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1A compound with particular chemical properties including turning litmus blue and neutralizing or effervescing with acids; typically, a caustic or corrosive substance of this kind such as lime or soda.‘flint is not subject to chemical weathering except by strong alkalis’mass noun ‘the reaction is followed by measuring the concentration of alkali at various times’
caustic, corroding, eroding, erosive, abrasive, biting, mordant, burning, stingingView synonyms
- ‘Platinum also dissolves in hot alkalis such as hot sodium hydroxide or potassium hydroxide.’
- ‘Corrosives (mineral acids, alkalis, phenols) are in this category.’
- ‘Concentrated acids and caustic alkalis should be handled with the greatest care.’
- ‘Amides are hydrolysed to ammonium salts with catalysis by acids or alkalis.’
- ‘It combines with most non-metals at high temperatures and reacts with both acids and alkalis.’
- ‘On contact, strong acids, alkalis, and heavy metals cause chemical burns.’
- ‘Carboxylic acids also react with alkalis, or bases.’
- ‘Like semi-permanent dyes, permanent dyes are also alkalis.’
- ‘Nickel has good resistance to corrosion in the normal atmosphere, in natural freshwaters and in deaerated nonoxidizing acids, and it has excellent resistance to corrosion by caustic alkalis…’
- ‘It can withstand high temperatures and is resistant to many corrosive substances such as acids and alkalis.’
- ‘Zinc is a fairly active metal that dissolves in both acids and strong alkalis.’
- ‘The high-density overlay protects the wood substrate from alkalis and water.’
- ‘Tellurium reacts with both acids and some alkalis.’
- ‘Soap is made by combining a fat source (either animal or vegetable) and an alkali in a chemical process known as saponification.’
- ‘Copper is a moderately reactive metal that dissolves in most acids and alkalis.’
- ‘Chemically, aluminum will react with the alkalis in concrete and produce hydrogen bubbles.’
- ‘Caustic alkalis react with the paint coating and loosen it from the surface.’
- ‘Nitriles can be decomposed by acids or alkalis to give the corresponding carboxylic acid or they can be reduced to give primary amines.’
- ‘It accounted for acids and alkalis, for respiration and the smells of plants.’
- ‘They resist most chemicals, including many acids, alkalis, oxidizing agents, and solvents.’
- 1.1North American as modifier Alkaline.
- ‘What little grass they found was encrusted with alkali soil, which only exacerbated the animals' thirst.’
- ‘The hydrothermal fluid introduced only small amounts of water and alkali elements (such as sodium and potassium).’
- ‘On the stone soil, the whip antenna's efficiency is reduced 1.5-2.5 times (as compared to white alkali soil surfaces).’
- ‘Those from the Yidun Terrane mostly lie in the field of alkali basalts.’
- ‘You can't drink the water, but brine shrimp and alkali flies prosper in a mineral-rich California lake’
- ‘The dominant magma types are basalts and hawaiites, with lesser amounts of trachytes, quartz trachytes, alkali rhyolites and phonolites.’
- ‘Therefore, it is important that the high and low NHE3 groups do not differ with respect to daily food intake or dietary alkali load.’
- ‘Therefore, a relatively short period of alkali treatment was chosen.’
- ‘Many such dikes in western Maine are classified as alkali diabase.’
- ‘This is especially crucial to document in alkali injuries.’
- ‘These smaller volumes of melt are rich in elements such as sodium and potassium (alkali metals), which are the first elements to move into the melt; the resulting rocks are called alkali basalts.’
- ‘Additionally, clinically, if CO2 tensions venture into the range of 80-100 mm Hg in critically patients, the use of alkali therapy is generally mandatory.’
- ‘Femenia et al. reported the presence of such complexes in alkali extracts from lignified cauliflower stems.’
- ‘Transformation of S. pombe was performed by treatment of cells with alkali cations.’
- ‘For the first few days, the country presented picturesque timbered bottomlands and rolling prairie, but slowly it changed to a rocky landscape littered with buffalo bones and stagnant pools of undrinkable alkali water.’
- ‘He watches flies crawl onto heat-softened flypaper and wave their gummy limbs in torturous gestures toward escape, captive, his mother suggests, as she and he are on this alkali flat.’
- ‘He disputes Lafarge's claim that ‘rogue employees’ were responsible for misreporting alkali levels in cement between September 2002 and December 2004.’
- ‘Oceanic island rocks form two major families based on mineralogy and petrography: those that form from tholeiitic basalts and those from alkali basalts.’
- ‘A vast white alkali flat unrolled across the field of his dream, ringed with serrated purple mountains at the horizon.’
- ‘Also, Triassic rift-related alkali basalts are exposed in the adjacent Kocacli basin.’
Late Middle English (denoting a saline substance derived from the ashes of various plants, including glasswort): from medieval Latin, from Arabic al-qalī ‘calcined ashes (of the glasswort etc.)’, from qalā ‘fry, roast’.
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