Chemistry
Chemical substances, atomic structure, reactions, laboratory methods, and materials.
70 words
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Some words in this topic are A2–C2 — part of Pro. A1 words are always free.
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iron
B1
/æːn/
A common hard grey metal that rusts and is used to make steel
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alcohol
B1
/ˈæl.kə.hɔl/
Drinks such as beer, wine, and spirits that can make you drunk.
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reaction
B1
/ɹiˈækʃən/
The way you behave or feel because of something that has happened.
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oxygen
B1
/ˈɑk.sɪ.d͡ʒən/
A colourless, odourless gas that humans and animals need to breathe and that makes up part of the air.
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element
B1
/ˈɛləmənt/
One of the parts that together make up a whole.
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chemistry
B1
/ˈkɛm.ɪ.stɹi/
The science that studies what substances are made of and how they change.
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compound¹
B1
/ˈkɑmpaʊnd/
a substance made by combining two or more elements or ingredients
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laboratory
B1
/ˈlæb(ə)ɹəˌtɔɹi/
A room or building equipped for scientific research, experiments, or analysis.
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organic
B1
/ɔɹˈɡænɪk/
Grown or produced without artificial chemicals, fertilizers, or pesticides.
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concentration
B1
/ˌkɑn.sənˈtɹeɪ.ʃən/
the ability to give all your attention to something
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atomic
B1
/əˈtɑː.mɪk/
Relating to atoms, the tiny units that make up all matter.
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chemist
B1
/ˈkɛmɪst/
A scientist who studies or works with chemistry.
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molecular
B1
/məˈlɛk.jə.ləɹ/
relating to or produced by or consisting of molecules
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sodium
B1
/ˈsoʊ.di.əm/
Employing sodium.
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dioxide
B1
/daɪˈɑksaɪd/
A chemical compound that has two oxygen atoms in each molecule.
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nitrogen
B1
/ˈnaɪ.tɹə.d͡ʒən/
The chemical element with an atomic number of 7 and atomic weight of 14.0067. It is a colorless and odorless gas.
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dissolve
B1
/dɪˈzɑlv/
To mix into a liquid and become part of it.
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reduction
B1
/ɹɪˈdak.ʃən/
The act of making something smaller or less.
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calcium
B1
/ˈkæl.si.əm/
the chemical element with symbol Ca and atomic number 20, a soft, silvery, reactive alkaline-earth metal that occurs naturally only in compounds
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nucleus
B1
/ˈnuː.kli.əs/
The central part of an atom, made of protons and neutrons.
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electron
B1
/ɪˈlɛk.tɹɑn/
A tiny particle inside an atom that carries a negative electric charge.
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molecule
B1
/ˈmɑ.lɪ.kjul/
The smallest unit of a substance that still has all its chemical properties, made of two or more atoms joined together.
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oxide
B1
/ˈɑksaɪd/
a chemical compound of oxygen with another element
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chloride
B1
/ˈklɔːr.aɪd/
the negatively charged chlorine ion, Cl−, found in many salts and serving as an important electrolyte in body fluids
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inorganic
B1
/ɪnɔɹˈɡænɪk/
relating or belonging to the class of compounds not having a carbon basis
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