▸ Specimen Drawer
Materials & Substances — Lesson 11
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ammonia
əˈmoʊniə
A water solution of ammonia — the ammonia smell was very strong in the lab.
Ammonia is commonly used in household cleaning products.
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aniline
ˈænəlɪn
A toxic organic compound (C₆H₅NH₂) consisting of a benzene ring with an amino — the experiment requires a small amount of aniline dissolved in ethanol.
Aniline is an important intermediate in the production of many synthetic dyes.
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anthracite
ˈænθrəsaɪt
A hard natural coal that burns slowly and gives intense heat — many factories use anthracite as fuel for their boilers.
Anthracite burns with a clean flame and produces very little smoke.
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antibodies
ˌæntaɪˈbɑːdɪz
Proteins produced by the immune system that identify and neutralize harmful — blood tests can detect specific antibodies.
The body produces antibodies to fight infections.
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antifreeze
ˈænti.friːz
A liquid added to the water in a cooling system to lower its freezing point — the mechanic added antifreeze to the car's radiator.
Remember to check the antifreeze level before winter arrives.
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antigen
ˈæntədʒən
A substance, usually a protein, that enters the body and causes the immune — the vaccine contains a weakened form of the antigen to stimulate immunity.
The vaccine contains a weakened form of the antigen to stimulate immunity.
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antigens
ˈæntɪdʒənz
Substances, usually proteins, on the surface of cells, viruses, fungi, or — antigens trigger the immune system to produce specific antibodies.
The vaccine contains weakened antigens that help the body build immunity.
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antiknock
ˌæntiˈnɑːk
Any of various compounds that are added to gasoline to reduce engine knocking — modern engines require fuel with good antiknock properties.
Lead was once commonly used as an antiknock additive in gasoline.
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antimatter
ˌæntiˈmætər
A substance composed of antiparticles, which have the same mass as ordinary — antimatter is extremely rare in our universe.
Antimatter is the mirror image of ordinary matter.
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antimony
ˈæntɪmoʊni
A brittle, silvery-white metalloid element with the atomic number 51, used in — antimony is often alloyed with lead to make it harder.
Antimony is often alloyed with lead to make it harder.
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antioxidant
ˌæntiˈɑksɪdənt
A substance that prevents or slows damage to cells caused by free radicals — blueberries are rich in antioxidants.
Blueberries are rich in antioxidants.
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aquamarine
ˌækwəməˈriːn
A transparent variety of beryl that is blue green in color — her eyes were the color of aquamarine.
Her eyes were the color of aquamarine.
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▸ Catalogue Progress
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specimens catalogued
Mark each specimen as learned to complete this drawer.