Chemistry English: Lab Vocabulary and a Self-Study Roadmap

You're holding the COA for a batch of solvent that just came into the warehouse. The sheet is written in English and you read almost all of it: appearance, assay, water content, residual solvent, the numbers sitting exactly where they should, the last line reading complies with specification. Your chemistry vocabulary isn't bad, since most of the terminology in this field is the same in every language and you've been reading it since your assignments back in university.

Then the supplier calls for a video chat to explain a strange peak on the chromatogram, or a customer calls back to ask why this batch's result came in so close to the limit. Thirty seconds go by, you catch the word impurity and the word batch, and the rest turns into one continuous stretch of sound. Every word is one you read every day — you've just never heard anyone say it out loud.

This article is written for exactly that gap. The vocabulary is arranged into four groups you actually touch in a single shift: equipment and procedures, compound names and nomenclature, COA sheets and QC language, and SDS documents with chemical labels. It comes with a safety instruction excerpt transcribed word for word so you can see exactly where your ear drops out, and a three-stage learning path for people already working.

• Where chemistry English gets hard
• Chemistry English vocabulary by group
• Listening to lab videos and safety instructions
• Common mistakes in the lab
• A learning path for lab workers
• FAQ on lab English

Where chemistry English gets hard

The odd thing about chemistry is that you get to know the written word before you get to know the spoken one. Titration, aqueous, precipitate — these words appear in their original form in your Vietnamese university textbooks, so your eyes recognize them right away. But the pronunciation you've built in your head is one you made up yourself, and it usually doesn't match how a native speaker actually says it.

First, Latin and Greek roots aren't pronounced the way they're spelled. Titration is /taɪˈtreɪʃn/, the first sound is "tai," not "ti." Anhydrous carries its stress on the second syllable. Reagent is /riˈeɪdʒənt/, not "rê-a-gen." You've been mispronouncing it in your head for ten years, so when you hear it said correctly, your ear doesn't recognize it as a word you already know.

Second, one substance has three names. The systematic IUPAC name, the common name the whole plant still uses, and the trade name printed on the drum. Propan-2-one, acetone, and the manufacturer's own brand name all refer to the same thing. On a call, the person on the other end uses whichever name is most convenient for them, and you have to match up all three names while they keep talking.

Third, abbreviations get spelled out letter by letter. SDS, COA, HPLC, GC, LOD, LOQ, OOS, CAPA, GHS, PPE. On paper they're distinct. Spoken aloud, they blur into a half-second burst of sound, and a sentence like "the OOS on that COA" goes by before you can pull it apart.

Fourth, two different registers sit side by side. A protocol is written in the imperative, short sentences, verb first: add, stir, allow to cool. An SDS is written in fixed legal phrasing, repeated almost word for word across every product from every manufacturer. Learn the SDS sentence patterns once and you can use them for every sheet after that — that's the single biggest bargain in this field.

Chemistry English vocabulary by group

The four tables below are arranged in the order you encounter them during a workday, not alphabetically. The example column is a sentence someone in the field actually writes or says, so you can borrow it as is.

Lab equipment and procedures

Compound names, nomenclature, and describing solutions

This group determines whether you can read a protocol fluently. You don't need to memorize IUPAC nomenclature, but you do need to be able to read it, because systematic names are what show up on analysis sheets and in papers.

COA sheets, analysis results, and QC language

This is the vocabulary set that keeps QC people going. A COA from any supplier repeats roughly these same twenty phrases, so once you've learned this group you can read almost any certificate.

SDS, chemical labels, and safety phrasing

A chemical safety data sheet has a fixed sixteen-section structure under the GHS system, and the US occupational safety agency describes exactly that structure in its Hazard Communication materials. The fixed structure is good news for a learner: section four is always first aid, section seven is always storage, section nine is always physical and chemical properties. Remember the section numbers and you can find the information even before you've finished reading the sentence.

Listening to lab videos and safety instructions

The four tables above are four lists. Read a list and by next week you'll remember about a third of it, and that third isn't necessarily the part you need. What actually sticks is a word you once misheard and then corrected yourself, because at that moment your brain records both the sound and the meaning in the same place.

The concrete method is dictation listening: open a short clip, listen sentence by sentence, transcribe it word for word, then check it against the original. Wherever you transcribe it wrong is exactly where your ear has a hole, and it repeats in patterns rather than at random. Take an ordinary sentence from the start of a shift as an example.

Before you start, make sure the fume hood sash is down to the marked line, and weigh out the solid inside the hood, not on the open bench.

Vietnamese listeners usually miss three spots in this sentence. Weigh out links into a cluster that sounds almost like "way out," and the meaning slides from "weigh out" to "exit." Sash is contracts to "sash's," dropping a whole syllable. Fume hood has the final consonant of "fume" run into the "h" of "hood," so the whole phrase collapses to two beats. All three spots belong to the phenomena of linking and elision, explained in detail in the article on connected speech.

The lab vocabulary set has a trap of its own too. Many terms you've only ever read, never heard, so you assign them a pronunciation of your own making based on Vietnamese. Aliquot gets pronounced "a-li-quốt," while a native speaker says /ˈælɪkwɒt/ with the stress on the first syllable and the last two nearly swallowed. Desiccator gets pronounced "đề-si-ca-tơ" with four even beats, when in reality only the first syllable stands out. When the pronunciation in your head is off like that, your ear can hear the word correctly and still not recognize it.

So start with material whose content you already understand: a video of a procedure you do every day, or a safety instruction clip for a chemical that's actually in your warehouse. Already knowing the content means your full attention goes to the sound. The WELE podcast library is organized by topic and comes with transcripts so you can grade yourself, and the six-step process is in the article five steps to effective dictation listening. If you're not sure what level you're at, try the listening level test before picking a difficulty.

Fifteen minutes a day with a thirty-second clip is enough, and how to fit that in for people working shifts is covered in the article learning English fifteen minutes a day.

Common mistakes in the lab

Calling every safety sheet an MSDS. MSDS is the old name. Since the GHS system was adopted, this document is called a Safety Data Sheet, abbreviated SDS, with a unified sixteen-section structure. Many plants in Vietnam are still used to calling it MSDS and listeners still understand, but when working with foreign partners, use SDS to stay current.

Confusing chemist with chemistry. Chemistry is the subject, chemist is the person who works in chemistry, and in Britain chemist also means pharmacy. The sentence "I went to the chemist" in London means going to buy medicine, not going to meet a chemist. This is close to the vocabulary set in the article pharmaceutical English.

Translating "solution" as a fix rather than a mixture. In the lab, solution almost always means a solution in the chemical sense. The sentence "prepare a fresh solution" means prepare a new dissolved mixture. Misread it once and you lose the whole next sentence.

Confusing assay with essay. The two words sound nearly alike, and one of them has no place whatsoever on a results sheet. Assay is the content value or the quantitative test — the number that decides whether a batch passes or not.

Using molar mass and molecular weight interchangeably. In everyday conversation people swap them freely, but when writing a report or answering an auditor, stick with whichever term your standard reference document uses, and keep it consistent throughout the document.

Mixing up the two warning words on a label. The GHS system uses two signal words, Danger for the more severe level and Warning for the milder one. Skim past these two words and shelve a chemical in the wrong cabinet, and that's a mistake with real consequences, not just a language slip.

Reading concentration and concentrated as the same word. Concentration is the degree of concentration, concentrated means strong/undiluted. The sentence "use concentrated sulfuric acid" and the sentence "check the concentration" call for two completely different actions.

A learning path for lab workers

In foreign materials, the English of this trade is usually called English for chemistry or chemical English, while the safety side falls under the name chemical safety. Knowing these names helps you find the right materials instead of getting lost on pages that just recopy vocabulary lists.

Someone already working only needs three stages, and you're almost certainly at the first one.

1. Stage one, read fluently through the paperwork already sitting on your desk. Each week, take the English SDS of a chemical actually in your warehouse, read all of section two and section four in full, and copy out the five hazard statements and precautionary statements that appear in it. After a few weeks you'll see these sentences repeat almost word for word across different products, and reading a new sheet will only take a few minutes.
2. Stage two, be able to follow procedures and safety instructions by ear. Each week, pick a roughly one-minute procedure video describing an operation you already know how to do, listen sentence by sentence and transcribe it, then pull up the transcript to check. Mark where you missed something and work out which pattern it belongs to: a final consonant, a contracted form, or an equipment name you've never heard spoken aloud.
3. Stage three, be able to speak with customers and auditors. Each week, record two minutes of yourself presenting a situation in English around three points: what happened, what we checked, and what the next step is. Listen back to the recording, mark where you hesitated, then re-record until you can say it smoothly without looking at notes.

For self-study resources, pick things that are both useful in the trade and give you real English, and favor sources that already have a transcript you can check against.

• PubChem (pubchem.ncbi.nlm.nih.gov): a free chemical database from the US National Institutes of Health. Every compound page has an IUPAC name computed by the system from the structure, plus a Safety and Hazards section with GHS warning statements, so you can read the standard name and the English safety phrasing for the exact substance in your hands.
• OSHA's Hazard Communication page (osha.gov/hazcom): the US occupational safety agency explains the sixteen-section structure of the SDS and the GHS label set, along with a summary QuickCard document. This is the place to learn the official English name of each section, the thing you'll hear people refer to by section number in every safety meeting.
• JoVE (jove.com): a peer-reviewed video journal of experimental methods, each article pairing a procedure video with a detailed written protocol on the same page, including a Chemistry section and a Science Education collection on lab safety. Listening to the narration and checking it against the written protocol is exactly the dictation exercise this field needs. A lot of the content requires an account through a university library, so check your access first.
• Chemistry World podcast (chemistryworld.com/podcasts): the podcast of Chemistry World magazine, published by the Royal Society of Chemistry, covering research and stories from chemistry. The speakers are people from the field, so you hear terminology pronounced correctly inside natural sentences rather than read out letter by letter. Not every episode has a transcript, so save this source for the later stage, once your ear has adjusted.

Pick whichever source you like, as long as you keep one habit: every week, have at least one clip you listen to sentence by sentence and transcribe on paper, instead of just half-listening while doing something else.

FAQ on lab English

What does chemistry-specific English cover?

Four areas, exactly the four tables in this article. Equipment and procedures for reading protocols, nomenclature for naming substances correctly, QC language for reading COAs and writing reports, and safety phrasing for reading SDS documents and labels. Students are usually strong on nomenclature and weak on the other three areas; people already working tend to be the opposite.

How is MSDS different from SDS?

Both are chemical safety sheets; they differ in era and structure. MSDS is the older name, with a format that wasn't standardized across countries. SDS is the current name under the GHS system, with sixteen fixed sections in a fixed order. In everyday work in Vietnam you'll hear both, but the new documents from international suppliers all say Safety Data Sheet.

Do you need to memorize IUPAC nomenclature?

You don't need to memorize it well enough to name compounds yourself, but you do need to be able to read it. What you actually do is look at a systematic name on a sheet and know which substance in the warehouse it corresponds to. For that you just need a handle on the parent chain, the functional group, and the locants, plus the habit of looking up the IUPAC name of the substances you use regularly.

I read documents fine but can't keep up with lab videos — where do I start?

Start with transcribing, and start with content you already understand. Pick a thirty-second clip describing a familiar procedure, listen sentence by sentence, transcribe it word for word, then check it against the original. Keep it up for two weeks straight and you'll see the errors repeat in patterns, usually final consonants and unstressed function words. The article why Vietnamese listeners struggle goes into more detail on these error patterns.

Is learning chemistry vocabulary with flashcards enough?

Enough to recognize the word on paper, not enough to hear it. Flashcards teach you the word-and-meaning pair, but what you're missing on a call is the sound of that word inside a fast-moving sentence. The fix is to attach each word to a real sentence and listen to that sentence — the reasoning is in the article learning vocabulary in context. To find out how wide your current vocabulary actually is, take the vocabulary test.

Which vocabulary group should chemistry students who aren't working yet learn first?

The equipment and procedures group, because that's what you use right away in lab sessions and in your thesis. Save the COA and QC group for when you go on internship, when you'll have real sheets in hand and the vocabulary is attached to something concrete, so it sticks far faster.

The chemistry vocabulary set is long, and trying to memorize all four tables in one week leaves very little left the week after. The more durable approach is to take one real sheet and one short listening clip each week, transcribe it, then correct it. If you also work across other departments or are considering a move, the vocabulary maps for other trades all live in one place in the article specialized English, from medicine to insurance.