and 14 units chloral hydrate/lexorin will make them very sad.
- In the case of a rogue AI, various people will want thermite in order to break through reinforced walls.
- Rogue AIs in particular go down with a combination of thermite and EMP grenades.
- Enable the reagent scanner on your PDA and test the food and drinks at the bar and kitchen for tampering. This can also be used on people to find out what they've been poisoned with.
- You aren't far from the Medbay lobby or the cryogenics, so if there are no Medical Doctors around, feel free to grab a health analyzer and start treating patients.
- The Clown will often request space lube. When this happens, you have choice. The recommended choice is to NOT give lube to the clown. Barbers Aid can be used as a prank worthy substitute.
- cooperate with the Botanist to make a factory that makes Condensed Capsaicin, Security Officers will love it.
Arming thyself
- Grab one of the syringe guns in Medbay before the Medical Doctors get them. It's a valuable weapon in your hands when filled with Chloral Hydrate or worse.
- Later in the round, if you've been nice to R&D, and they are competent, they might research "Medical Weaponry", which lets you print a rapid syringe gun from the medical techfab. This can hold six syringes at once.
- A space cleaner spray bottle can be used as a ghetto flamethrower with chlorine trifluoride that makes 3x3 fireballs with you at its center (prepare firefighting gear).
- You have all the tools you need to make grenades.
Grenades
As a chemist you have the tools you need to craft chemical grenades. See the grenade guide to learn how to make them. These can be both beneficial and malicious, depending on what chems you put into the two beakers. When the grenade is triggered the two beakers will mix. Typically you want the grenade to result in either smoke or foam containing other chemicals. To learn the differences between smoke and foam, see Smoke vs foam vs others.
Pills and Patches
Pills are a great way to give large amount of medicine at once, if you are going to make medicine that will be single serve, make it pill form. Each pill can hold 50 units of material at one time, and up to seven can be stored in a pill bottle! They are even small enough to store in your pockets. Patches are similar to pills, but work in a touch-based way rather than ingestion. Read more about the different ways of applying chemicals under Reagent Delivery.
Chemo-spherics
These projects can be dangerous, so be sure to have the approval of the Chief Medical Officer. Some chemicals can release gas if spilled or released in smoke. If in a past life you were an Atmospheric Technician, you can create a gas factory with plumbing. Combining 9:1 Phlogiston and oxygen smoke/foam will net you a never-ending plasma fire. If safely contained, this can produce Water Vapor and possibly Tritium. Mixing Nitrous Oxide smoke with Phlogiston's plasma fires can make BZ. Producing, harvesting, and selling Nitrous Oxide gas to cargo can be very profitable.
Tips
- If there are no chemistry bags available, you can use wirecutters
on two bedsheets, activate the resulting cloth in your hand and craft one. - The effects of chloral hydrate don't work if you drink coffee beforehand. You'll still take damage if the dose was high enough but you don't get knocked out.
- The effects of different chemicals stack, as they are all processed individually at the same time.
- Foam and smoke carry reagents. Foam will continuously apply the reagent's vapor effect, while smoke will cause touch effects and repeated ingestion. One can release a synthflesh smoke grenade to heal someone from critical to full health almost instantly, or use a fluorosulfuric acid smoke grenade to make everyone's stuff start melting and deal absolutely decent amounts of damage.
- Grenades are great for everything. Experiment!
- If you go to the chef or break room at round start and grab a heated donk pocket, and then to the chaplain for some holy water (bring a beaker), you now have the stuff to make Strange Reagent, which can literally bring people back from the dead. Laugh at the geneticists as they space themselves after becoming effectively useless. Also, this strange reagent can be diluted with other reagents. It only requires 0.4u of strange reagent to revive someone.
- Strange Reagent can only revive someone with less than 100 brute and 100 burn damage. This does not stack; 99 brute and 99 burn means they can still be revived.
- You don't need a grenade for foam. You can have fluorosurfactant in a beaker and a bottle of equal water. Combine the two to produce grenade-less foam.
- Medbay lobby looking like a chainsaw massacre? Let loose some space cleaner foam and watch as medical bay is magically cleaned and the janitor infuriated.
Tips for Antagonizing
- Some chemicals deal absolutely amazing damage. If you fill a spray bottle with chlorine trifluoride, you will literally spray fire.
- You can put pretty much put any deadly chemical into patches. Make some fluorosulfuric acid patches labeled "Synthflesh," or put some chlorine trifluoride and phlogiston into a patch and anyone who uses it will be lit on fire instantly with no way of putting themselves out without an extinguisher or space.
- Sulfonal is chloral hydrate, but needs more preparation, takes longer to act, and takes WAY longer to stop acting. Put sulfonal and cyanide into a beaker in equal parts, and you have a kill mix that gives someone about 45 seconds of awake time before they drop and don't get back up, provided you drag them to a safe place to die.
- If you're a traitor, you can pray to trade your telecrystals for a chem sprayer. If the admins are
absolutely fucking insanenice, they'll give you a tool which can hold 300 units of any chemical. You can start cackling now. - Make a foam grenade with fluorosulfuric, chlorine trifluoride, space lube, and phlogiston. You now have a server-lagging, hull-breach causing, people-obliterating grenade full of liquid holocaust. Drop it behind you during a security chase and laugh as your pursuers fall into it and have their gear melted away before dying instantly from the acid.
- Some of the Bartender's drinks are very powerful. If you combine the Pan-Galactic Gargle Blaster with morphine, it will give you Neurotoxin, which will mess up anyone hit with it.
- If you emag a service borg, they can produce infinite amounts of "beer" that will put someone to sleep when they ingest it.
- If you can somehow get lethal syringes from Security, they hold fifty units and fit in syringe guns. You can have much more powerful deathmixes if you use one of these, but try not to miss as they cannot be replaced!
- If researched, you can print piercing syringes from the medical techfab. These can hold 10u and will penetrate hardsuits.
- Later you can print bluespace syringes from the medical techfab, which can hold 60u. These cannot be put into syringe guns, however.
- Do not underestimate the power of foam. Even with no reagents, it can provide a barrier and prevent people from getting by without slipping.
- "Accidentally" leave some fluorosulfuric acid in the cryo tubes. Unattentive doctors will just flick it on and walk away as the patient dies screaming. Expect to be lynched, however.
- You can make drugs like methamphetamine to move very fast and have stun reduction in combat, but only take small amounts.
- Traitors can buy a poison kit. This box contains ten bottles of horrible poisons that are also very effective in killing people.
- Sleepy pens can be refilled with 45u of any chemicals and inject instantly with only a small notification. You can do a LOT with this.
- As an alternative to the Sleepy pen, you can ask the warden for a Lethal injection syringe, empty it into a beaker, then get Nitrile Gloves, with those gloves, you will be able to inject someone with any toxin mix you want before they get up from being shoved twice against the wall.
- Create an unstabilized phlogiston factory in-front of the Brig or inside of it to force Security to use lethal force on anyone they arrest since doing this will cause a massive and never-ending plasma fire.
- If you break into sec checkpoints, throwing Condensed Capsaicin-filled booze bottles you get from the Bartender can prove as an easy setup to turn someone into giblets with a remote, instant explosive. Throw/Smash, shove, throw and detonate with a Remote Signaling Device.
- As an alternative to the last tip's condensed capsaicin booze bottles, you can use condensed capsaicin drinking glasses.
- Getting Botany to make apples with the "Densified Chems" trait and give them to you will allow you to inject a chemical war-crime mix into the apples. From there you can manipulate people into eating them or stun-lock them so you can feed them it, whether they like it or not.
- Put Anacea and potent toxins like Fluorosulfuric acid or Liquid N2O in a pill, patch, bubblegum or bluespace/lethal injection syringe to make a 3rd degree poison that can't be purged easily with a Multiver pill
Chemical-X
Chemistry is one of the jobs with the highest harmful potential. With some planning, you can make many different gimmicks as a traitor chemist. A LOT of the chemicals you have access to will kill when injected. Access to grenades is a plus. Search around or experiment for better "hellfoam" and "hellsmoke" mixes.
If you want to make something grand and spectacular though, consider crafting and learning how to use a chemical payload.
